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DRIVE SYSTEM

1. a protective cap on the hydraulic line and on the hydraulic fitting Fig 1517 DSC 0884 Fig 1515 DSC 0883 21 Carefully remove the hydrostatic pump by lowering it toward the battery compartment area and out of the 19 Remove the hydraulic hose on the front hydraulic unit Fig 1518 fitting of the loader valve Fig 1516 Install a protect ive cap on the hydraulic line and on the hydraulic fitting Fig 1518 DSC 0887 Fig 1516 DSC 0885 22 To service the hydrostatic pump refer to the Hydro Gear BDP 10A 16A 21L Service and Repair Manual Toro form no 492 4789 or the Hydro Gear P Series Pumps Service and Repair Manual Form no BLN 52503 TX420 TX425 Series Service Manual Rev 001 8 103 DRIVE SYSTEM Hydrostatic Pump Right Side Installation 2 Maneuver the right side hydrostatic pump up into the loader tower assembly Loosely install using 2 bolts and nuts to the tower assembly DO NOT tighten the bolts and nuts at this time Fig 1520 As a reminder prior to connecting the hydraulic lines the o rings should be replaced with new ones and lightly lubricated with oil 1 When installing a new hydrostatic pump make sure all the fittings are installed properly Fig 1519 Fig 1520 DSC 0889 Note Remove the protective caps prior to each line ee lia being connected o z hdc E 3 Connect the two hydraulic lines to the tee fitting located on top of the hydrostatic pump and ti
2. pulley hub and pulley Tighten them until the bushing breaks free from the pulley Fig 1504 Fig 1506 DSC 0829 Fig 1504 CLR DSC 0865 8 Remove the right hand panel by removing 4 screws Fig 1507 6 Carefully remove the hub and the pulley Fig 1505 Note While removing the hub and pulley be careful not to lose the key that goes onto the pump shaft Fig 1507 CLR DSC 0843 Fig 1505 CLR DSC 0866 8 100 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 9 Open the rear access door 12 Tag or mark the right side hydraulic line so when you re install the hydraulic line the correct one 10 Disconnect the negative and then the positive will be connected to the right port of the hydraulic battery cable Remove the battery bracket clamp Tilt pump Remove the right hand hydraulic hose from the battery to remove it from the unit the bottom of the hydrostatic pump with a 15 16 15 60 offset open end wrench Fig 1509 Place 11 Remove the bolt and nut retaining the control linkage a protective cap on the hose and on the hydraulic to the pump lever assembly Fig 1508 fitting on the hydrostatic pump Fig 1508 CLR DSC 0868 Fig 1509 DSC 0870 13 Remove the left side hydraulic hose from the bottom of the hydrostatic pump using a 15 16 15 60 offset open end wrench Fig 1510 Place a protective cap on the hose and the hydraulic fitting on the hydro static pump Fig 1510 DSC 0878 TX420 T
3. 2 Loosely install the lower bolt and nut with the head 5 Using a 15 16 wrench connect the left hand of the bolt toward the engine hydrostatic pump lines as follows A Hydraulic oil inlet from the filter Fig 1444 3 Carefully position the pump into the battery box location and then up into position in the tower assembly Fig 1442 Fig 1444 PICT 1463a Fig 1442 PICT 1482 TX420 TX425 Series Service Manual Rev 001 8 83 DRIVE SYSTEM B Right pump case drain hose Fig 1445 6 Using a 1 2 socket and wrench install the nut and bolt to secure the steering linkage to the pump Note A 7 8 wrench may need to be used to hold control arm Fig 1447 the fitting while tightening the hydraulic line Note Ensure the case drain line marked with the letter C is not rubbing on the control linkage Fig 1445 PICT 1485 Fig 1447 PICT 1485 C Case drain line returning to the hydraulic oil tank Fig 1446 7 Using a 1 1 8 wrench connect the remaining hydro static pump lines just marked as follows D Hydraulic hose running from the D port on the hydrostatic pump to the upper fitting on the right wheel motor Fig 1448 Fig 1446 PICT 1465 Fig 1448 PICT 1486 8 84 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM E Hydraulic hose running from the E port on the 8 Using a 3 4 wrench and socket with a swivel or hydrostatic pump to the lower fitting on the right univ
4. Fig 1190 DSC 0646 Fig 1192 PICT 0530 TX420 TX425 Series Service Manual Rev 001 8 17 DRIVE SYSTEM 5 Install the first washer and then the outer tension 6 Insert the notched end of the alignment tool into the wheel Install the second washer and then the nut drive wheel spacer Fig 1195 and snug the nut up Fig 1193 Fig 1195 DSC 0650 Fig 1193 DSC 0648 7 Secure the end with the pin Fig 1196 Alignment Tool Toro P N 110 0069 Fig 1194 Fig 1196 DSC 0651 Fig 1194 CLR DSC 0624 8 18 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 8 Rotate the tool and move the track guide as neces TX425 sary until the tool fits into the track guide channel Secure the end of the tool with a strap Fig 1197 Track Installation Important Align the track guide Refer to Track Guide Alignment on page 8 115 1 Remove the nut two washers and the front outer tension wheel Fig 1199 Fig 1197 DSC 0653 9 Tighten and torque the 4 track guide mounting bolts to 75 ft lbs 102 Nm Fig 1198 Fig 1199 DSC 0655 2 Install the track ensuring that the lugs in the track fit between the spacers in the middle of the drive sprocket Fig 1200 Fig 1198 DSC 0654 10 Remove the alignment tool Fig 1200 DSC 0656 TX420 TX425 Series Service Manual Rev 001 8 19 DRIVE SYSTEM 3 Push the tension wheel toward the drive sprocket 5 Torque the nut to 300 ft lbs 407 Nm Fig 1203
5. 1552 1551 Fig 1552 CLR DSC 0624 Fig 1551 CLR DSC 0821 TX420 Track Guide Alignment 1 Ensure the 4 track guide mounting bolts are loose To align the track guide the machine must be raised off Fig 1553 the ground and the tracks removed from the machine Refer to e Lifting Unit for Service on page 8 2 e Track Removal on page 8 4 TX420 or on page 8 13 TX425 Fig 1553 DSC 0617 TX420 TX425 Series Service Manual Rev 001 8 113 DRIVE SYSTEM 2 Insert the notched end of the alignment tool into the 4 Rotate the alignment tool and move the track guide drive wheel spacer Fig 1554 as necessary until the alignment tool fits into the track guide channel Secure the end of the alignment tool with a strap Fig 1556 Fig 1554 DSC 0625 Fig 1556 DSC 0629 3 Secure the end of the alignment tool with the align ment tool pin Fig 1555 5 Tighten and torque the 4 track guide mounting bolts to 75 ft lbs 102 Nm Fig 1557 Fig 1555 DSC 0628 Fig 1557 DSC 0631 8 114 Rev 001 TX420 TX425 Series Service Manual 6 Remove the alignment tool 7 Install the track Refer to Track Installation on page 8 4 TX420 TX425 Note The TX425 220000100 220000400 has 5 track guide mounting bolts and the TX425 22000401 amp higher has 4 track guide mounting bolts 1 Install a washer and then the outer tension wheel Install a washer and a nut securing the tension wheel to th
6. Fig left hand panel to the control panel assembly Fig 1402 1404 Fig 1402 PICT 1413 Fig 1404 PICT 1415 16 Install the left hand panel from the control panel 18 Install the right hand panel from the control panel assembly Fig 1403 assembly Fig 1405 Fig 1403 PICT 1416 Fig 1405 PICT 1414a TX420 TX425 Series Service Manual Rev 001 8 73 DRIVE SYSTEM 19 Using a 3 8 socket install 4 screws to secure the Hydrostatic Pump Removal Left Side right panel to the control panel assembly Fig 1406 1 Raise the machine Refer to Lifting Unit for Service on page 8 2 Removal of Rear Panels 1 Remove the rear access cover Fig 1408 Fig 1406 PICT 1413 20 Start the engine set the park brake e Cycle loader valve to raise and lower lift and tilt cylinders e Stroke the drive handle forward and back until the track drive is smooth and consistent e Check for leaks Fig 1408 PICT 1026 21 Install rear cover Fig 1407 2 Using a 1 2 socket and wrench remove the battery clamp Fig 1409 Fig 1407 PICT 1026 Fig 1409 PICT 1029a 8 74 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 3 Disconnect the negative battery cable and then the 5 Using a 3 8 socket remove the right hand and left positive battery cable Fig 1410 hand rear cover support assemblies Fig 1412 Fig 1410 PICT 1032a Fig 1412 PICT 1037 4 Remove the battery from the battery mount
7. and install the track around the inner tension wheel Fig 1201 Fig 1203 DSC 0660a Fig 1201 DSC 0657 6 Turn the tensioning screw counterclockwise until the distance between the tension nut and the back 4 Apply grease to the inner and outer washer for the tension tube is 2 3 4 7cm Fig 1204 and Fig outer tension wheel Install the inner washer tension 1205 wheel outer washer and nut Fig 1202 Fig 1204 DSC 0661 Fig 1202 DSC 0658 8 20 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM TX420 240000100 amp higher TX425 240000300 amp higher Wheel Motor Removal Note This procedure can be used for the left or right wheel motor 1 Lift and securely support the unit Refer to Lifting IK hy Rover Unit for Service on page 8 2 i ff iy fi Lh LAAN Abhi 2 Remove the track Refer to Track Removal as follows e TX420 page 8 4 e TX425 with cast drive wheel page 8 13 Fig 1205 fig 33 m 4775 e TX425 with drive sprocket wheel 8 29 A 2 3 4 inches 7cm 3 Set the park brake With a 1 3 4 socket remove the nut on the drive sprocket Fig 1207 Note The nut retaining the drive sprocket is a 7 Align the closest notch in the tension screw to the patch lock nut and needs to be replaced locking bolt and secure the screw with the locking whenever removed bolt and nut Fig 1206 Fig 1207 DSC 0664 Fig 1206 DSC 0662 8 Lower the traction unit to the
8. and the front tension wheel Fig 1174 DSC 0609 8 12 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 3 Turn the tensioning screw counterclockwise until 4 Align the closest notch in the tension screw to the the distance between the tension nut and the back locking bolt hole and secure the screw with the tension tube is 2 3 4 7cm Fig 1175 and Fig locking bolt and nut Fig 1177 1176 Fig 1177 DSC 0606 Fig 1175 DSC 0607 TX425 Track Removal 1 Raise and secure the unit off the ground Follow the procedures for Lifting Unit for Service page 8 2 mm Fig 1176 fig 33 m 4775 A 2 3 4 inches 7cm TX420 TX425 Series Service Manual Rev 001 8 13 DRIVE SYSTEM 2 Remove the bolt and nut securing the tensioner bolt Fig 1178 Note Serial number 250000399 and below may have square tensioner arms Fig 1180 fig 35 m 4747 A Locking bolt C Tension tube B Tensioning screw D Tension wheel Fig 1178 DSC 0636 2 4 Using a 1 7 16 socket remove the nut and washer from the outer tension wheel Fig 1181 3 Using a 1 2 drive ratchet release the drive tension by turning the tensioner bolt clockwise until the ten sioning nut contacts the tensioner bolt head Push the tension wheel toward the rear of the unit Fig 1179 and Fig 1180 Fig 1181 DSC 0638 Fig 1179 DSC 0637 8 14 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 5 Remove
9. cover by removing the 8 sets of fasteners Fig 1366 Note Use a floor jack to raise the machine off the jack stands to remove the rear chassis cover from the machine Lower the machine back onto the jack stands Fig 1364 PICT 1037 6 Using a 3 4 socket remove both rear counter weights Fig 1365 Fig 1366 PICT 7636 8 Disconnect the two wires on the fuel sending unit located on top of the fuel tank Fig 1367 Fig 1365 PICT 7633 Fig 1367 PIC T 0555 A Center terminal B Outside terminal orange wire black wire TX420 TX425 Series Service Manual Rev 001 8 63 DRIVE SYSTEM 9 Remove the fuel line from the fuel tank Slide the 11 Remove the right hand panel from the control panel fuel tank out of the frame Fig 1368 assembly Fig 1370 Fig 1368 PICT 7638 Fig 1370 PICT 1414a 10 Using a 3 8 socket remove the 4 screws holding 12 Using a 3 8 socket remove the 4 screws holding the right hand panel to the control panel assembly the left hand panel to the control panel assembly Fig 1369 Fig 1371 Fig 1369 PICT 1413 Fig 1371 PICT 1415 8 64 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 13 Remove the left hand panel from the control panel B Inlet line from the hydraulic oil filter Fig 1374 assembly Fig 1372 Fig 1374 PICT 1419 Fig 1372 PICT 1416 C Case drain line Fig 1375 Marking the Right Hand Hydrostatic Pump Lines 1 Mark the hydrostatic
10. frame Fig 1246 TX425 220000001 220999999 Track Guide Installation 1 Remove the tensioner arm for easier access to the inner bolts Fig 1248 Fig 1246 DSC 0711 Note If you have plastic road wheels the inner bearings can not be replaced The complete road wheel with bearings have to be replaced rig iaas DSC 0713 Note To remove the carriage bolts that hold the track guide clamp remove the 3rd and 4th road wheels Fig 1247 2 Loosely install 2 bolts on the inside track guide Fig 1249 Fig 1247 DSC 0721 Fig 1249 DSC 0710 8 32 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 3 Loosely install the track guide clamp and loosely TX425 220000001 220999999 install 3 nuts to the 3 carriage bolts Fig 1250 Tensioner Arm Bearing Replacement Note Remove the track Refer to Track Removal on page 8 29 1 Remove the tensioner assembly out of the frame Fig 1252 Fig 1250 DSC 0709 4 Follow the procedures for track alignment using the track alignment tool refer to Track Guide Alignment on page 8 115 Fig 1252 DSC 0719 5 Once the track is aligned tighten and torque the track guide clamp bolts and nuts to 75 ft lbs 102 Nm Fig 1251 2 Check the tensioner wheel bolt to make sure it is straight and round Not worn or bent Fig 1253 Fig 1251 DSC 0715 l Fig 1253 CLR DSC 0720 6 Install tensioner wheel assembly TX420 TX425 Series Service Manual
11. just marked as right side pump to the lower fitting on the left follows wheel motor Fig 1432 D Hydraulic hose running from the D port on the pump to the upper fitting on the right wheel Note Cap all hydraulic lines and fittings to prevent motor Fig 1430 debris from entering system Fig 1430 PICT 1466 Fig 1432 PICT 1483 E Hydraulic hose running from the E port on the 4 Using a 1 2 socket and wrench remove the nut and hydrostatic pump to the lower fitting on the right bolt securing the steering linkage to the left hand wheel motor Fig 1431 pump control arm Fig 1433 Fig 1431 PICT 1468 Fig 1433 PICT 1471 8 80 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 5 Open the hood and prop it up in place with the hood 8 Remove the belt from the pulleys Fig 1436 support rod 6 Using a spring removal tool Toro P N 92 5771 connect the tool to the spring end located on the stud bolted to the tower assembly Pull up on the spring end to remove the spring from the bolt stud Fig 1434 Fig 1436 PICT 1442 9 Secure the left hand pulley and using a 5 8 socket remove the nut and washer securing the pulley to the left hydrostatic pump Fig 1437 Fig 1434 PICT 1439 7 Remove spring from the idler arm Fig 1435 Fig 1437 PICT 1472 Fig 1435 PICT 1441 TX420 TX425 Series Service Manual Rev 001 8 81 DRIVE SYSTEM 10 Using a 2 jaw puller remove the left pulle
12. pump lines as follows A Inlet line from the left hand hydrostatic pump Fig 1373 Fig 1375 PICT 1424a Fig 1373 PICT 1417 TX420 TX425 Series Service Manual Rev 001 8 65 DRIVE SYSTEM D Hydraulic hose running from the D port on the B Inlet line from the hydraulic oil filter Fig 1378 right hydrostatic pump to the upper fitting on the left wheel motor Fig 1376 E Hydraulic hose running from the E port on the hydrostatic pump to the lower fitting on the left wheel motor Fig 1376 Fig 1378 PICT 1429 C Case drain line Fig 1379 Fig 1376 PICT 1427a 2 Using a 15 16 wrench disconnect the right hand hydrostatic pump lines just marked as follows A Inlet line from the left hand hydrostatic pump Fig 1377 Note Cap all hydraulic lines and fittings to prevent debris from entering system Fig 1379 PICT 1430 Fig 1377 PICT 1428 8 66 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM D Hydraulic hose running from the D port on the 4 Open the hood and prop it up in place with the hood right hand hydrostatic pump to the upper fitting support rod on the left wheel motor Fig 1380 5 Using a spring removal tool Toro P N 92 5771 E Hydraulic hose running from the E port on the connect the tool to the spring end located on the hydrostatic pump to the lower fitting on the left stud bolted to the tower assembly Pull up on the wheel motor Fig 13
13. running to the wheel motor Install protective caps on the hydraulic lines and the wheel motor fittings Fig 1216 Fig 1218 DSC 0680 Fig 1216 DSC 0679 15 Rotate the wheel motor 90 so the hydraulic line ports are facing upward this will allow the raised portion of the wheel motor to fit through the notch in 13 Using a 1 1 16 socket remove the two hydraulic the frame Fig 1219 fittings on the wheel motor Fig 1217 Note Protective caps removed Fig 1219 DSC 0684 Fig 1217 DSC 0682 16 To service the wheel motor Refer to Parker Ross Wheel Motor Service Manual Toro form no 492 4753 8 24 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM Wheel Motor Installation 3 Install the wheel motor mounting plates on the inside of the frame Apply a thread locking compound to the threads of the bolts Fig 1222 Note Cap all lines and fittings to prevent debris from entering system 1 Wheel motor mounting plates have a wide side and narrow side The wide side faces up when installing the wheel motor Fig 1220 Fig 1222 DSC 0688 4 Install the 4 bolts and lockwashers through the motor Fig 1220 CLR DSC 0686 housing frame and into the wheel motor mounting plates Torque the bolts to 75 8 ft lbs 102 11 A Wide side B Narrow Side Nm Fig 1223 Note Remove protective caps Before installing the hydraulic fittings replace the o rings 2 Insert the wheel motor in
14. should be replaced with new ones and lightly lubricated with oil 1 When installing a new hydrostatic pump make sure all the fittings are installed properly Fig 1481 Fig 1481 CLR DSC 0852 C Wheel motor 2 B Case Drain D Pump bypass 8 93 DRIVE SYSTEM 2 Maneuver the left drive hydrostatic pump up into the 4 Connect the top hydraulic line located on top of the loader tower assembly Install with 2 bolts and nuts hydrostatic pump and tighten using a 15 16 open to the tower assembly DO NOT tighten the bolts and end wrench Fig 1484 nuts at this time Fig 1482 A WARNING Fig 1484 CLR DSC 0845 Fig 1482 DSC 0855 5 Install and tighten the hydraulic hose going to the 3 Connect the hydraulic return line to the auxiliary T fitting located on the right side of hydrostatic pump valve and tighten the connection with a 1 1 8 open using a 15 16 open end wrench Fig 1485 end wrench Fig 1483 Note Remove protective fitting caps prior to each line being connected Fig 1485 CLR DSC 0841 Fig 1483 DSC 0847 8 94 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 6 Tighten the hydraulic line nut located on the metal 8 Install the hydraulic hose unmarked to the left hydraulic line to the right hydrostatic pump using a hydraulic fitting located on the bottom left side of 15 16 open end wrench Fig 1486 the hydrostatic pump Tighten with a 1 1 8 15 60 offset open end
15. the frame Torque the bolts to the proper fitting Tighten the hydraulic lines using a 30 ft lbs 40 67 Nm Fig 1288 1 1 8 15 60 offset open end wrench Fig 1290 Fig 1288 DSC 0925 Fig 1290 DSC 0766 Note Before installing the hydraulic fittings replace Note Before installing the fuel tank connect the the O rings fuel line make sure the park brake is still disengaged and start the unit Follow the 7 Remove the plugs in the hydraulic fitting holes With procedures for purging refer to Purging Air a 1 1 16 socket install the hydraulic fittings to the Procedures on page 12 27 Check for any wheel motor Fig 1289 leaks in the hydraulic fittings and hydraulic hoses 9 Slide the fuel tank into the frame and install the fuel line and hose clamp Fig 1291 Fig 1289 DSC 0782 Fig 1291 DSC 0763 TX420 TX425 Series Service Manual Rev 001 8 43 DRIVE SYSTEM 10 Install the two wires on the fuel sending unit located 12 At the top left of the rear chassis cover assembly on the top of the fuel tank Fig 1292 install the fuel tank clamp with carriage bolt and nut Fig 1294 Fig 1292 DSC 0898 Fig 1294 DSC 0752 A Center terminal B Outside terminal orange wire black wire 13 Install the remaining eight bolts retaining the rear chassis cover assembly to the frame Fig 1295 11 Install the rear chassis cover assembly Fig 1293 Fig 1295 DSC 0896 Fig 1293 DSC 0897 8 44 Rev
16. the outer tension wheel and second washer 7 Remove the track from the rear drive sprocket Fig Fig 1182 1184 Fig 1182 DSC 0639 Fig 1184 DSC 0641 6 Remove the track from the front inner tension wheel TX425 220000401 amp higher Fig 1183 Track Guide Removal 1 Raise and securely support the unit Refer to Lifting Unit for Service on page 8 2 2 Remove the track Refer to Track Removal on page 8 13 Fig 1183 DSC 0640 TX420 TX425 Series Service Manual Rev 001 8 15 DRIVE SYSTEM 3 Install a hydraulic floor jack and a suitable board 5 Lower the track guide from the frame Fig 1187 under the track guide Fig 1185 Fig 1187 DSC 0645 Fig 1185 DSC 0642 l TX425 220000401 amp higher 4 Remove the 4 bolts holding the track guide to the Mame ASE Track Guide Installation 1 With a hydraulic floor jack and a board to support the track guide raise the track guide up to the frame Fig 1188 Fig 1186 DSC 0643 Fig 1188 DSC 0645 8 16 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 2 Remove the tensioner arm for easier access to the 3 Install the 4 bolts that hold the track guide to the inner bolts Fig 1189 frame Leave the bolts loose do not tighten Fig 1191 Fig 1189 DSC 0647 Fig 1191 PICT 0532 Note The track guide end with a step is mounted toward the drive sprocket Fig 1190 4 Install the tensioner arm back into the frame Fig 1192
17. through the rod end bearing Fig 1354 Fig 1356 CLR DSC 3662 Fig 1354 DSC 3667 8 60 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 6 Install the reference bar and the control handle as 8 Install the bolt and nut retaining the control handle sembly The control handle assembly should fit over assembly to the drive rod assembly Fig 1359 the drive rod assembly Fig 1357 Fig 1359 DSC 3658 Fig 1357 DSC 3660 9 Close the rear cover assembly 7 Install the 4 screws securing the reference bar to the control panel assembly Fig 1358 TX420 amp 425 240000301 amp up Hydrostatic Pump Removal Right Side 1 Raise the machine Refer to Lifting Unit for Service on page 8 2 Fig 1358 DSC 3659 TX420 TX425 Series Service Manual Rev 001 8 61 DRIVE SYSTEM Removal of Rear Panels 3 Disconnect the negative battery cable and then the positive battery cable Fig 1362 1 Remove the rear access cover Fig 1360 Fig 1362 PICT 1032a Fig 1360 PICT 1026 4 Remove the battery from the battery mounting tray 2 Using a 1 2 socket and 1 2 wrench remove the Fig 1363 battery clamp Fig 1361 Fig 1363 PICT 1034a Fig 1361 PICT 1029a 8 62 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 5 Using a 3 8 socket remove the right hand and left 7 Using a 3 4 and a 9 16 socket remove the rear hand rear cover support assemblies Fig 1364 chassis
18. to fit the wheel motor shaft Once the rear wheel drive sprocket has been removed it will not fit on the wheel motor shaft properly 1 Loosen the 11 hex head bolts retaining the outer drive wheel ring to the drive wheel Fig 1301 Fig 1299 DSC 0798 Fig 1301 CLR DSC 0783 8 46 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 2 Remove the wheel hex head bolts drive wheel 4 Discard the old center hub Install a new center hub spacers and the outer drive wheel ring Fig 1302 in the drive wheel assembly Turn the drive wheel assembly until all the inner and outer bolt holes line up Install the 4 bolts and nuts in the center hub Do Not Tighten Fig 1304 Fig 1302 CLR DSC 0784 Fig 1304 CLR DSC 0790 3 Remove the 4 bolts and nuts retaining the center hub to the drive wheel assembly Fig 1303 5 Assemble the outer drive wheel ring to the sprocket with the 11 spacers and hex head bolts Fig 1305 Fig 1303 CLR DSC 0785 Fig 1305 CLR DSC 0793 TX420 TX425 Series Service Manual Rev 001 8 47 DRIVE SYSTEM 6 Torque the 4 bolts and nuts in the center wheel hub 8 Install the crown nut on the motor shaft Fig 1308 to 70 ft lbs 94 9 Nm and the 11 hex head bolts to 125 ft lbs 169 5 Nm Fig 1306 Fig 1308 DSC 0797 Fig 1306 CLR DSC 0794 9 Torque the crown nut to 300 ft lbs 406 74 Nm Fig 1309 7 Install the drive wheel sprocket to the motor shaft Fig 1307
19. wrench Fig 1488 Fig 1486 DSC 0844 Fig 1488 DSC 0840 7 Install the hydraulic hose to the T fitting located on the right side of the left hydrostatic pump Fig 1487 9 Install the hydraulic line the line that is tagged or marked to the right hydraulic fitting located on the Note When connecting this hose make sure there bottom right side of the hydrostatic pump Tighten is enough clearance on the right side of the with a 1 1 8 15 60 offset open end wrench Fig hose for the control linkage 1489 Fig 1487 CLR DSC 0841 Fig 1489 DSC 0877 TX420 TX425 Series Service Manual Rev 001 8 95 DRIVE SYSTEM 10 Tighten the two pump mounting bolts and nuts to the 12 Install the pulley key in the hydrostatic pump shaft tower assembly Fig 1490 and apply anti seize compound to the shaft Fig 1492 Fig 1490 PICT 7645 Fig 1492 CLR DSC 0857 11 Install the bolt and nut retaining the control linkage to the pump lever assembly Fig 1491 13 The drive pulley assembly consists of the following parts pulley bushing 3 screws and 3 washers Fig Note Bolt should go into pump bracket then 1493 through the control rod Fig 1493 CLR DSC 0858 Fig 1491 CLR DSC 0835 A Pulley C Screws B Bushing D Washers 8 96 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 14 Assemble the pulley and bushing with the 3 screws 16 With a straight edge align the hydrostatic pulley and washers Just start the sc
20. 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 14 Install the right and left counterweights with 4 bolts 15 Install a new or rebuilt drive sprocket wheel on the and lockwashers 2 each per counterweight Fig drive motor shaft making sure the woodruff key is in 1296 place Fig 1297 Note Whenever this style drive wheel sprocket has been removed from the wheel motor the center wheel hub drive must be replaced Do Not Reuse Reason When the wheel drive sprocket is installed the center wheel hub expands enough to fit the wheel motor shaft Once the rear wheel drive sprocket has been removed it will not fit on the wheel motor shaft properly Refer to Drive Sprocket Rebuild on page 8 46 Fig 1296 DSC 0895 Fig 1297 DSC 0933 TX420 TX425 Series Service Manual Rev 001 8 45 DRIVE SYSTEM 16 Install the castle nut on the motor drive shaft Fig 18 Install cotter pin Fig 1300 1298 Fig 1300 DSC 0926 Fig 1298 DSC 0797 Drive Sprocket Rebuild 17 Engage the park brake and torque the castle nut to 300 ft lbs 406 74 Nm Fig 1299 Note Whenever the rear wheel drive sprocket has been removed from the wheel motor the Note When torque has been obtained check the center hub must be replaced Do Not Reuse alignment of the hole for the cotter pin turn Reason when the wheel drive sprocket is until the hole is aligned with the slot in the installed the center wheel hub expands castle nut enough
21. 05 Fig 1282 DSC 0776 20 Remove the two wheel motor mounting plates Fig 22 To service the wheel motor refer to Parker Ross 1281 Wheel Motor Service Manual Toro form no 492 4753 Wheel Motor Installation 1 Wheel motor mounting plates have a wide side and narrow side The wide side faces up when installing the wheel motor Fig 1283 Fig 1281 DSC 0774 Fig 1283 CLR DSC 0686 A Wide side B Narrow side TX420 TX425 Series Service Manual Rev 001 8 41 DRIVE SYSTEM 2 Insert the wheel motor into the frame with the ports 4 Apply locking compound to the threads of the wheel facing up Rotate the wheel motor 90 so the hy motor mounting bolts Fig 1286 draulic ports are facing to the rear of the machine Fig 1284 Fig 1286 DSC 0688 Fig 1284 DSC 0776 5 Install the 4 bolts and lockwashers through the motor housing frame and into the motor mounting plates 3 Install the wheel motor mounting plates on the inside Torque the bolts to 75 8 ft lbs 102 11 Nm Fig of the frame 1287 Note The wide side of the motor mounting plates faces up Fig 1285 Fig 1287 DSC 0924 Fig 1285 DSC 0777 8 42 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 6 Slide the brake housing back into the frame Install 8 Install the two hydraulic lines making sure the and tighten the two bolts and lockwashers that retain tagged or marked hydraulic fitting is connected to the brake assembly to
22. 1446 D Hydraulic hose running from the D port on the hydrostatic pump to the upper fitting on the left 7 Ensure the foam engine baffle strip is installed wheel motor Fig 1395 properly on the top edge of the engine baffle E Hydraulic hose running from the E port on the 8 Position the key in the keyway of the hydrostatic hydrostatic pump to the lower fitting on the left pump shaft Fig 1397 wheel motor Fig 1395 Fig 1397 PICT 1452 Fig 1395 PICT 1433 TX420 TX425 Series Service Manual Rev 001 8 71 DRIVE SYSTEM 9 Slide the pulley onto the hydrostatic pump shaft 11 Using a 5 8 socket torque the nut on the hydraulic aligning the keyway with the key Fig 1398 pump shaft to 18 25 ft lbs 24 33 9 Nm Fig 1399 12 Install the drive belt Refer to Drive Belt Installation on page 8 2 13 Using a 1 2 socket and wrench install the nut and bolt to secure the steering linkage to the pump control arm Fig 1400 Fig 1398 PICT 1453 10 Install the washer and nut onto the hydrostatic pump shaft Fig 1399 Fig 1400 PICT 1438 14 Install the right hand panel onto the control panel assembly Fig 1401 Fig 1399 PICT 1455 Fig 1401 PICT 1414a 8 72 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 15 Using a 3 8 socket install 4 screws to secure the 17 Using a 3 8 socket install 4 screws to secure the right hand panel to the control panel assembly
23. 420 TX425 Series Service Manual DRIVE SYSTEM Hydrostatic Pump Right Side Removal 3 Using a spring removal tool Toro p n 92 5771 remove the idler arm spring off the stud located on the loader tower Fig 1502 Note Right pump drives the left side wheel motor Note Cleanliness is a key factor in a successful repair of any hydrostatic system Thoroughly clean all exposed surfaces prior to any type of maintenance Cleaning all parts by using a solvent wash and air drying is usually adequate As with any precision equipment all parts must be kept free of foreign material and chemicals Protect all exposed sealing areas and open cavities from damage and foreign material Upon removal all seals o rings and gaskets should be replaced During installation lightly lubricate all seals o rings and gaskets with clean petroleum jelly prior to assembly 1 Raise and securely support the unit Refer to Lifting Fig 1502 DSC 0825 the Unit for Service page 8 2 2 Raise the hood assembly Remove the 3 screws and washers located on the hydrostatic pump pulley Fig 4 Remove the hydrostatic drive belt off the hydrostatic 1501 pulley Fig 1503 Fig 1501 CLR DSC 0864 Fig 1503 CLR DSC 0826 TX420 TX425 Series Service Manual Rev 001 8 99 DRIVE SYSTEM 5 There are 3 threaded holes located in the pulley 7 Remove the left hand panel by removing 4 screws bushing Install the 3 bolts that were retaining the Fig 1506
24. 61 DSC 0733 TX420 TX425 Series Service Manual Rev 001 8 35 DRIVE SYSTEM TX425 220000001 220999999 Note The outer race of the bearing is flush with the center hub of the tensioner assembly Fig 1263 Tensioner Arm Bearing Installation Note The raised inner race of the bearing should be facing outward on both bearings on the tensioner arm Fig 1262 Fig 1263 DSC 0739 2 Reassemble the tensioner assembly with bolt 2 washers and nut Fig 1262 DSC 0737 Note Make sure the chamfer edge of the inner ten i sion wheel is toward the center Fig 1264 1 Press the first bearing in so it seats against the inner race of the housing Turn the tensioner assembly over and install the spacer centered on the inner race tensioner wheel bolt can be used to keep the spacer centered to the bearing inner race and press the second bearing in until it seats against the inner race and spacer Fig 1262 Important Press on outer bearing race only other wise bearing damage could occur Fig 1264 CLR DSC 0741 8 36 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM Note On model TX425 22307 serial number range 4 Remove cotter pin from the wheel motor shaft Fig 220000001 220000400 the tensioner arms 1266 are offset Fig 1265 On serial number range 220000401 220999999 the arm aligns with the tensioner tube Fig 1266 DSC 0894 Fig 1265 CLR DSC 0746 5 With a 1 1 2 socket re
25. 667 8 58 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 8 Remove the 4 bolts and nuts retaining the left and 10 Traction control assembly Fig 1351 right bushings retaining the pivot arm shafts Fig 1349 Note The right front bolt retaining the bushing can not be removed due to clearance with the hydraulic line Fig 1351 CLR DSC 3675 A RH Lever Return G LH Lever Return B Bearing Return to H Bolt to Proximity Switch Neutral LH Pivot Bracket C Washers 2 J Bushings 2 Fig 1349 DSC 3670 D Spring Washer K Flange Bearings 2 E RH Pivot Bracket L Bearing Support Block F Extension Spring M Drive Rod Assembly 9 Lower the traction control assembly out of the con trol panel Fig 1350 Traction Control Handle Assembly Installation 1 Raise the traction control assembly into the control panel Fig 1352 Fig 1350 DSC 3672 Fig 1352 CLR DSC 3672 TX420 TX425 Series Service Manual Rev 001 8 59 DRIVE SYSTEM 2 Install the right and left bushings on the pivot arm 4 Install the right side linkage rod to the drive rod shafts and install the 4 bolts and nuts retaining the assembly with a bolt spacer and nut through the bushings to the control panel assembly Fig 1353 rod end bearing Fig 1355 Fig 1353 DSC 3670 Fig 1355 CLR DSC 3666 3 Install the left side linkage rod to the drive rod as 5 Install the center panel assembly Fig 1356 sembly with a bolt spacer and nut
26. 671 TX420 TX425 Series Service Manual Rev 001 8 2 DRIVE SYSTEM 13 Install the rear access cover Fig 1232 Fig 1232 DSC 0666 14 Before installing the rear sprocket drive wheel make sure the motor shaft drive wheel is free of any lubricant such as grease Check and make sure the woodruff key is in place Install the rear sprocket drive onto the motor shaft Fig 1233 Note This style of drive wheel can be reused It does not need to be replaced unless it is damaged Fig 1233 DSC 0693 8 28 Rev 001 15 The retaining nut on the wheel motor is a patch lock nut and should be replaced with a new one Apply the park brake install retaining nut and torque the nut 300 ft lbs 407 Nm Fig 1234 Fig 1234 DSC 0694 16 Align the track guide Refer to Track Guide Align ment as follows e TX420 page 8 113 e TX425 page 8 115 17 Install the track Refer to Track Installation as follows e TX420 page 8 12 e TX425 cast drive wheel page 8 19 e TX425 drive sprocket wheel page 8 49 18 Lower the unit to the floor TX420 TX425 Series Service Manual DRIVE SYSTEM TX425 220000001 220999999 3 Using a 1 2 hex head wrench and a 15 16 socket remove the nut and washer on the tension wheel Fig 1237 Track Removal n e pm i cae Fig 1235 DSC 0698 FIGA A 4 Using a 1 2 drive ratchet release the drive tension by turning the tensioner bolt clockwise unt
27. 80 spring end to remove the spring from the bolt stud Fig 1382 Fig 1380 PICT 1433 Fig 1382 PICT 1439 3 Using a 1 2 socket and wrench remove the nut and bolt securing the steering linkage to the right hand 6 Remove spring from the idler arm Fig 1383 pump control arm Fig 1381 Fig 1383 PICT 1441 Fig 1381 PICT 1438 TX420 TX425 Series Service Manual Rev 001 8 67 DRIVE SYSTEM 7 Remove the belt from the pulleys Fig 1384 9 Using a 2 jaw puller remove the right pulley from the hydrostatic pump shaft Fig 1386 Note The seal strip on the engine baffle may have to be removed from the baffle to allow for the 2 jaw puller Fig 1384 PICT 1442 8 Secure the right hand pulley and using a 5 8 socket remove the nut and washer securing the Fig 1386 PICT 5629 pulley to the right hydrostatic pump Fig 1385 10 Using a 3 4 wrench and socket with a swivel attach ment or universal joint remove the 2 bolts securing the hydrostatic pump to the tower Fig 1387 Fig 1385 PICT 1443 Fig 1387 PICT 1446 8 68 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 11 Carefully remove the hydrostatic pump from the Hydrostatic Pump Installation Right Side tower assembly by lowering it down and out at the battery box location Fig 1388 Prior to connecting the hydraulic lines the o rings should be replaced with new ones and lightly lubricated with oil 1 When installing a n
28. 88 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 1 Raise and securely support the unit Refer to Lifting 4 Remove the hydrostatic drive belt off the hydrostatic Unit for Service on page 8 2 pulley Fig 1466 2 Raise the hood assembly Remove the 3 screws and washers located on the hydrostatic pump pulley Fig 1464 Fig 1466 CLR DSC 0826 Fig 1464 PICT 7643 5 There are 3 threaded holes located in the pulley hub Install the 3 bolts that were retaining the pulley hub and pulley and tighten them equally until the hub breaks free from the pulley Fig 1467 3 Remove the idler arm spring from the stud located on the loader tower Fig 1465 Fig 1467 DSC 0827 Fig 1465 DSC 0825 TX420 TX425 Series Service Manual Rev 001 8 89 DRIVE SYSTEM 6 Carefully remove the hub and the pulley Fig 1468 8 Remove the right hand panel by removing the 4 screws that retain the panel to the control panel Fig Note Remove the hub and pulley being careful not 1470 to lose the key that goes onto the pump shaft Fig 1470 CLR DSC 0843 Fig 1468 PIC T 2094 9 Open the rear access door 7 Remove the left hand panel by removing the 4 screws that retain the panel to the control panel Fig 10 Disconnect the negative and then the positive 1469 battery cable Remove the battery bracket clamp Tilt the battery and remove it from the unit 11 Remove the bolt and nut retaining the control linkage to the p
29. DRIVE SYSTEM TX420 amp 425 All Serial Numbers 4 Remove the spring from the idler arm Fig 1132 Drive Belt Removal 1 Shut engine off apply parking brake and remove ignition key 2 Open the engine hood assembly 3 With a spring removal tool Toro P N 92 5771 connect the tool to the spring end located on the stud bolted to the loader tower edge Pull up on the spring end to remove the spring from the bolt stud Fig 1131 Fig 1132 PICT 1441 5 Remove the belt from the pulleys Fig 1133 Fig 1131 DSC 0587 Fig 1133 DSC 0591 TX420 TX425 Series Service Manual Rev 001 8 1 DRIVE SYSTEM Drive Belt Installation 1 Install the drive belt around the engine crankshaft pulley two hydrostatic pump pulleys and the idler pulley Fig 1134 Fig 1134 belt routing diagram A Hydrostatic pulley C Idler pulley B Crankshaft pulley 2 Install one end of the idler spring to the idler arm Fig 1135 Fig 1135 DSC 0592 8 2 Rev 001 Using the spring removal tool Toro P N 92 5771 install the spring to the stud located on the loader tower Fig 1136 Fig 1136 DSC 0594 TX420 amp 425 All Serial Numbers Lifting Unit for Service Place two pieces of approximately 2 5 08cm thick wood directly behind both tracks Fig 1137 Fig 1137 DSC 0596 TX420 TX425 Series Service Manual DRIVE SYSTEM 2 Back the unit up onto the wood blocks Fig 1138 4 Raise the rear of th
30. DSC 0930 Fig 1320 DSC 0812 9 Remove the alignment tool 12 Install the front of the track over the front inner tensioner wheel Fig 1321 10 Remove the outer tensioner wheel Fig 1319 Fig 1321 DSC 0931 Fig 1319 DSC 0811 TX420 TX425 Series Service Manual Rev 001 8 51 DRIVE SYSTEM 13 Re install the outer tensioner wheel washer and nut Fig 1322 Fig 1322 DSC 0814 14 Tighten and torque the bolt and nut to 150 ft lbs 203 37 Nm Fig 1323 DSC 0815 Fig 1323 8 52 Rev 001 15 With a 1 2 ratchet turn the tensioning screw coun terclockwise until the distance between the tension nut and the back tension tube is 2 3 4 7cm Fig 1324 and Fig 1325 Fig 1324 DSC 0816 Fig 1325 fig 35 m 4747 A Locking bolt B Tensioning screw C Tensioning tube D Tension wheel TX420 TX425 Series Service Manual DRIVE SYSTEM 16 Align the closest notch in the tension screw to the 3 Connect a spring removal tool Toro P N 92 5771 locking bolt and secure the screw with the locking to the spring end located on the stud bolted to the bolt and nut Fig 1326 loader tower assembly Fig 1327 Fig 1326 DSC 0932 Fig 1327 DSC 0587 17 Lower the traction unit to the ground 4 Pull up on the spring end to remove the spring from the bolt stud Fig 1328 TX420 amp 425 All Serial Numbers Idler Arm Assembly Removal 1 Shut engine off apply parking brake and remove ignition
31. Note Make sure the hole for the cotter pin is aligned with the crown nut and the motor shaft Fig 1307 DSC 0933 Fig 1309 DSC 0798 8 48 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 10 Install a cotter pin Fig 1310 2 Loosen the 3 nuts on the carriage bolts located on the track guide clamp Fig 1312 Fig 1310 DSC 0926 Fig 1312 DSC 0801 Track Installation 3 Loosen the two inner bolts retaining the track guide 1 Install a washer the outer tensioner wheel assembly to the frame Fig 1313 a second washer and a nut Do Not tighten nut leave loose Fig 1311 Fig 1313 DSC 0802 Fig 1311 DSC 0927 TX420 TX425 Series Service Manual Rev 001 8 49 DRIVE SYSTEM 4 Insert the notched end of the alignment tool into the 6 Rotate the tool and move the track guide as neces drive sprocket wheel spacer Fig 1314 sary until the tool fits into the track guide channel Secure the end of the tool with a strap Fig 1316 Fig 1314 DSC 0928 Fig 1316 DSC 0806 5 Secure the end with the pin Fig 1315 7 Tighten and torque the two inner track guide mount ing bolts to 75 ft lbs 102 Nm Fig 1317 Fig 1315 DSC 0805 Fig 1317 DSC 0929 8 50 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 8 Tighten and torque the three nuts on the carriage 11 Install the track over the rear drive sprocket wheel bolts to 75 ft lbs 102 Nm Fig 1318 Fig 1320 Fig 1318
32. Rev 001 8 33 DRIVE SYSTEM 3 Check the center hole on the outer and inner ten 5 Assembly Install bolts through the inner tensioner sioner wheels for wear The center hole should be wheel with the bolt heads on the chamfer edge side 5 8 1 58cm round Fig 1254 If the hole is out of of the inner tensioner wheel Fig 1256 round the tensioner wheel s needs replacing follow steps 4 9 If the center shows no sign of wear go on to step 10 Fig 1256 CLR DSC 0726 Fig 1254 CLR DSC 0718 6 Install the block spacer onto the bolts Fig 1257 4 Disassembly Remove two bolts and nuts retaining the tensioner wheel assembly Fig 1255 Fig 1257 CLR DSC 0727 Fig 1255 CLR DSC 0725 8 34 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 7 Install the outer tensioner wheel and the two nuts 9 Torque the two bolts and nuts to 30 ft lbs 41 N m Fig 1258 Fig 1260 Fig 1258 CLR DSC 0728 Fig 1260 CLR DSC 0730 8 Before tightening the bolts and nuts slide the 10 Support the tensioner arm either in a bench vice or tensioner wheel bolt through the inner and outer on a flat bench making sure there is space under it tensioner wheels to make sure everything is aligned for bearing removal Using a hammer and punch Fig 1259 drive the bottom bearing out of the housing Turn the tensioner arm over and drive out the other bearing Remove the spacer Fig 1261 Fig 1259 CLR DSC 0729 Fig 12
33. SC 0824 3 With a ratchet and socket remove bolt retaining the road wheel Fig 1540 5 Press bearing out from the seal side pressing on the inner race of the bearing Fig 1542 Fig 1540 CLR DSC 0823 Fig 1542 CLR DSC 0827 8 110 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 6 Using a drift punch and hammer tap out the seal 2 Pressing on the outer race press bearing in until it Fig 1543 seats against the inner shoulder of the road wheel Fig 1545 Fig 1543 CLR DSC 0828 Fig 1545 CLR DSC 0830 Road Wheel Bearing and Road Wheel Assembly Installation 3 Apply grease around the bearing before installing the seal Fig 1546 1 The raised portion of the bearing should be installed toward the seal side Fig 1544 Fig 1546 CLR DSC 0831 Fig 1544 CLR DSC 0829 TX420 TX425 Series Service Manual Rev 001 8 111 DRIVE SYSTEM 4 Align seal so the lip is facing the bearing Fig 1547 6 Install the road wheel on the track guide and torque bolt to 150 ft lbs 203 Nm Fig 1549 Fig 1547 CLR DSC 0832 Fig 1549 CLR DSC 0824 5 Press seal in until it is flush with the inner hub of the road wheel Fig 1548 7 Fill the cap with grease and install the wheel gasket Fig 1550 Fig 1548 CLR DSC 0833 Fig 1550 CLR DSC 0835 8 112 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 8 Secure the road wheel cap with the snap ring Fig Alignment Tool Toro P N 110 0069 Fig
34. Tighten with a 15 16 15 60 offset open end wrench Fig 1527 11 Install the pulley key in the hydrostatic pump shaft and apply anti seize compound to the shaft Fig 1529 Fig 1527 DSC 0885 Fig 1529 DSC 0890 8 106 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 12 The drive pulley assembly consists of the following 14 Install the pulley on the hydrostatic pump shaft parts Fig 1530 aligning the key into the slot in the hub Fig 1532 Turn the screws further into the pulley so the hub still slides on the pump shaft Do Not tighten the screws at this time Fig 1530 CLR DSC 0858 A Pulley C Screws B Hub D Washers Fig 1532 DSC 0893 13 Assemble the pulley and hub with the 3 screws and 15 With a straight edge align the hydrostatic pulley washers Just start the screws in the threaded holes to the crankshaft pulley Fig 1533 Once aligned of the pulley Fig 1531 tighten the 3 screws evenly into the pulley Fig 1531 CLR DSC 0860 Fig 1533 DSC 0891 TX420 TX425 Series Service Manual Rev 001 8 107 DRIVE SYSTEM 16 Install the drive belt around the hydrostatic pulley 18 Install the battery in the unit and install the battery Recheck and tighten the 3 pulley screws Fig 1534 clamp Connect the positive and then the negative battery cable 19 Start the engine and purge the hydraulic system Refer to Purging Air Procedures on page 12 27 20 Check all the hydraulic lin
35. X425 Series Service Manual Rev 001 8 101 DRIVE SYSTEM 14 Remove the hydraulic line from the right side of the 16 Loosen the metal hydraulic line at the T fitting hydrostatic pump using 15 16 15 60 offset open located on the right side of the left hydrostatic pump end wrench Fig 1511 Place a protective cap on using a 15 16 open end wrench Fig 1513 Do Not the hydraulic line remove just loosen This is to allow you to swivel the other end of the metal line out of the way when removing and installing the right hydrostatic pump Fig 1511 DSC 0879 Fig 1513 CLR DSC 0842 15 Remove the hydraulic hose from the T fitting located on the right side of the hydrostatic pump using a 15 16 open end wrench Fig 1512 Place a 17 Remove the right hydraulic line located at the tee protect ive cap on the hydraulic hose fitting on the top of the hydrostatic pump using a 15 16 15 60 offset open end wrench Fig 1514 Install a protective cap on the hydraulic line and on the hydraulic fitting Fig 1514 DSC 0882 Fig 1512 CLR DSC 0841 8 102 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 18 Remove the left hydraulic line located at the tee 20 Remove the two mounting bolts and nuts Use a fitting on top of the hydrostatic pump using a 15 16 socket swivel on the top nut to get around the tee 15 60 offset open end wrench Fig 1515 Install fitting on the top of the hydrostatic pump Fig 1517
36. ack guide toward the drive sprocket Fig 1165 to the frame Remove the board and hydraulic jack from under the track guide 3 Install the tensioner arm into the frame above the track guide Fig 1167 Fig 1165 DSC 0619 Fig 1167 DSC 0623 8 10 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 4 Alignment Tool Toro P N 110 0069 Fig 1168 6 Secure the end with the pin Fig 1170 Fig 1168 CLR DSC 0624 Fig 1170 DSC 0628 5 Insert the notched end of the alignment tool into the 7 Rotate the tool and move the track guide as neces drive wheel spacer Fig 1169 sary until the tool fits into the track guide channel Secure the end of the tool with a strap Fig 1171 Fig 1169 DSC 0625 Fig 1171 DSC 0629 TX420 TX425 Series Service Manual Rev 001 8 11 DRIVE SYSTEM 8 Tighten and torque the 4 track guide mounting bolts 1 Engage the lugs on the track between the spacers to 75 ft lbs 102 Nm Fig 1172 on the drive sprocket Fig 1173 Fig 1172 DSC 0631 Fig 1173 DSC 0633 9 Remove the alignment tool 2 Push the track under and between the road wheels Starting at the bottom of the tension wheel install the track around the wheel by rotating the track rearward while pushing the lugs onto the wheel Fig TX420 All Serial Numbers 1174 Track Installation Important Before installing the track use the Alignment Tool Toro P N 110 0069 for proper alignment between the drive sprockets
37. e connections for any leaks 2 Install the right hand panel and retain with 4 screws Fig 1536 Fig 1534 CLR DSC 0864 17 Install the idler arm spring on the idler arm and onto the stud located on the loader tower Fig 1535 Fig 1536 CLR DSC 0843 Fig 1535 DSC 0825 8 108 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 22 Install the left hand panel and retain with 4 screws Road Wheel Bearing Replacement Fig 1537 Check and grease the road wheels every 250 operating hours or yearly Note It is usually not necessary to remove the track guide when replacing any of the road wheel bearings They can also be removed by raising the unit off the ground For safety reasons make sure the frame of the unit is securely supported 1 Remove the snap ring from the inner hub of the road wheel Fig 1538 Fig 1537 DSC 0829 23 Check the traction control for neutral Refer to Traction Control Tracking Adjustment Full Forward Position on page 12 26 and Traction Control Neutral Adjustment on page 12 27 24 Check and if needed fill the hydraulic tank 25 Close the rear back cover and the hood Fig 1538 CLR DSC 0821 26 Lower the unit to the ground TX420 TX425 Series Service Manual Rev 001 8 109 DRIVE SYSTEM 2 Remove wheel bearing cap with seal Fig 1539 4 Remove the road wheel from the track guide Fig 1541 Fig 1539 CLR DSC 0822 Fig 1541 CLR D
38. e tensioner arm wheel shaft Fig 1558 Fig 1558 DSC 0648 TX420 TX425 Series Service Manual Rev 001 DRIVE SYSTEM 2 Ensure the 4 or 5 track guide mounting bolts are loose Fig 1559 Fig 1559 DSC 0643a 3 Insert the notched end of the alignment tool into the drive wheel spacer Fig 1560 Fig 1560 DSC 0650 8 115 DRIVE SYSTEM 4 Secure the end of the alignment tool with the align 6 Tighten and torque the 4 track guide mounting bolts ment tool pin Fig 1561 to 75 ft lbs 102 Nm Fig 1563 Fig 1561 DSC 0651 Fig 1563 DSC 0654 5 Rotate the alignment tool and move the track guide 7 Remove the alignment tool as necessary until the alignment tool fits into the track guide channel Secure the end of the alignment 8 Install the track Refer to Track Installation tool with a strap Fig 1562 e 7TX425 with cast drive wheel page 8 13 e TX425 with drive sprocket wheel page 8 29 Fig 1562 DSC 0653 8 116 Rev 001 TX420 TX425 Series Service Manual
39. e unit remove the two wood blocks and install a jack stand under each corner of the frame Fig 1140 Fig 1138 DSC 0597 Fig 1140 DSC 0600 3 Place a hydraulic floor jack under the rear frame of the unit Fig 1139 5 Raise the hydraulic floor jack approximately 15 38 10cm and position it at the front of the unit Fig 1141 Fig 1139 DSC 0598 Fig 1141 DSC 0601 TX420 TX425 Series Service Manual Rev 001 8 3 DRIVE SYSTEM 6 Start the unit and raise the loader arm enough to clear the hydraulic floor jack Place the floor jack directly below the quick attach plate and lower the loader arm onto the hydraulic floor jack Continue lowering the loader arm to raise the tracks off the ground Fig 1142 Fig 1142 DSC 0603 7 Install two jack stands under the front frame Fig 1143 Fig 1143 DSC 0604 8 4 Rev 001 8 Lower the hydraulic floor jack so the unit rests on the jack stands Fig 1144 ah i na u m j a Fig 1144 DSC 0605 9 Make sure the unit is securely supported by the jack stands TX420 All Serial Numbers Track Removal 1 Raise and secure the unit off the ground Refer to Lifting Unit for Service page 8 2 TX420 TX425 Series Service Manual DRIVE SYSTEM 2 Remove the bolt and nut securing the tensioner bolt Fig 1145 Note Serial number 250000399 and below may have square tensioner arms Fig 1147 fig 34 m 4747 A Locking bolt C Tensio
40. el sending unit located on the top of the fuel tank Fig 1273 14 Before removing the hydraulic lines from the motor mark or tag one of the lines this will ensure the hydraulic lines are reinstalled in the proper ports Fig 1275 Fig 1273 DSC 0898 A Center terminal B Outside terminal orange wire black wire Fig 1275 DSC 0901 TX420 TX425 Series Service Manual Rev 001 8 39 DRIVE SYSTEM 15 Place a drain pan under the motor wheel that is 17 Remove the 4 bolts and lock washers retaining the being removed Using a 1 1 8 15 60 offset open wheel motor to the frame Fig 1278 end wrench disconnect the two hydraulic lines running to the wheel motor Install protective caps on the hydraulic lines Fig 1276 Fig 1278 DSC 0902 Fig 1276 DSC 0766 18 Move the park brake to the OFF position remove the two bolts and lockwashers retaining the brake assembly Fig 1279 16 Using a 1 1 16 socket remove the two hydraulic fittings from the wheel motor Install protective caps in the wheel motor hydraulic openings Fig 1277 Fig 1279 DSC 0903 Fig 1277 DSC 0767 8 40 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 19 Move the brake housing toward the center of the unit 21 Rotate the wheel motor 90 so the hydraulic line Fig 1280 ports are facing upward this will allow the raised portion of the wheel motor to fit through the notch in the frame Fig 1282 Fig 1280 DSC 09
41. er the lower bearing out The spacer will fall out when the bearing is removed Turn the tensioner wheel over and drive out the other bearing Inspect the tensioner wheel housing and spacer Fig 1155 Fig 1153 DSC 0613 2 Remove the bolt and nut holding the tensioner wheel to the tensioner arm Fig 1154 Fig 1155 CLR DSC 0808 Bearing Installation Note The raised inner race of the bearing should be facing outward on both bearings on the tensioner wheel Fig 1156 Fig 1154 CLR DSC 0804 Fig 1156 CLR DSC 0810 TX420 TX425 Series Service Manual Rev 001 8 7 DRIVE SYSTEM 1 Press the first bearing in so far that the outer bearing 2 Reassemble the tensioner wheel to the tension arm race is flush with the center hub Turn the tensioner wheel over and install the spacer centered on the Note Make sure that grease is applied to the flat inner race tensioner wheel bolt can be used to keep washers on both sides and the washers are the spacer centered to the bearing inner race and installed between the tensioner arm and press the second bearing in until the spacer is held tensioner wheel on both sides Fig 1158 in tight between the bearings Important Press on outer bearing race only other wise bearing damage could occur Note The outer race of the bearing is flush with the center hub of the tensioner wheel Fig 1157 Fig 1158 CLR DSC 0813 3 Torque the bolt and nut holding the tensioner wheel t
42. ersal joint tighten the 2 bolts and nuts to secure wheel motor Fig 1449 the hydraulic pump to the tower Fig 1451 Fig 1449 PICT 1487 Fig 1451 PICT 1475 F Hydraulic hose running from the F port on the 9 Position the key in the keyway of the hydrostatic right side pump to the lower fitting on the left pump shaft Fig 1452 wheel motor Fig 1450 Fig 1452 PICT 1490 Fig 1450 PICT 1488 TX420 TX425 Series Service Manual Rev 001 8 85 DRIVE SYSTEM 10 Slide the pulley onto the hydrostatic pump shaft 12 Using a 5 8 socket install the washer and nut onto aligning the keyway with the key Fig 1453 the hydrostatic pump shaft Torque the nut to 18 25 ft lbs Fig 1455 Fig 1453 PICT 1492 Fig 1455 PICT 1494 11 Install the washer and nut onto the hydrostatic pump shaft Fig 1454 13 Install the drive belt Refer to Drive Belt Installation on page 8 2 14 Using a 1 2 socket and wrench install the nut and bolt to secure the steering linkage to the pump control arm Fig 1456 Fig 1454 PICT 1493 Fig 1456 PICT 1471 8 86 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 15 Install the right hand panel onto the control panel 17 Install the left hand panel from the control panel assembly Fig 1457 assembly Fig 1459 Fig 1457 PICT 1414a Fig 1459 PICT 1416 16 Using a 3 8 socket install 4 screws to secure the 18 Using a 3 8 socket install 4 screws t
43. ew hydrostatic pump make sure all the fittings are installed properly Fig 1389 Fig 1388 PICT 1447 12 To service the hydrostatic pump refer to the Hydro Fig 1389 PICT 1449a Gear BDP 10A 16A 21L Service and Repair Manual Toro form no 492 4789 or the Hydro A Oil inlet D Wheel motor 2 Gear P Series Pumps Service and Repair Manual B Case Drain E Pump bypass Form no BLN 52503 C Check valve 2 TX420 TX425 Series Service Manual Rev 001 8 69 DRIVE SYSTEM 2 Loosely install the lower bolt and nut with the head 4 Loosely install the upper bolt and nut to hold the of the bolt toward the engine pump in position 3 Carefully position the pump into the battery box 5 Using a 15 16 wrench connect the right hand location and up into position in the tower assembly hydrostatic pump lines as follows Fig 1390 C Case drain line Fig 1392 Fig 1390 PICT 1447 Fig 1392 PICT 1430 Note Use the previously installed lower bolt and B Inlet line from the hydraulic oil filter Fig 1393 nut to help support the pump while installing Fig 1391 Fig 1393 PICT 1429 Fig 1391 PICT 1450 8 70 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM A Inlet line from the left hand hydraulic pump Fig 6 Using a 3 4 wrench and socket with a swivel or 1394 universal joint tighten the 2 bolts and nuts to secure the hydraulic pump to the tower Fig 1396 Fig 1394 PICT 1428 Fig 1396 PICT
44. ghten using a 15 16 15 60 offset open end wrench Fig 1521 Fig 1521 DSC 0882 8 104 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 4 Install and tighten the metal line leading to the right 6 Connect the hydraulic hose to the left hydraulic side of hydrostatic pump using a 15 16 15 60 fitting located on the bottom of the hydrostatic offset open end wrench Fig 1522 pump Tighten with a 15 16 15 60 offset open end wrench Fig 1524 Fig 1522 DSC 0879 Fig 1524 DSC 0878 5 Tighten the hydraulic line and hydraulic hose leading to the T fitting located on the right side of the left 7 Connect the hydraulic hose this should be the line hydrostatic pump using a 15 16 15 60 offset open that is marked to the right hydraulic fitting located end wrench Fig 1523 on the bottom right side of the hydrostatic pump Tighten with a 15 16 15 60 offset open end wrench Fig 1525 Fig 1523 DSC 0881 Fig 1525 DSC 0870 TX420 TX425 Series Service Manual Rev 001 8 105 DRIVE SYSTEM 8 Tighten the two pump mounting bolts and nuts to the 10 Install and tighten the bolt and nut retaining the tower assembly Fig 1526 control linkage to the pump lever assembly Fig 1528 Note Bolt should go into pump bracket first then through the control rod Fig 1526 DSC 0884 9 Connect the hydraulic hose to the front hydraulic Fig 1528 CLR DSC 0868 fitting on the loader valve
45. ground TX420 TX425 Series Service Manual Rev 001 8 21 DRIVE SYSTEM 4 Using a wheel puller remove the drive sprocket Fig 6 Remove the three bolts retaining the LH rear cover 1208 support Remove the LH rear cover support Fig 1210 Fig 1208 PICT 0536 Fig 1210 DSC 0669 5 Remove the rear access cover Fig 1209 7 Remove the right and left rear counterweights Fig 1211 Fig 1209 DSC 0666 Fig 1211 PIC T 0549 8 22 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 8 Remove the eight bolts retaining the rear chassis 10 Carefully slide the tank out and disconnect the fuel cover assembly and remove the rear chassis cover hose from the fuel tank fitting Fig 1214 Fig 1212 Fig 1214 PICT 1716 Fig 1212 DSC 0671 11 Before removing the hydraulic lines from the motor 9 Remove the two wires located on the fuel sender on mark or tag one of the lines this will make sure the the fuel tank Fig 1213 hydraulic lines are reinstalled correctly Fig 1215 Fig 1213 PICT 1718 Fig 1215 DSC 0677 A Center terminal B Right terminal orange wire black wire TX420 TX425 Series Service Manual Rev 001 8 23 DRIVE SYSTEM 12 Place a drain pan under the motor wheel that is 14 Remove the 4 bolts lock washers and wheel motor being removed Using a 1 1 8 15 60 offset open mounting plates retaining the wheel motor to the end wrench disconnect the two hydraulic lines frame Fig 1218
46. il the tensioning nut contacts the tensioner bolt head 2 Remove the bolt and nut securing the tensioner bolt Push the tension wheel toward the rear of the unit Fig 1236 Fig 1238 and Fig 1239 1 Raise and secure the unit off the ground Follow procedures for Lifting Unit for Service page 8 2 Fig 1236 DSC 0700 Pig 1238 pe TX420 TX425 Series Service Manual Rev 001 8 29 DRIVE SYSTEM 6 Remove the track off the front inner tension wheel Fig 1241 Fig 1239 fig 35 m 4747 A Locking bolt C Tension tube B Tensioning screw D Tension wheel Fig 1241 DSC 0706 5 Remove the outer tensioner wheel Fig 1240 7 Remove the track off the rear drive sprocket wheel Fig 1242 Fig 1240 DSC 0705 Fig 1242 DSC 0707 8 30 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM TX425 220000001 220999999 4 Remove the 3 nuts retaining the track clamp guide Remove the clamp guide Fig 1244 Track Guide Removal 1 Raise and securely support the unit Refer to Lifting Unit for Service page 8 2 2 Remove the track Refer to Track Removal on page 8 29 3 Install a hydraulic floor jack and a suitable board under the track guide Fig 1243 Fig 1244 DSC 0709 5 Remove the 2 bolts on the inside of the track guide Fig 1245 Fig 1243 DSC 0708 Fig 1245 DSC 0710 TX420 TX425 Series Service Manual Rev 001 8 31 DRIVE SYSTEM 6 Lower the track guide from the
47. ing tray 6 Using a 3 4 socket remove both rear counter Fig 1411 weights Fig 1413 Fig 1411 PICT 1034a Fig 1413 PICT 7633 TX420 TX425 Series Service Manual Rev 001 8 75 DRIVE SYSTEM 7 Using a 3 4 and a 9 16 socket remove the rear 9 Remove the fuel line from the fuel tank Slide the chassis cover by removing the 8 sets of fasteners fuel tank out of the frame Fig 1416 Fig 1414 Note Use a floor jack to raise the machine off the jack stands to remove the rear chassis cover from the machine Lower the machine back onto the jack stands Fig 1416 PICT 7638 10 Using a 3 8 socket remove the 4 screws holding the right hand panel to the control panel assembly Fig 1414 PICT 7636 Fig 1417 8 Disconnect the two wires on the fuel sending unit located on top of the fuel tank Fig 1415 Fig 1417 PICT 1413 Fig 1415 PIC T 0555 A Center terminal B Outside terminal orange wire black wire 8 76 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 11 Remove the right hand panel from the control panel 13 Remove the left hand panel from the control panel assembly Fig 1418 assembly Fig 1420 Fig 1418 PICT 1414a Fig 1420 PICT 1416 12 Using a 3 8 socket remove the 4 screws holding Marking the Left Hand Hydrostatic Pump the left hand panel to the control panel assembly Lines Fig 1419 1 Mark the hydrostatic pump lines as follows A Hydraulic oil inlet from
48. key 2 Lift the engine hood assembly Fig 1328 DSC 0589 TX420 TX425 Series Service Manual Rev 001 8 53 DRIVE SYSTEM 5 Remove the spring from the idler arm Fig 1329 7 Remove left hand engine panel Fig 1331 Fig 1329 PICT 7642 Fig 1331 DSC 3307a 6 Remove the belt from the pulleys Fig 1330 8 Open the rear chassis cover assembly 9 Use aratchet socket extension through the rear access area Fig 1332 and a wrench on the idler arm assembly Fig 1333 to remove the nut and bolt retaining the idler arm assembly to the loader tower assembly Fig 1330 DSC 0591 Fig 1332 DSC 3311 8 54 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 11 Inspect the pulley bearing and the two flange bush ings for any wear Fig 1335 Fig 1333 DSC 3318 Fig 1335 CLR DSC 3321 10 Remove the idler arm assembly from the unit Fig 1334 A Carriage Bolt F Flange Bushings 2 B Idler arm assembly G Mounting Spacer C Pulley H Washer D Nut Bolt E Nut TX420 amp 425 All Serial Numbers Idler Arm Assembly Installation 1 Install the idler arm assembly in the unit Fig 1336 Fig 1334 DSC 3319 Fig 1336 DSC 3319 TX420 TX425 Series Service Manual Rev 001 8 55 DRIVE SYSTEM 2 Using a ratchet socket extension through the rear 3 Close the rear chassis cover assembly access area Fig 1337 and a wrench on the idler arm assembly Fig 1338 tighten the bolt and nut 4 In
49. lic line located on the right valve with a 1 1 8 open end wrench Fig 1478 side of the right hydrostatic pump Do Not remove This line needs to be disconnected to have enough just loosen This is to allow you to swivel the other room to remove the left hydrostatic pump Install a end of the metal line out of the way when removing protective cap on the fitting and the hydraulic line and installing the left hydrostatic pump Fig 1476 Fig 1478 DSC 0847 Fig 1476 DSC 0844 19 Remove the two bolts and nuts retaining the hydro 17 Remove the top hydraulic line located on the top of static pump to the loader tower assembly Fig the left hydrostatic pump using a 15 16 open end 1479 wrench Fig 1477 Install a protective cap on the hydraulic line and on the hydraulic fitting Fig 1479 PICT 7645 Fig 1477 CLR DSC 0845 8 92 Rev 001 TX420 TX425 Series Service Manual 20 Carefully remove the hydrostatic pump by lowering it toward the battery compartment area and then out of the unit Fig 1480 Fig 1480 DSC 0853 21 To service the hydrostatic pump refer to the Hydro Gear BDP 10A 16A 21L Service and Repair Manual Toro form no 492 4789 or the Hydro Gear P Series Pumps Service and Repair Manual Form no BLN 52503 TX420 TX425 Series Service Manual A Oil inlet Rev 001 DRIVE SYSTEM Hydrostatic Pump Left Side Installation Prior to connecting the hydraulic lines the o rings
50. move the nut from the wheel motor shaft Fig 1267 TX420 200000100 230000999 TX425 220000100 240000299 Wheel Motor Removal Note This procedure can be used for the left or right wheel motor 1 Lift and securely support the unit Refer to Lifting Unit for Service page 8 2 2 Remove the track Refer to Track Removal as follows e TX420 page 8 4 e TX425 with a cast drive wheel page 8 13 e TX425 with drive sprocket wheel page 8 29 Fig 1267 DSC 0748 3 Set the park brake TX420 TX425 Series Service Manual Rev 001 8 37 DRIVE SYSTEM 6 Using a wheel puller remove the drive sprocket Fig 9 Remove the nine bolts retaining the rear chassis 1268 cover assembly Fig 1270 Note It may be helpful in removing the drive sprocket if heat is applied to the hub Fig 1270 DSC 0896 Fig 1268 PICT 8106 10 On the top left side remove the carriage bolt and nut retaining the fuel tank clamp Fig 12771 7 Unlatch and open the rear access cover 8 Remove the right and left rear counterweights Fig 1269 Fig 1271 DSC 0752 Fig 1269 DSC 0895 8 38 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 11 Remove the rear chassis cover assembly Fig 13 Remove the hose clamp securing the fuel line to 1272 the fuel tank Remove the fuel line and slide the fuel tank out of the frame Fig 1274 Fig 1272 DSC 0897 Fig 1274 DSC 0763 12 Remove the two wires on the fu
51. n tube B Tensioning screw D Tension wheel Fig 1145 DSC 0606 Make sure the loader arms are raised Begin re moving the track at the top of tension wheel lifting up on the track to remove the slack from the bottom 3 Using a 1 2 drive ratchet release the drive tension Fig 1148 by turning the tensioner bolt clockwise until the tensioning nut contacts the tensioner bolt head Push the tension wheel toward the rear of the unit Fig 1146 and Fig 1147 Fig 1148 DSC 0608 Fig 1146 DSC 0607 TX420 TX425 Series Service Manual Rev 001 8 5 DRIVE SYSTEM 5 Start working the track off the front tension wheel 7 Remove the track off the rear drive wheel Fig while rotating the track forward Fig 1149 1151 1 AAAA Fig 1149 DSC 0609 Fig 1151 DSC 0611 6 Use a pry bar to help assist in removal of the track TX420 All Serial Numbers Fig 1150 Tensioner Wheel Bearing Replacement Note The tensioner arm could have a square or round tube This procedure is the same for both 1 Remove the tensioner arm assembly out of the frame Fig 1152 square tube or Fig 1153 round tube Fig 1150 DSC 0610a Fig 1152 CLR DSC 1724 8 6 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 3 Support the tensioner wheel so there is a space under it for bearing removal Using a hammer drive the upper bearing down to create a gap between spacer and bearing then use a drift punch to ham m
52. o secure the right hand panel to the control panel assembly Fig left hand panel to the control panel assembly Fig 1458 1460 Fig 1458 PICT 1413 Fig 1460 PICT 1415 TX420 TX425 Series Service Manual Rev 001 8 87 DRIVE SYSTEM 19 Install right hand panel Fig 1461 21 Start the engine set the park brake e Cycle loader valve to raise and lower lift and tilt cylinders e Stroke the drive handle forward and back until the track drive is smooth and consistent e Check for leaks 22 Install rear cover Fig 1463 Fig 1461 PICT 1414a 20 Using a 3 8 socket install 4 screws to secure the right panel to control panel assembly Fig 1462 Fig 1463 PICT 1026 TX420 amp 425 240000300 amp lower Hydrostatic Pump Left Side Removal Note Left pump drives the right side wheel motor Note Cleanliness is a key factor in a successful repair of any hydrostatic system Thoroughly clean all exposed surfaces prior to any type of maintenance Cleaning all parts by using a solvent wash and air drying is usually adequate As with any precision equipment all parts must be kept free of foreign material and chemicals Protect all exposed sealing areas and open cavities from damage and foreign material Fig 1462 PICT 1413 Upon removal all seals o rings and gaskets should be replaced During installation lightly lubricate all seals o rings and gaskets with clean petroleum jelly prior to assembly 8
53. o the frame to 150 15 ft lbs 203 20 Nm Fig 1159 Fig 1157 CLR DSC 0811 Fig 1159 CLR DSC 0814 8 8 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 4 Install compression spring and the bolt tensioner TX420 All Serial Numbers with tensioning nut Track Guide Removal Note Make sure the tensioning nut is contacting the bolt tensioner Fig 1160 1 Raise and securely support the unit Refer to Lifting Unit for Service on page 8 2 2 Remove the track Refer to Track Removal on page 8 4 3 Position a hydraulic floor jack and a suitable board under the track guide Fig 1162 Fig 1160 CLR DSC 0815 A Tensioning nut C Compression spring B Tensioning bolt D Tension Arm 5 Install the tensioner assembly into the frame Fig 1161 Fig 1162 DSC 0616 4 Remove the four bolts holding the track guide to the frame Fig 1163 Fig 1161 CLR DSC 1724 Fig 1163 DSC 0617 TX420 TX425 Series Service Manual Rev 001 8 9 DRIVE SYSTEM 5 Lower the track guide from the frame Fig 1164 1 With a hydraulic floor jack and a board to support the track guide raise the track guide up to the frame Fig 1166 Note Remove the tensioner arm for easier access to the inner bolts Fig 1164 DSC 0618 TX420 All Serial Numbers Fig 1166 DSC 0621 Track Guide Installation Note The track guide end with the step is mounted 2 Loosely install the four bolts that hold the tr
54. rews in the threaded to the crankshaft pulley Fig 1496 Once aligned holes of the pulley Fig 1494 tighten the 3 screws in the pulley Fig 1494 CLR DSC 0860 Fig 1496 DSC 0892 15 Install the pulley on the hydrostatic pump shaft 17 Once the pulleys are aligned tighten the 3 pulley aligning the key into the slot in the bushing Fig screws using a 7 16 socket Fig 1497 1495 Start the screws into the pulley Do Not tighten the screws at this time Fig 1497 DSC 0861 Fig 1495 DSC 0861 TX420 TX425 Series Service Manual Rev 001 8 97 DRIVE SYSTEM 18 Install the drive belt around the hydrostatic pulley 23 Install the left hand panel and retain it with 4 screws Recheck and tighten the 3 pulley screws Fig 1498 Fig 1500 Fig 1498 DSC 0826 Fig 1500 DSC 0829 19 Install the battery and battery clamp Connect the 24 Check the traction control for neutral refer to Trac positive and then the negative battery cable tion Control Neutral Adjustment on page 12 27 20 Start the unit and purge the system refer to Purging 25 Check and fill the hydraulic tank Refer to Checking Air Procedures on page 12 27 the Hydraulic Fluid on page 3 4 21 Check all the hydraulic line connections for any 26 Close the rear back cover and the hood leaks 2 Lower the unit to the ground 22 Install the right hand panel and retain it with 4 screws Fig 1499 Fig 1499 CLR DSC 0843 8 98 Rev 001 TX
55. stall the left hand engine panel Fig 1339 Fig 1337 DSC 3311 Fig 1339 DSC 3307a 5 Install the belt on the pulleys Fig 1340 Fig 1338 DSC 3318 Fig 1340 DSC 0591 8 56 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 6 Install the idler spring on the idler arm assembly TX420 amp 425 230000999 amp lower Fig 1341 Traction Control Handle Assembly Removal 1 Open the rear cover assembly 2 Remove the bolt and nut retaining the control handle assembly to the drive rod assembly Fig 1343 Fig 1341 PICT 7642 7 With a spring removal tool connect the tool to the spring end and hook it to the stud located on the loader tower assembly Fig 1342 Fig 1343 DSC 3658 3 Remove the 4 screws retaining the reference bar to control panel assembly Fig 1344 Fig 1342 DSC 0587 8 Close the engine hood assembly Fig 1344 DSC 3659 TX420 TX425 Series Service Manual Rev 001 8 57 DRIVE SYSTEM 4 Remove the reference bar and control handle as 6 Remove the bolt spacer and nut in the rod end sembly Fig 1345 bearing of the right side linkage rod connecting to the drive rod assembly Fig 1347 Fig 1345 DSC 3660 Fig 1347 CLR DSC 3666 5 Remove the center panel assembly Fig 1346 7 Remove the bolt spacer and nut in the rod end bearing of the left side linkage rod connecting to the drive rod assembly Fig 1348 Fig 1346 CLR DSC 3662 Fig 1348 DSC 3
56. the filter Fig 1421 Fig 1419 PICT 1415 Fig 1421 PICT 1457a TX420 TX425 Series Service Manual Rev 001 8 77 DRIVE SYSTEM B Right pump case drain hose Fig 1422 D Hydraulic hose running from the D port on the hydrostatic pump to the upper fitting on the right wheel motor Fig 1424 Fig 1422 PICT 1459 Fig 1424 PICT 1462 C Case drain line returning to the hydraulic oil tank Fig 1423 E Hydraulic hose running from the E port on the hydrostatic pump to the lower fitting on the right wheel motor Fig 1425 Fig 1423 PICT 1459 Fig 1425 PICT 1462 8 78 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM F Hydraulic hose running from the F port on the B Right pump case drain line Fig 1428 right side pump to the lower fitting on the left wheel motor Fig 1426 Note A 7 8 wrench may need to be used to hold the fitting while loosening the hydraulic line Fig 1426 PICT 1483 Fig 1428 PICT 1459 2 Using a 15 16 wrench disconnect the left hand hydraulic pump lines just marked as follows C Case drain line returning to the hydraulic oil tank A Hydraulic oil inlet from the filter Fig 1427 Fig 1429 Fig 1427 PICT 1463a Fig 1429 PICT 1465 TX420 TX425 Series Service Manual Rev 001 8 79 DRIVE SYSTEM 3 Using a 1 1 8 wrench disconnect the remaining F Hydraulic hose running from the F port on the left hand hydrostatic pump lines
57. to the frame with the ports facing up Rotate wheel motor 90 so the hydraulic ports are facing to the rear Fig 1221 Fig 1223 DSC 0690 Fig 1221 DSC 0684 TX420 TX425 Series Service Manual Rev 001 8 25 DRIVE SYSTEM 5 With a 1 1 16 socket install the hydraulic fittings to 7 Connect the fuel line to the fuel tank and install the the motor Fig 1224 hose clamp Fig 1226 Note Before installing the fuel tank in the unit disengage the park brake and start the unit Refer to Purging Air Procedures on page 12 27 Check for any leaks in the hydraulic fittings and hydraulic hoses Fig 1224 DSC 0682 6 Reconnect the two hydraulic lines using a 1 1 8 15 60 offset open end wrench Fig 1225 Fig 1226 PICT 1716 Note To ease installation connect the bottom hydraulic line first 8 Slide the fuel tank into the frame of the unit Fig 1227 Fig 1225 DSC 0901 Fig 1227 DSC 0691 8 26 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 9 Connect the two wires to the fuel sender Fig 1228 11 Install the left and right rear counterweights Fig 1230 Fig 1228 DSC 0672 Fig 1230 PICT 0549 A Center terminal B Right terminal orange wire black wire 12 Install the LH rear cover support assembly with 3 bolts Fig 1231 10 Install the rear chassis cover with eight bolts torque the bolts to 75 ft lbs 101 7 Nm Fig 1229 Fig 1231 DSC 0669 Fig 1229 DSC 0
58. ump lever assembly Fig 1471 Fig 1469 DSC 0829 Fig 1471 CLR DSC 0835 8 90 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 12 Tag or mark the RH hydraulic line so when you 14 Remove the hydraulic hose from the T fitting located re install the hydraulic line the correct one will on the right side of the hydrostatic pump using a be connected to the right port of the hydraulic 15 16 open end wrench Fig 1474 Place a pro pump Remove the right hand hydraulic hose from tective cap on the hydraulic hose the bottom of the hydrostatic pump with a 1 1 8 15 60 offset open end wrench Fig 1472 Place a protective cap on the hose and on the hydraulic fitting on the hydrostatic pump Fig 1474 CLR DSC 0841 Fig 1472 DSC 0877 15 Locate the metal hydraulic line going to the T fitting on the right side of the hydrostatic pump Remove it using a 15 16 open end wrench Fig 1475 Install a protective cap on the metal hydraulic line 13 Remove the left hand hydraulic hose from the bot tom of the hydrostatic pump using a 1 1 8 15 60 offset open end wrench Fig 1473 Place protective caps on the hose and the hydraulic fitting on the hydrostatic pump Fig 1475 CLR DSC 0842 Fig 1473 DSC 0840 TX420 TX425 Series Service Manual Rev 001 8 91 DRIVE SYSTEM 16 With a 15 16 15 60 offset open end wrench 18 Remove the hydraulic return line on the auxiliary loosen the metal hydrau
59. y from the 12 Carefully remove the hydrostatic pump from the hydrostatic pump shaft Fig 1438 tower assembly by lowering it down and out at the battery box location Fig 1440 Note The seal strip on the engine baffle may have to be removed from the baffle to allow for the Note The disconnected hydraulic lines may need to 2 jaw puller be moved out of the way to remove the pump Fig 1438 PICT 5627 Fig 1440 PICT 1482 11 Using a 3 4 wrench and socket with a swivel or 13 To service the hydrostatic pump refer to the Hydro universal joint remove the 2 bolts securing the Gear BDP 10A 16A 21L Service and Repair hydrostatic pump to the tower Fig 1439 Manual Toro form no 492 4789 or the Hydro Gear P Series Pumps Service and Repair Manual Form no BLN 52503 Hydrostatic Pump Installation Left Side Prior to connecting the hydraulic lines the o rings should be replaced with new ones and lightly lubricated with oil Fig 1439 PICT 1475 8 82 Rev 001 TX420 TX425 Series Service Manual DRIVE SYSTEM 1 When installing a new hydrostatic pump make sure Note Use the previously installed lower bolt and all the fittings are installed properly Fig 1441 nut to help support the pump while installing Fig 1443 Fig 1441 PICT 1480a Fig 1443 PICT 8061 A Oil inlet D Wheel motor 2 B Case Drain E Pump bypass C Check valve 2 4 Loosely install the upper bolt and nut to hold the pump in position

DRIVE SYSTEM

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