Service Manual
Contents
1. ForA For A Growing World World MTD Service Manual Model 31AS6BN2711 Two Stage Snow Thrower NOTE These materials are for use by trained technicians who are experienced in the service and repair of outdoor power equipment of the kind described in this publication and are not intended for use by untrained or inexperienced individuals These materials are intended to provide supplemental information to assist the trained technician Untrained or inexperienced individuals should seek the assistance of an experienced and trained professional Read understand and follow all instructions and common sense when working on power equipment This includes the contents of the product s Operators Manual supplied with the equipment No liability can be accepted for any inaccuracies or omission in this publication although care has been taken to make itas complete and accurate as possible at the time of publication However due to the variety of outdoor power equipment and continuing product changes that occur over time updates will be made to these instructions from time to time Therefore it may be necessary to obtain the latest materials before servicing or repairing a product The company reserves the right to make changes at any time to this publication without prior notice and without incurring an obligation to make such changes to previously published versions Instructions photographs and illustrations used in this publication are2. Track Tires GENERAL INFORMATION The Owner s Manual packet includes and engine man ual extra shear pins and cotter pins as well as a packet containing a sample of Sta Bill fuel stabilizer that will treat up to 2 1 2 gallons of regular gas CAUTION When assembling the handle for the first time use caution when lifting the handle The shift lever rod can get caught on the lower handle cross member and if forced into position can bend the spring shift lever If necessary move the shift rod in front of the cross member as you raise the handle into position There are two Supplement Sheet dated July 19 2004 and July 20 2004 Subject Connector Sleeve on Two Stage Snow Thrower shift rod Styles E F H K L N O P and Q Vibration may cause the rod connector sleeve to slide up out of position The remedy is to slide the connecter sleeve fully down Secure it in place by placing a rubber bushing over the top of the lower shift rod OR the upper shift rod A small piece of gas line can be used as a bushing This will prevent the sleeve from sliding up the shaft See Figure 1 Rubber Bushing Connecter Sleeve Figure 1 Rubber bands hold the Auger and Drive control cables in their respective nylon pulleys during shipping and generally break during assembly of the handle Remove any pieces of rubber band after assembly There is a storage area in the handle panel used for holding the spare auger shear pins S
3. Flange Bearing Hex flange bearings are used at the ends of the auger axle See Figure 41 ep d WT Spiral a Figure 41 There a four shear pins used to attach the spiral assemblies to the auger axle Spare pins are shipped with the unit See Figure 42 Ra E ET a Figure 42 Spiral assemblies are marked left and right for proper installation NOTE During assembly place the auger hous ing face up when installing the auger and impel ler assembly REDUCER TRANSMISSION The reducer can be serviced It can also be pur chased as an assembly NOTE On the top of the gearbox is inspection and access hole for adding grease when and if required Remove the rubber grommet from the lubrication port See Figure 43 o ZS ane Reducer Ke Vu IP de BS e Ass EE ZE aa ear 8 rte pe SS Ken Figure 43 20 REDUCTION TRANSMISSION DISASSEMBLY 20 1 Using a 3 8 socket remove the 5 self tapping screws securing the reducer halves together See Figure 44 Figure 44 20 2 Separate the housing halves using a putty knife See Figure 45 20 3 Inspect all internal parts for wear or damage NOTE before assembly clean off all of the ultra gray sealant on both sides of the gearbox hous ing Use ultra gray to reseal the housing before assembly 21 AUGER IDLER ARM 21 1 Split the unit See SPLITTING THE UNIT Sec tion 21 2 Remove the auger pulley See AUGER PULLEY
4. for reference use only and may not depict actual model and component parts Copyright 2005 MTD Products Inc All Rights Reserved MTD Products LLC Product Training and Education Department FORM NUMBER 769 01420 9 2004 SERVICE MANUAL 31AS6BN 711 Snow Thrower Tire Pressure CMTS TS HE OI EE 2 Discharge CUTE REMOVA arsta a a 2 Directional ele de un e EE 2 Chute Bracket AGIUS dn EE 2 Skid Shoe and Shave Plate Adjustment cee cecccceecceeeceeeceaeceaeeseeeceeecseseeeesaeeseneessuesaeeeaes 2 The Shave Plate Adustment ces eesaeeceaeceeeesaeesaeeseeeseueseeeesaeesaeeseesaas 3 Drive Control Cable el EE E 3 Auger Control Testing and Adiustment 4 SHM Kee el Ed E EE 5 Auger BEI REDIGCEMGNN EE 5 Drive Belt Replacement 20 0 cceccecccecceeceeteeeceeceeeaeeesececseeceeceesesseesaesaeeeeecseseesseceeseeseeseeeeaes T Seiler ne EE T AIC OPAL REMOYA UE 9 SPIUNOI aoe a EE 10 Friction WWNee DISC DISASSEMDLY fuensecassecendsnnseatdanevaxoaatdannsnesves sdecanendaasanaacacemarsesadansencareaenaediaenss 11 Auger PUEY REMOVA EE 11 AUGEr ANG mMpeler Ge EE 12 Reducer EE ege Ee EE 13 Reduction Transmission RTE e EEN 14 PRACT TONG ATN EE 14 Chute DISaSSeMmDIV AAA 15 SERVICE MANUAL 31AS6BN2 711 Snow Thrower 31AS6BN2711 TROY BILT AS SPECIFIED FOR LOWE S SNOW THROWER MODEL NUMBER 31AS6BN2711 SERIAL 16144B40028 e Two Stage 5 5 HP Electric Start e 24 Clearing Width 6 Forward Speeds and 2 Reverse Speeds e X
5. the cable over the roller See Figure 27 a Figure 27 14 5 You can now easily remove the drive cable spring from the support bracket 14 6 Remove both E cl 9s from the axle shaft See Figure 28 Sa E Clip 3 E Clip nhs S Ae e vi i ai iia AN V N gt A s y e ch nr a H f Ze WR Figure 28 14 7 Slide the axle shaft to left to allow 44T gear to slide off the key See Figure 29 o E a Figure 29 14 8 Remove key from the shaft 14 9 Continue to slide axle shaft to the left as you remove the components from the axle shaft NOTE Maintain correct order of parts 14 10 Reassemble the components in reverse order 15 SPLITTING THE UNIT Splitting the unit in two allows easy access to the fric tion disk and auger pulley This is the preferred method of servicing these parts 15 1 Drain the gasoline from the snow thrower or place a piece of plastic under the gas cap 15 2 Disconnect the spark plug wire from the spark plug 10 15 3 Remove the hairpin clip securing the chute crank assembly to the chute crank bracket See Figure 30 Washer AN pe 7 aa Fe ce NW li ele gt Figure 30 15 4 Remove the washer and slide the crank assem bly from the bracket 15 5 Using a 3 8 socket and extension remove the two self tapping screws securing the plastic belt cover to the frame 15 6 Remove the auger bel
6. NNN SE RS E m D 4 Figure 17 11 8 Using a 9 16 socket and a wrench loosen and remove the shoulder screw which acts as a belt keeper 11 9 Move the idler arm belt brake to the right as you remove the belt from around the auger pulley and slip the belt between the support bracket and the auger pulley See Figure 18 ffr A D re H i Figure 18 11 10 Reassemble auger belt by following instructions in reverse order IMPORTANT Do NOT forget to reinstall the shoulder screw and reconnect the spring to the frame after installing a replacement auger belt 12 DRIVE BELT REPLACEMENT To remove and replace your snow thrower s auger belt proceed as follows 12 1 Follow steps 11 1 trhough 11 6 in the AUGER BELT REPLACEMENT Section 12 2 Use a length of starter cord to pull the idler pul ley toward the right away from the belt 12 3 Wedge a piece of wood under the pulley to hold it in position See Figure 19 Ps CG Zei a idler Pulley H s Zi GC d d Starter Cord Figure 19 12 4 Roll the drive belt off engine pulley 12 5 Roll the drive belt off the pulley and between fric tion wheel and friction wheel disc See Figure Friction Wheel Disc Figure 20 12 6 Replace belt in the reverse order 13 FRICTION WHEEL REMOVAL If the snow thrower fails to drive with the drive control engaged and performing the drive control cable adjustment fails to correct the problem the frict
7. REMOVAL Section 21 3 Align one of the holes in the impeller with the idler arm nut on the front of the auger housing See Figure 46 Figure 46 21 4 Using a 9 16 socket on a long extension and a 22 5 Using a 7 16 socket remove the four flange 15 16 socket on a ie socket wrench remove lock nuts and washers securing the chute the nut and shoulder screw attaching the idler adapter to the auger housing See Figure 48 bracket to the auger housing 21 5 Inspect the idler pulley for wear or damage NOTE The idler pulley can be removed using a 9 16 socket and a 9 16 opened end wrench 22 CHUTE DISASSEMBLY 22 1 Using a screwdriver pry open the three flange keepers securing the lower chute to the chute adapter See Figure 47 aber al Figure 48 NOTE Use caution when removing the nuts The carriage screws are not attached to the auger housing 22 6 Lift off the chute adapter H Flange Keeper Figure 47 22 2 Lift off the lower chute 22 3 Remove the hairpin clip securing the chute crank assembly to the chute crank bracket 22 4 Remove the washer and slide the crank assem bly from the bracket 15
8. airpin clip which secures the ferrule to the shift lever See Figure 11 er portion of shift lever Shift Rod WS f Figure 11 Ferrule 10 2 Rotate the shift arm clockwise as far as it will go See Figure 12 Figure 12 10 3 Thread the ferrule up or down the shift rod until it aligns with the hole in the shift lever 10 4 Re secure the ferrule with the hairpin clip removed earlier 11 AUGER BELT REPLACEMENT 11 1 Using a 3 8 socket and extension remove the two self tapping screws securing the plastic belt cover to the frame See Figure 13 Figure 13 11 2 Drain the gasoline from the snow thrower or place a piece of plastic under the gas cap 11 3 Disconnect the spark plug wire from the spark plug See Figure 14 Plastic under gas Cape Spark Plug S 4 ec 7 ae a el X A ab SS WA r VDL N a VW A A K Figure 14 11 4 Carefully pivot the snow thrower up and forward so that it rests on the auger housing 11 5 Using a 3 8 socket remove the four self tapping screws which secure the frame cover to the frame See Figure 15 Figure 15 11 6 Roll the auger belt off the engine pulley See Fig ure 16 mi LF kb Figure 16 11 7 Using a piece of starter cord unhook the support bracket spring from the frame See Figure 17 wT i bzw d VS La ShouldesScrew and Nut EI SEL e i wl E y WII UI de II II Ww
9. e bottom of the directional control is not fully engaging the chute assembly 5 1 Loosen the two nuts which secure the chute bracket and reposition it slightly before retighten ing the nuts See Figure 5 Figure 5 6 SKID SHOE AND SHAVE PLATE ADJUST MENT The space between the shave plate and the ground can be adjusted For close snow removal on a smooth surface raise skid shoes higher on the auger housing to lower the shave plate Use a middle or lower position when the area to be cleared is uneven such as a gravel driveway CAUTION Loose gravel can be picked up and thrown by the auger causing injury to the opera tor and bystanders and or damage to the snow thrower and surrounding property For initial adjustment we recommend placing the shave plate on a piece of cardboard 6 1 Loosen the four hex nuts two on each side and carriage bolts attaching the skid shoes to the auger housing See Figure 6 ye Hex Nuts JN ch Figure 6 6 2 Move the skid shoes to the ground 6 3 Tighten the hex nuts NOTE Make certain the entire bottom surface of skid shoe is against the ground to avoid uneven wear on the skid shoes T SHAVE PLATE REMOVAL The shave plate will wear over time It can be replaced as needed NOTE You will need to remove the skid shoes in order to remove the shave plate 7 1 Remove the carriage bolts and hex nuts which attach it to the auger housing 7 2 Reass
10. ee Figure 2 Figure 2 1 TIRE PRESSURE Before operating check tire pressure Both tires should be between 15 psi and 20 psi NOTE If the tire pressure is not equal in both tires the unit may pull to one side or the other during operation 2 CHUTE INSTALLATION 2 1 Apply a light lubricant to the rim lip of the chute base and the underside of the chute assembly and position the chute over the base 2 2 Close the flange keepers to secure the chute to the base See Figure 3 Thirg flange keeper is E Open flange K NOTE If the flange keepers will not easily click into place use the palm of your hand to apply swift firm pressure to the back of each DISCHARGE CHUTE REMOVAL 3 1 To remove the discharge chute use the blade side of a screwdriver by wedging between the housing and the flange keepers and with a lifting and prying motion lift the locking flange out of the locked position and pivot the flange keepers outwards 3 2 Lift the chute assembly off the mounting base of the main housing DIRECTIONAL CONTROL ASSEMBLY 4 1 Remove the flat washer and hairpin clip from the end of the chute directional control 4 2 Insert the end of the chute directional control into the lower bracket and secure with the flat washer and hairpin clip See Figure 4 Directional Control Lev r j Si Figure 4 5 CHUTE BRACKET ADJUSTMENT If necessary the Chute Bracket can be adjusted if the spiral at th
11. emble the new shave plate making sure the heads of the carriage bolts are to the inside of the housing Tighten securely See Figure 7 Figure 7 8 DRIVE CONTROL CABLE ADJUSTMENT When the drive control is released and in the disen gaged or up position the cable should have very little slack It should NOT be tight Check the adjustment of the drive control as follows 8 1 With the drive control released push the snow thrower gently forward The unit should roll freely 8 2 Engage the drive control and gently attempt to push the snow thrower forward The wheels should not turn The unit should not roll freely 8 3 With the drive control released move the shift lever back and forth between the R2 position and the F6 position several times There should be no resistance in the shift lever If any of the above tests failed the drive cable is in need of adjustment 8 4 8 5 9 1 9 2 9 3 Loosen the hex jam nut on the auger control cable Z fitting and rotate the coupling end of the cable downward to provide more slack or upward to take up slack See Figure 8 Jam Nut Drive Control Cable Figure 8 Retighten the hex jam nut and repeat all three tests to verify proper adjustment has been achieved AUGER CONTROL TESTING AND ADJUST MENT Start the engine and run it at full throttle While standing in the operator position engage the auger Do this several times Release the auger c
12. ex shaft Follow the steps above in ke D gt reverse order to reassemble components If you re disassembling the friction wheel and replacing only the rubber ring proceed as follows 13 10 Remove the four screws that secure the friction j Inner E Ring wheel s side plates together See Figure 25 Rubber Friction Wheel Friction Plate Figure 23 NOTE Maintain the correct order of parts during disassembly Friction Wheel Hub Self Tapping Screws Figure 25 13 11 Remove the rubber ring from between the plates 13 12 Reassemble the side plates with a replacement rubber ring IMPORTANT Tighten each screw only one rota tion before turning the wheel clockwise and pro ceeding with the next screw Repeat this process several times to ensure the plates are secured with equal force 13 13 Slide the friction wheel assembly back onto the hex shaft and follow the steps above in reverse order to reassemble components 14 AXLE SHAFT REMOVAL 14 1 Follow steps 11 1 through 11 5 in the AUGER BELT REPLACEMENT Section 14 2 Using a e socket remove the screws and bell washers securing the wheels to the axles Remove both wheels 14 3 Remove the extension spring from friction wheel support bracket See Figure 26 d e Friction Wheel Suport Bracket Extension Spring Figure 26 14 4 Use a 7 16 socket and back off the screw secur ing the cable roller to the guide bracket Do not remove the screw Slip
13. ion wheel may need to be replaced 13 1 Examine the friction wheel for signs of wear or cracking and replace if necessary 13 2 Place the shift lever in third Forward F3 posi tion 13 3 Follow steps 11 1 through 11 5 in the AUGER BELT REPLACEMENT Section 13 4 Using a e socket remove the screws and bell washers securing the wheels to the axles Remove both wheels 13 5 Using a suitable tool carefully remove the outer E ring which secures the hex shaft to the snow thrower frame and lightly tap the shaft s end to dislodge the ball bearing from the right side of the frame See Figure 21 Be K NN je l Te Pm Zone VEH l E Clip om G RB 1 Ge A Screwdriver Figure 21 13 6 Slide the hex shaft to the left while carefully un 13 9 Inspect the friction wheel and all components of meshing the lower gears on the hex shaft from the hex shaft for any wear or damage See Fig the upper gears on the wheel axle See Figure ure 24 Flat Washer Friction Wheel 16 44 Gear Y Hex Shaft Ball Bearings Figure 24 Figure 22 NOTE The friction wheel can be replaced as an 13 7 Set the hex shaft s gears aside assembly or repaired 13 8 Carefully remove the inner E ring from the hex If you re replacing the friction wheel assembly as a shaft and slide the friction wheel assembly off whole discard the worn assembly and slide the new the hex shaft See Figure 23 assembly onto the h
14. ontrol and walk to the front of the unit Confirm that the auger has com pletely stopped rotating and shows NO signs of motion IMPORTANT If the auger shows ANY signs of rotating immediately return to the operator s position and shut off the engine Wait for ALL moving parts to stop before re adjusting the auger control 9 4 To readjust the control cable loosen the hex jam nut on the auger control cable Z fitting Rotate the coupling end of the cable counterclockwise to provide more slack Retighten the hex jam nut See Figure 9 Jam Nut Auger Control Cable Figure 9 9 5 Repeat Auger Control Test to verify proper adjustment has been achieved WARNING Never attempt to make any adjust ments while the engine is running except where specified in operator s manual The augers are secured to the spiral shaft with two shear pins and cotter pins If the auger should strike a foreign object or ice jam the snow thrower is designed so that the pins may shear See Figure 10 A Figure 10 If the augers will not turn check to see if the pins have sheared One set of replacement shear pins has been provided with the snow thrower When replacing pins spray an oil lubricant into shaft before inserting new pins 10 SHIFT ROD ADJUSTMENT If the full range of speeds forward and reverse cannot be achieved adjust the shift rod 10 1 Place the shift lever in the fastest forward speed position and remove the h
15. t from around the engine pulley 15 7 Using a 3 8 socket remove the hex screw attaching the front auger cable guide bracket to the left side of the frame See Figure 31 A EE Figure 31 15 8 Unhook the extension spring from the auger drive idler bracket 15 9 Using ae socket remove the four hex screws and bell washers securing the auger housing assembly to the frame 15 10 Tip the handles back to allow separation of the auger housing from the frame See Figure 32 VAN e bh T t ef ey C hg d d 4 De e af ge n e g We S ar e All 5 SE em Gs IT H 8 E E 2 as w me WEE a E Figure 32 16 FRICTION WHEEL DISC DISASSEMBLY 16 1 Split the unit in two See SPLITTING THE UNIT Section 16 2 Tip the handles down towards the ground and rest them on 4x4s in order to not bend the shift lever 16 3 Use a piece of starter cord to take tension off the friction wheel drive belt See Figure 33 Figure 33 16 4 Remove the drive belt from around the engine pulley 11 16 5 Using a screwdriver and 9 16 wrench remove the jam nut and bell washer securing the friction wheel to the support bracket See Figure 34 Figure 34 16 6 Remove the friction wheel from the bracket See Figure 35 Figure 35 NOTE Be aware of hole location during asem bly Use the hole on the right side as you face the unit when installing the friciton wheel Use Locktite on
16. the nut during assembly 17 AUGER PULLEY REMOVAL 17 1 Split the unit in two See SPLITTING THE UNIT Section 17 2 Wedge a 2x4 between the spiral assembly and the auger hosing to hold it in place 17 3 Using a 1 2 socket remove the screw and flat 18 3 Using a i socket remove the two flange lock washer securing the auger pulley to the impeller nuts securing the bearing housing to the auger assembly See Figure 36 housing Remove the bearing housing and bear T ing and inspect for wear or damage See Figure Sf e 17 4 Inspect the pulley and adapter for any wear or Figure 37 damage NOTE The two carriage bolts used to secure the bearing housing are held in place by push on nuts NOTE During reassembly use Loctite 242 on the screw NOTE Torque to 160 200 inch pounds 1s AUGER aN ee 18 5 Using a 1 2 socket remove the four two on 18 1 Split the unit in two See SPLITTING THE UNIT each side hex screws securing the auger Section assembly to the auger housing See Figure 38 18 2 Remove the Auger Pulley See AUGER PULLEY REMOVAL Section 18 4 Lay the auger housing on its face Figure 38 12 18 6 Carefully tip back and remove the housing from the auger assembly See Figure 39 d Figure 39 AUGER AND IMPELLER NOTES e e The impeller worm shaft is machined to match a double D machining in the impeller See Figure 40 Figure 40 19 19 1 13 Cotter Pin Hex
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