Hub Service Manual.pmd
Contents
1. viced immediately Checking for End Play FIGURE 8 Consolidated Metco Inc 7 HUB REMOVAL AND DISASSEMBLY Never work under a vehicle supported by a jack without supporting the vechicle with stands and blocking the wheels 1 Prepare the axle for disassembly by using a jack to raise the axle until the wheels are off the ground and the axle is properly supported Care should be taken to avoid damaging the hub or other components If you plan to replace the brake drum i e cast in place of Removing the Drive Axle Shaft Centrifuse or wheels i e aluminum in place of steel FIGURE 11 measure stud standout see figure 9 In hub piloted mounting 3 Examine the spindle nut to determine the locking systems the studs must be long enough for the threads to be system and disengage the locking device exposed beyond the installed wheel nut In the ball seat mounting system the stud length beyond the brake drum should be from 1 31 1 44 as measured from the brake drum to the 4 Remove the spindle nut system see figure12 end of the stud Call ConMet at 1 800 547 9473 for the correct stud part number for your application If you plan to replace the brake drum verify the new drum has the same drum pilot diameter as the one that has been removed Lirurn Typical Spindle Nut System FIGURE 12 5 Slide the hub off the spindle being careful to protect the outer bearing cone from falling Remove and save the2. 3 4 16 Drive Studs 5 8 18 40 60 Consult manufacturer s instructions for drive axle shaft installation 1 2 20 for all drive studs Hub Cap pi6 18 1218 SSCS 1 4 npt Oil Fill Plug 3 8 npt 20 25 9 16 18 O ring Style Disc Brake Rotor See breake manufacturer Inboard Brake Drum 175 200 PO 18 Consolidated Metco Inc SPECIFICATIONS Manual Wheel Bearing Adjustment Procedures TABLE 8 For best results check bearing adjustment with a magnetic base dial indicator that reads to the nearest 0001 Step 1 Lubricate the bearings with the manufacturer s recommended lubricant before proceeding with Step 2 Steps 2 6 Preliminary Bearing adjustment listed below T z Back Off of Adjustment Nut Jam Nut Torque Initial Torque on Initial Back Off on Final Torque on Adjusting Nut Adjusting Nut Adjusting Nut Axle Type aa OiNeh Ack vd les OF Torque J g J J J J YPE Per Inch Off Type q Steer font 18 1 4 turn Install cotter pin non drive 14 4 2tum Under 2 200 300 ib ft 18 5 8 12 200 Ib ft while 50 lIb ft while Dowell 300 400 Ib ft One full turn rotating hub rotating hub washer Drive 1 4 turn Tang 16 ang 200 275 lb ft washer eet 12 Taig turm 25 8 and 300 400 ib ft 16 over Step 7 Final Bearing Adjustment Trailer as l Bearing Adjustment Measure the preliminary bearing adjustment end play Spindle threads Per Chanae Per Nut Flat with a 0001 reading magnetic base dial indica
3. If you are working on a steer or trailer hub go to step 2 If you are working on a drive hub proceed as follows 1 For drive hub installation place the hub horizontal and remove the outer cone Fill the cavity through the end of the hub with the axle flange studs with as much oil as possible Reinstall the outer cone in the hub see figure 20 Reinstalling the Spindle Nut FIGURE 22 INSTALLING THE HUBCAP The hubcap bolt holes must be free of debris such as silicon gasket sealer to ensure the bolts will tighten properly to avoid leaks The vent should also be clean and free of debris Remove any burrs or sharp edges Always use new gaskets Prelubricating the Drive Hub FIGURE 20 1 Install the hubcap 2 For steer and trailer hubs mount the hub assembly onto the axle spindle with a smooth firm motion while holding the outer bearing in place Use care to maintain Use SAE Grade 5 bolts or stronger Do not use star washers or alignment between the bearing cones and spindle and split lock washers as they will allow contaminants to corrode the to avoid seal damage see figure 21 threads Use only flat washers with no locking features 2 Torque the hubcap bolts to 12 18 Ft eLbs using a star pattern If you are using semi fluid grease special procedures must be followed as outlined in the Semi Fluid Grease Lubricant section Mounting the Assembly FIGURE 21 Once the hub is on the spindle do not
4. decreased clamping load 4 Before installation of brake drums and wheels that utilize the hub piloted system rotate the hub so one of the wheel pilot bosses is at the top 12 o clock position see figure 28 Wheel Pilot Boss Rotating the Hub FIGURE 28 5 Position the brake drum over the hub so it seats on the drum pilot and against the hub face 6 Place the wheel s into position One or more nuts can be started in order to hold wheel s and drum into position 7 Tighten the top nut first Apply 50 Ft Lbs torque to draw the brake drum up fully against the hub see figure 29 Reinstalling the Wheel FIGURE 29 REINSTALLATION Excessive or inadequate wheel nut torque can result in a failure of the wheel mounting system After the first 50 100 miles ALCOA Cap Nut Number 5995 R and 5995 L or 5554 R and 5554L Aluminum Wheels 3 4 16 Threaded Studs retorque all the nuts to 450 500 Ft Lbs 8 Install the remaining wheel nuts and using the sequence as shown torque all the nuts to 50 Ft eLbs then retorque to 450 500 Ft Lbs see figures 28 29 The last nut rotation must be with a calibrated torquing device 9 Inspect the brake and wheel installation by checking the seating of the wheel s and drum at the pilots and by turning the wheel s and checking for any irregularity Ball Seat Wheel Mounting System Clean all mating surfaces on the hub drum wheels and nuts Remove loose pai
5. outer bearing cone Measuring Stud Standout FIGURE 9 2 Remove the wheels and brake drum see Figure 10 Occasionally the seal can become stuck on the spindle making the hub difficult to remove If mechanical assistance is required to remove the hub care should be used to avoid damage to hub components see figure 13 In some cases part of the seal will remain on the spindle When removing this portion of the seal care should be taken not to damage the spindle or seal journal Removing the Wheels FIGURE 10 Mechanical Puller FIGURE 13 If the hub to be disassembled is a drive hub remove the drive axle shaft and capture the oil see figure 11 8 Consolidated Metco Inc HUB REMOVAL AND DISASSEMBLY ConMet makes several tools to assist in the removal of hubs These tools are available for purchase and are listed in the back of this manual see tables 5 and 6 Inner Bearing 6 Place the hub on its outboard end and remove and san discard the seal if it does not need to be retained for warranty rembursement 7 Remove and save the inner bearing cone see figure 14 All components replaced under warranty must be returned for consideration of reimbursement Contact the OEM manufac Hub Disassembly turer for their warranty return policy FIGURE 14 Consolidated Metco Inc INSPECTION REPAIR AND REPLACEMENT BEARING CUPS AND CONES If a bearing cup or cone shows signs of deterioration replac
6. that neither their safety nor the safety of the product will be jeopardized by the service method selected Use only ConMet approved replacement parts Do not attempt to use damaged parts DISC WHEEL INSTALLATION PROCEDURES ConMet part number 103282 are available upon request Notes These activities include additional information that N onl may assist the technician in service procedures see figure 1 FIGURE 1 Cautions These activities indicate that product damage may result from failing to heed the stated advisory VAN 0710 T O N see figure 2 FIGURE 2 Warnings Associated activities indicate that personal injury may result from failing to heed the advisory see figure 3 ANTAVAN 4 N N G FIGURE 3 Dangers Associated activities indicate that death or serious personal injury may result from failing to heed the stated advisory DANN e R see figure 4 FIGURE 4 Consolidated Metco Inc 3 INTRODUCTION Consolidated Metco Inc is recognized as the leader in the design and manufacture of lightweight components for the heavy truck industry With the addition of ductile iron hubs to our family of products ConMet now offers com plete range of disc wheel hubs for heavy truck tractor and trailer applications For information on ConMet PreSet Hubs with pre adjusted bearings refer to the corresponding service manual see table 1 Contact ConMet at 1 800 547 9473 for other available technical or pr
7. 17 Replace the hub if the ABS ring seat is damaged Some hubs are configured so it is impractical to have supports to prevent the hub from tipping when force is applied to the stud In this case support the hub on wood blocks on the floor and use a heavy hammer to drive the studs out with several sharp blows Be careful to avoid damaging the hub and components particu NOTE larly the seal bore and the ABS tone ring For steer hubs be certain the inside diameter flange is facing up 4 Place the hub in a press and place the ABS ring on STUD REPLACEMENT the hub ring seat The ABS ring must be fully seated with a maximum of 0 008 axial runout to ensure the ABS system functions properly 5 Using ConMet ring installation tool part number On the ball seat wheel mounting system always use left handed 107119 center the tool over the ABS ring Each type of threaded studs on left handed hubs and use right handed so y threaded studs on right handed hubs E fits a corresponding diameter on the tool see figure The ConMet part number is located on the head of the stud The same part number must be used for replacement unless changing 6 Press the ring on the hub If a press is not available the drum or wheel type drive the ring on with a hammer or mallet until the ring 1 To install a new stud support the hub evenly around seats on the hub see figures 18 19 and adjacent to the stud being installed 2 Press the new
8. Hub Service Manual Manually Adjusted Bearings Steer Drive and Trailer Applications Table of Contents Important Reminders i ceca siete cusses oct ca cieyaed naiteeewet dione eda etanee aces consek ee 2 MU UC OA ceases oni EEEE E sac iuceasuceareaiauenetsedeseonceeess 3 YS TAS AON se epee ce cee eo de pass eects de ge A A eceteten E 4 Wheel Mounting Systems cccccsscccseeeeeeseeceeeeceseeeeeeeesnaeeenees 4 Hub Pilot Wheel Mounting System c cccceeeeeeeeeeees 4 Ball Seat Wheel Mounting System cccceseeeeeeeeees 4 Periodic Inspection and Preventative Maintenance ccccecceeeeeeeeeeees 5 Visual Inspection Oil Lubricated cccccececeeeeeeeeeeeeeeeesaeeees 5 Visual Inspection Semi Fluid Grease Lubricated 0008 5 Functional Checks oeenn naaa raa AEA E n aa 6 Hub Removal and Disassembly ccccccceeeeseeeceeeeeeeeeueeueeeeeueeaeeeseeeeaeees 7 8 Inspection Repair and Replacement ccccceccssccseeceeeseseceeeceeeeaeeeeees 9 Bearing Cups and Cones ccccccccsseecceeeeceeeeeceseeceueesseseesneessaes 9 CEE a e EE E E E ETT 10 SWd REMOVAL ieee eee nen ee nee iii i 10 Stud Replacement ec cenic adorn cesensncscles dvades eased ans ndatasasenconas 10 ABS Tone Ring AS Applicable ccccccecseeeeseeeeeeeeeeseeeeeeeeeeeees 10 11 Reinstallation a 5cicoctncenswece racic nateasmnraneaamate so toonumeneeoaneatewasamr nase m
9. If the cup is loose allow a few seconds for it to heat up and secure itself before moving the hub Bearing Cup Pressed into Hub FIGURE 16 6 Iron hubs do not need to be heated for bearing cup installation Press the bearing cup into the hub using the appropriate assembly aids WHEEL STUDS Replace all wheel studs that have damaged or distorted threads are broken or bent or are badly corroded Also replace both studs adjacent to the damaged stud If two or more studs have damage replace all the studs in the hub Broken studs are usually an indication of excessive or inadequate wheel nut torque Inspect the drum pilots wheel pilots and mounting face on the hub for damage A damaged drum pilot is usually caused by improper drum mounting A damaged wheel pilot could be the result of inadequate wheel nut torque allowing the wheels to slip in service Also inspect the wheels and brake drum for damage Consolidated Metco Inc INSPECTION REPAIR AND REPLACEMENT STUD REMOVAL Observe all warnings and cautions for press operation provided by the press manufacturer to avoid serious personal injury and damage to components 1 Place the clean hub in a shop press with the hub supported evenly around and adjacent to the stud being removed N WARNING Failure to adequately support the hub can result in physical injury and or damage to the hub 2 Press the stud out of the hub Using Pry Bar to Remove ABS Ring FIGURE
10. Under normal conditions the grease may darken slightly A white or milky appearance indicates water contamination If the inspection indicates contamination completely service the wheel hub by following the instructions in the manual NOTE Do not mix grease types If grease needs to be added make sure you use the same type of grease as installed by the OEM outlined in this manual N CAUTION Do not mix oil types If oil needs to be added make sure you use the same type of oil 6 Consolidated Metco Inc PERIODIC INSPECTION AND PREVENTIVE MAINTENANCE FUNCTIONAL CHECKS Measure End Play In addition to the Annual Inspection the following 1 Remove the hubcap and use a dial indicator with a functional checks should be done in conjunction with magnetic base mounted on the spindle end to read the brake or tire service travel at the hub cap mounting surface see figure 8 NOTE Conduct the following inspections with the wheel s and drum 2 Grasp two wheel studs across from each other and removed pull and push the hub while oscillating it AN WARNING 3 Measure the end play by the difference between the Never work under a vehicle supported by a jack without minimum and maximum dial indicator readings supporting the vechicle with stands and blocking the wheels Rotate the hub and check for free smooth and quiet CAUTION rotation If rotation is hampered hubs should be ser Hubs should be serviced if end play exceeds 0 000
11. ct the brake and wheel installation by checking the seating of the wheel s and drum at the pilots and by turning the wheel s and check for any irregularity Excessive or inadequate wheel nut torque can result in a failure of the wheel mounting system After the first 50 100 miles retorque all the nuts to 450 500 Ft e Lbs Always remove the load from the wheels by jacking the truck or trailer up when retorquing Loosen the outer nuts to retorque the inner nuts SPECIFICATIONS Service Parts List TABLE 4 Hub Description Bearing Number Hub Description Bearing Number Steer Axle ee ee 12 000 14 600 UN raer Ib GAWR pale TP Trailer RY Series Axle Drive Axle Assembly Aids Kit Part No 107525 TABLE 5 Pan No een NEUES Cup Eeo Outer NP Cup Ae Outer Dissembly Aids Kit Part No 107532 TABLE 6 ov Eana Cup A a e TN Outer Cup a Outer oe Wheel End Torque Specifications TABLE 7 Torque N Ft Ibs Ball Seat 3 4 16 Alwys tighten the top nut first If lubricant is used apply sparingly 450 500 on threads only Consult the wheel manufacturer for torque Wheel N 1 1 8 16 requirements Do not lubricate the faces of the hub drum wheel Ki j or on the ball seats of the wheel nuts Hub Pilot Alwys tighten the top nut first Apply two drops of oil between the 22 mm x 1 5 mm 450 500 ie and me cn ano two ean rai to oe 2or3 W heel Nut threads of the wheel studs Peed ubricate the wheel pilots on e hub
12. e the suspect part along with the mating component When reinstalling cups be certain they are pressed fully against their seats Use appropriate replacement parts see Table 4 1 Thoroughly clean and degrease all components with a nonflammable solvent 2 If required on an aluminum hub remove the bearing cup by welding a large bead around the bearing surface of the steel cup letting the assembly cool and removing the bearing cup see figure 15 Welding Bead FIGURE 15 On an iron hub remove the bearing cup using a large hammer and a heavy drift along with the appropriate cup knockout tool as listed in the back of this manual see table 6 Take precaution to avoid damaging the bearing cup bore and shoulder 3 Inspect the bearing cup bore for evidence of cup rotation Spun cups If noted replace the hub 4 To install a new cup in an aluminum hub it is recommended that the hub be heated evenly throughout in an oven or in boiling water to 175 215 F Cooling the cup in a freezer will further ease the installation if desired A N CAUTION Do not overheat the hub Remove the aluminum hub from the oven or water and carefully drop in the new bearing cup being certain it is fully seated Variations within tolerances of materials and oven temperatures may require the bearing cup to be pressed in to the hub see figure 16 using the appropriate assembly aids as listed in the back of this manual see table 5
13. ieeuses sedeeamanete se 12 Installing the Wheel Hub HUB ccccccsseeseeeseeeeseeeeeeeeseeeeees 12 Installing the Hubcap an cncnasictaaesstersuicasandecasidersaneiaduuinel naeeesdetdataudagass 12 OI TEMS IC ANA stoi sens seta Semen cio A E E 13 Semi Fluid Grease LUDrICAN cc cece ceecceeeeceeeeceeeceeeeseeeeeeeeseees 14 Brake Drums and Wheels ccccccsccceceeeceeeseseceeecueceeesssesaeenes 14 Hub Pilot Wheel Mounting System cscccseeeeeeeeees 14 15 Ball Seat Wheel Mounting System cccceeeeeeeeeeeeees 15 16 DS CIN CANONS oo sae ceccraccesianc cnet ebanteereesneenicenatueanemosnnelseneed wtehasennatsereeinaneaneee 18 2003 Consolidated Metco Inc IN one or toe AIMSted DUSTRIES Consolidated Metco Inc IMPORTANT REMINDERS Read this manual carefully providing extra attention to its explanations and instructions To ensure safe continuous trouble free operation understand your wheel hub system and keep all components in proper operating condition Pay particular attention to all NOTES CAUTIONS WARNINGS and DANGERS to avoid the risk of personal injury or property damage and realize these statements are not exhaustive ConMet cannot possibly know or evaluate all conceivable methods in which service may be performed or the possibly hazardous consequences of each method Accordingly those who use a procedure not recommended by ConMet must first satisfy themselves
14. nt scale and any material building around the pilots of the drum hub and wheels Be sure paint is fully cured on recently refurbished wheels When dual wheels are mounted the stud length beyond the brake drum standout should be from 1 31 1 44 as measured from the brake drum to the end of the stud see figure 30 When mounting dual aluminum wheels use ALCOA inner cap nuts 5978R and 5978L or the equivalent These nuts can also be used with longer studs up to 1 88 standout For special single aluminum wheel applications on drive and trailer hubs use ALCOA single cap nuts 5995R and 5995L or 5554R and 5554R and 5554L or the equivalent depending on the stud thread length see table 3 For single steel wheel applications use BATCO 13 3013R and 13 3013L or the equivalent see table 4 MG Brake ite Huh Dirun _ TAG Stud Standout FIGURE 30 16 depending on stud length Single Aluminum Wheel Applications TABLE 3 Steel Wheels BATCO Cap Nut Number 3 4 16 Threaded 13 3013 R and 13 3013 L Studs Single Steel Wheel Applications TABLE 4 1 When installing the inner dual verify the inner nuts being used are suitable for the application aluminum wheels steel wheels brake drum thickness Inner cap nuts must be deep enough to ensure the stud will not bottom inside the nut and must be of a configuration approved by wheel manufacturer 2 Rotate the hub to bring a drum pilot to the to
15. oduct information or visit our web site at www conmet com Lubricant Fill Plug standard on trailer hubsoptional on drive hubs ABS Ring Optional Inner Bearing Cup Outer Bearing Cup Wheel Studs TN Trailer Hub FIGURE 5 Contact ConMet at 1 800 547 9473 or www ConMet com Literature Description 10005642 PreSet Hub Service Manual ConMet Hub Service 10008647 Manual Corresponding Literature TABLE 1 Consolidated Metco Inc IDENTIFICATION WHEEL MOUNTING SYSTEMS ConMet Hubs are available in both hub Hub Pilot Wheel Mounting The hub pilot wheel mounting system makes use of a single two piece flange nut on each wheel stud for both single and dual wheel applications see figure 6 The hub pilot wheel mounting system is also known as the Uni Mount 10 10 stud WHD 10 10 stud WHD 8 8 stud and ISO system si ngle Hub Pilot Mounting Systems FIGURE 6 Consolidated Metco Inc Ball Seat Wheel Mounting System The ball seat wheel mounting system makes use of the spherical contact area between the nut and wheel to both locate the wheel and hold the wheel tight against the brake drum see figure 7 The ball seat wheel mounting system is also known as the stud piloted ball seat cap nut BCN and double cap nut DCN system single Dual Ball Seat Mounting Systems FIGURE 7 PERIODIC INSPECTION AND PREVENTIVE MAINTENANCE ConMet requires a visual inspection of the wheel hub sy
16. p 12 o clock position see figure 31 Position the inner wheel and tire assembly over the studs against the drum Drum Filos Rotating the Wheel Pilot to 12 O Clock FIGURE 31 3 Beginning in the 12 o clock position install the inner cap nuts by hand to ensure they are not cross threaded Do not tighten any nuts at this time Consolidated Metco Inc REINSTALLATION 4 Apply sufficient torque about 50 Ft Lbs to the inner top cap nut to draw the brake drum up on the drum pilot and against the hub and seat the ball seat of the nut into the ball socket of the wheel see figure 32 Inner Cap Nut at 1 oclock position Tightening the Inner Cap Nuts FIGURE 32 5 To properly center the wheel lightly tighten the remaining wheel nuts Verify the drum is in place over the drum pilots 6 Starting with the top nut first and using a staggered pattern torque the inner wheel nuts in stages to 450 500 FteLbs see figure 33 The last nut rotation must be with a calibrated torque device Torquing the Inner Wheel Nuts FIGURE 33 Use the appropriate nuts with the above technique to install the front and outer dual wheels Follow your shop practice to locate the valve stems 7 Install the outer wheel and nuts and tighten to 450 500 Ft eLbs see figure 34 The last nut rotation must be with a calibrated torque device Consolidated Metco Inc Torquing the Outer Wheel Nuts FIGURE 34 8 Inspe
17. remove the outer bearing Removing the outer bearing may cause the seal to become misaligned resulting in premature seal failure Consolidated Metco Inc 13 REINSTALLATION Failure to fill and maintain the hub with the correct amount of OIL LUBRICANT SEMI FLUID GREASE LUBRICANT NOTE Use any oil approved for use with manually adjusted bearings refer to trailer or tractor OEM for oil recommendations opat semi fluid grease may cause premature failure of the wheel hub system bearing failure and possible loss of the wheel and will 1 Fill the hub through the hubcap or the fill hole with oil void your warranty It may be necessary to add lubricant more than once to NOJl Please refer to TMC RP 631A for the recommended fill and maintenance procedures adequately fill the hub see figure 23 1 If the hub is equipped with a fill hole remove the fill hole plug 2 Fill the hub with the OEM recommended amount of room temperature 60 F minimum semi fluid grease through the fill hole in the hub Figure 25 Filling the Hub with Oil FIGURE 23 2 Be certain the hub cap is properly filled to the oil level mark on the face of the cap Filling Hub with Semi Fluid Grease FIGURE 25 3 Reinstall and tighten the fill plug to 20 25 Ft eLbs 14 Consolidated Metco Inc REINSTALLATION BRAKE DRUMS AND WHEELS Hub Pilot Wheel Mounting System N CAUTION The brake drum must be fully seated on the drum pilo
18. stem every 12 months or 100 000 miles In addition to the annual visual inspection you should maintain current shop preventive maintenance and pre trip inspection practices VISUAL INSPECTION OIL LUBRICATED Visually inspect for leakage and oil contamination Leakage Indicators 1 Check to be certain that no oil is present around the hubcap or on the wheel N CAUTION If oil is present investigate the cause and take corrective action 2 Check to be certain that no oil is present on the hub brake hardware or brake shoes If oil is present the seal may be defective improperly installed or worn out Replace the seal by following the instructions as outlined in this manual Oil Contamination Allow any air in the oil to escape prior to inspection Visually inspect the lubricant for discoloration Under normal conditions the oil will darken slightly A white or milky appearance indicates water contamination If the inspection indicates contamination completely service the wheel hub by following the instructions as SEMI FLUID GREASE LUBRICANT Visually inspect for leakage and grease contamination Leakage Indicators 1 Remove hubcaps 2 Inspect the outer bearing to make sure sufficient grease is present and that there is no sign of contamination 3 If additional grease is required follow the OEMs recommendations for adding lubricant Grease Contamination Visually inspect the grease for discoloration
19. stud all the way into the hub Be sure the stud is fully seated and that the stud head is not embedded into the hub NAW AS NIN If the stud head is embedded into the hub the hub should be replaced ABS TONE RING As Applicable 1 Inspect the ABS Tone Ring for any damage caused during hub removal or hub servicing 2 If replacement is necessary use a small pry bar Installing the ABS Tone Ring see figure 17 or hammer to gently remove FIGURE 18 the ring using a circular pattern around the ring to prevent cocking 3 Thoroughly clean and degrease the ABS ring seat on the hub with a nonflammable solvent Consolidated Metco Inc 11 INSPECTION REPAIR AND REPLACEMENT 7 Inspect the ring to ensure proper seating If the ring is not completely seated continue to drive the ring with the ring installation tool until the ring is completely seated A dial indicator can be used once the hub is reinstalled on the spindle to check axial runout Using a Hammer to Install the Ring FIGURE 19 Consolidated Metco Inc REINSTALLATION INSTALLING THE WHEEL HUB 3 Install the axle nut system and adjust the bearings as required by the axle bearing or seal manufacturer or reference TMC RP 618 for adjustment recommendations Never support the hub on the spindle with just the inner bearing figure 22 and table 8 and seal This can damage the seal and cause premature failure i e by cocking the seal in the bore NOTE
20. t and against the hub face during and after installation of the wheel s If your shop practice requires the use of lubricant or anti corrosion material to the threads and or the drum pilot area avoid getting lubricant on the flat mating surfaces of the hub drum and wheels Always tighten the top nut first to fully seat the brake drum on the drum pilot and against the hub face See the adjacent diagram for bolt tightening sequence and tighten in order from 1 through 8 or 10 depending on the bolt pattern see figures 26 27 10 Stud Tightening Sequence FIGURE 26 8 Stud Tightening Sequence FIGURE 27 1 Remove all foreign material to ensure the drum fits the drum pilot properly and can fully seat against the hub mounting face 2 In environments where a corrosion inhibitor is beneficial ConMet recommends the use of Corrosion Block a product of Lear Chemical Research 905 564 0018 In severely corrosive environments a light coat of Corrosion Block on the drum and wheel pilots has proven beneficial Consolidated Metco Inc 3 In addition to the above preparation apply two drops of oil to a point betweeen the nuts and nut flange washer and two drops to the last two or three threads at the end of each stud Also lightly lubricate the pilots on the hub to ease wheel installation and removal Do not get lubricant on the mounting face of the drum or wheel Failure to clean lubricant from these surfaces may result in
21. tor If zero end play is measured back the adjustment off about one half flat and remeasure Use the chart to the right as a guide to identify how far to turn the nut to make the final adjustment The goal is to achieve wheel bearing end play of 001 to 0005 when measured with a dial indicator If end play is not within 001 to 005 readjustment is recommended idi Single nut ii For single axle 13 000 19 000 Ib capacity with tang washers consult manufacturer s specifications aa Positive adjustment wheel bearings a product of Rockwell International use 250 300 Ibeft on adjusting nut and jam nut See Rockwell Field Maintenance Manual No 14 Consolidated Metco Inc 19 CON ey Consolidated Metco Inc 13940 N Rivergate Blvd Portland OR 97203 Phone 800 547 9473 Fax 503 240 5488 www conmet com ConMet Part No 10008647 6 03
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