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Torque-Hun Final DrivesService Manual

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Fairfield Manufacturing Company, Inc.South Concord Road, Lafayette. Indiana 47902. U,S.A. 317/474-3474

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IntroductionThis Service Manual is a step-by-stepguide designed for the customer or shopmechanic who is servicing or repairing aparticular model of Torque-Hub FinalDrive. (The model covered by this copy ofthe Manual is specified on the Manualcover.)

Included are -1. assembly and exploded view drawings2. disassembly procedure'3. main assembly procedure (assuming

a" sub-assemblies to be intact)4. sub-assembly procedures.

At the time of printing, this Manual wascomplete for the specific Torque-Hubmodel designated. However, FairfieldManufacturing Co., Inc., reserves the rightfi update and improve its products at any

.--trme. All specifications and proceduresare therefore subject to change withoutnotice.

SafetyStandard safety practices should befollowed during the disassembly andassembly procedures described. Safetyglasses and safety shoes should be worn;heavy, heat resistant gloves should beused when heated components arehandled. Be especially alert when yousee a caution symbol (&). This symbolindicates that a particular operation couldcause personal injury if not performedproperly or if certain safety procedures arenot followed.

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'(\ W1A-W1BDisassembly Procedure

1. Loosen all 16 Cover Bolts and drainthe oil from the unit.

2. Remove the 16 Cover Bolts and lift offthe Cover Sub-Assembly. Discard the'0' ring Seal from the Covercounterbore.

3. Lift out the Carrier Sub-Assembly andthe top Thrust Washer. The ThrustWasher may stick inside the Cover.

(C·4. Pry the Ring Gear loose and remove it.

Discard the '0' ring Seal from the Hubcounterbore.

5. Remove the Input Shaft, Input Gear,and the Thrust Spacers that are on theInput Shaft.

6. Liti out the Internal Gear and ThrustWasher. The Thrust Washer may stickto the bottom of the Carrier.

7. Remove the Retaining Ring from theSpindle and discard; then lift the huboff the Spindle. .

8. The inside Bearing Cone and theBearing Shim can now be removed.

9. The Seal can be pried out of the Hubwith a screw driver or pry bar. Thiswill also allow the outside Bearing tobe removed.

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Note: If bearing replacement isnecessary, the Bearing Cups canbe removed with a "slidehammer puller" or driven out'With a punch.

10.To remove the Cluster Gears from theCarrier, drive the anti-roll pin into thePlanet Shaft of the Cluster Gear. Afterthe Planet Shaft is removed the roll pinshould be driven out of the Planet Shaft.

WARNING: When rebuilding the unit, the'0' rings and Retaining Rings should

always be replaced.

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.Vlain Assembly Procedure )

1. Using an arbor type press if available,press Bearing Cups with large insidediameters facing out, into Hubcounterbores. Cup #JLM50681 0 willgo into small end of HUb, and Cup#JM205110 will go into large end ofHub. If Studs are being used, they canbe pressed in at this time. Solidsupport must be used in this operation.

2. Place Bearing cone #JLM506849 intoBearing Cup in small end of HUb.

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3. Press Seal into Hub counterbore withflat metal side facing in. Use a flatobject to assure that Seal is pressedevenly and is flush with Hub face.

4. Lower Hub onto Spindle with largeopen end up.

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5. Place Bearing Cone #JM205149 overend of Spindle and into Bearing cup.

6. Place Bearing Shim over end ofSpindle and against Bearing Cone.

7. Secure Retaining Ring completely intoSpindle groove and against BearingShim. Be-sure that Retaining Ring isentirely in groove.

6Eye protection should be worn .".during Retaining Ring installation.

8. Place Internal Gear onto end ofSpindle.

9. Place Input Shaft Assembly intoSpindle bore with unsplined end facingout.

positionpunchmarksat 12 o'clock

10.Place narrow Thrust Spacer over InputShaft with counterbore side facingSpindle.

11.Place '0' Ring into Hub counterbore.Use petroleum jelly or grease to hold'0' Ring in place. Slight stretching ofthe '0' Ring may be necessary toinsure proper seating.

12.Place Carrier Assembly on a flatsurface with the large gears up andpositioned as shown. Find the punchmarked tooth on each large gear andlocate at 12 o'clock (straight-up) fromeach planet pin. Marked tooth will belocated just under the Carrier onupper two gears.

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, 3.With shoulder side of Ring Gear facingdown, place Ring Gear over (into meshwith) large gears. Be sure that punchmarks remain in correct locationduring Ring Gear installation.

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14.Turn over Carrier Assembly and RingGear while keeping gears in mesh.Place Thrust Washer into Carriercounterbore. Use petroleum jelly orgrease to hold washer in place.

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15. While holding Ring Gear. Input Gear andCluster Gears in mesh. place small side ofCluster Gears into mesh with the InternalGear. On the Ring Gear locate the holemarked "X" over one of the counterboredholes in Hub. Mark these holes onoutside diameter for later use.

Note: If gears do not mesh easily or Carrier Assembly does not rotate freely. then removethe Carrier and Ring Gear and check the Cluster Gear timing.

16. Place Thrust Washer into Carriercounterbore.

17. The Input Gear is now installed into thecarrier meshing with the large diametercluster gear. The counterbore in the boreof the Input Gear must be to the inside ofthis assembly.

19.Place '0' Ring into Cover Assemblycounterbore. Use petroleum jelly orgrease to hold '0' Ring in place.

20.Place Cover Assembly over Ring Gearwith oil level check plug in Coverlocated approximately 90° from oil fillplug in Hub.

21.Locate four Shoulder Bolts with flatwashers, 90° apart into counterboredholes in Hub marked in step 16.Torque Shoulder Bolts to 23-27 ft. Ibs.

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22.Use standard grade 8-5/16-18x2%bolts with flat washers in remainingholes. Torque to 23-27 ft. Ibs.

23.Place Coupling into Spindle and ontoInput Shaft.

This completes the Torque-HubAssembly. The unit must be filled one­half full of EP90 lubricant beforeoperation. ).

e Assembly ProcedureFor Sub-AssembliesInput Shaft Sub-Assembly

t . Place Washer, Spring and Washer, inthat order, onto Input Shaft.

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2. Install Retaining Ring into Input Shaftgroove to secure Spacers and Spring toshaft .

.&Eye protection shou Id be wornduring Retaining Ring installation.

Carrier Sub-Assembly

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1. Apply a coat of grease or petroleumjelly to Cluster Gear bore.

2. Place sixteen Needle Rollers intoCluster Gear bore.

3. Place Spacer washer into opposite sideof Cluster Gear and against NeedleRollers.

4. Place second set of sixteen NeedleRollers into Cluster Gear.

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{.5. Apply grease or petroleum jelly to the

tang side of two Thrust Washers. PlaceThrust Washers against bosses inCarrier with washer tang fitting intoslot in Carrier outside diameter.Note: Some old style Carriers will not

have slots and "tangs should belocated inside boss relief.

6. While keeping Thrust Washers inplace, slide Cluster Gear into Carrierwith the larger gear on the side withthe small pin hole.

7. Line up Cluster Gear and thrustWashers with hole in Carrier and slidePlanet Shaft through. Line upchamfered side of hole in Planet Shaftwith pin hole in Carrier.

8. Drive Anti-Roll Pin flush into Carrierhole, thereby locking Planet Shaft intoplace.

Repeat these steps for remaining twoCluster Gears to complete Carrier SubAssembly.

Cover Sub-Assembly

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1. Screw Pipe Plug into Cover.

2. Slip '0' Ring over Cover Capand against face.

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3. Place '0' Ring into Cover Cap internalgroove. The Disconnect Rod may beused to push '0' Ring into groove.

4. Place Cover Cap into Cover with largehole located over Pipe Plug. SecureCover Cap to Cover with two %-20x3Abolts. Torque bolts to 70-80 in. Ibs.

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5. Place Disconnect Cap over Cover Capwith nipple facing out. SecureDisconnect Cap to Cover with two1;4-20x3A bolts. Torque bolts 70-80in.lbs.

6. Turn Cover over and push DisconnectRod into Cover Cap. Rod will be heldin place by friction from the '0' Ring.

Cover Sut-AssemOly

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FOR MATERIAL HANDLING EQUIPMENT, FARM MACHINERY, ROAD EQUIPMENT, MINING MACHINERY, ETC.

Fairfield Manufacturing Company, Inc.South Concord Road. Lafayette, Indiana 47902, U.S.A. 317/474-3474

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