Salvage and Reuse of Final Drive Axle Bearings Used in Off-Highway Trucks/ Tractors and 990 to 994 Wheel Loaders {4050, 4051} Caterpillar

Motor Grader

24H (S/N: 7KK1-UP)

24M (S/N: B931-UP; B9K1-UP)

Off-Highway Truck/Tractor

69D (S/N: 9SS1-UP; 9XS1-UP)

73D (S/N: 9YS1-UP; 1GW1-UP)

768B (S/N: 79S1-UP)

768C (S/N: 02X1-UP)

769C (S/N: 01X1-UP)

769D (S/N: BBB1-UP; 5TR1-UP; 5SS1-UP)

770 (S/N: JND1-UP; M7W1-UP; BZZ1-UP)

770G (S/N: KD21-UP; RMA1-UP; TWA1-UP; RMD1-UP; KDH1-UP; ECM1-UP; ECX1-UP)

772 (S/N: RLB1-UP; RGK1-UP; J2M1-UP; 10S1-UP; 11S1-UP; 80S1-UP)

772B (S/N: 64W1-UP)

772G (S/N: KE31-UP; TWB1-UP; RME1-UP; RMH1-UP; LTS1-UP; KEX1-UP; LTX1-UP)

773 (S/N: 63G1-UP)

773B (S/N: 5SC1-UP; 63W1-UP)

773D (S/N: NBJ1-UP; BGL1-UP; 7ER1-UP; 7CS1-UP; 7FZ1-UP)

773E (S/N: BDA1-UP; PRB1-UP; KEG1-UP; ASK1-UP; DJS1-UP)

773F (S/N: EED1-UP; EXD1-UP)

773GC (S/N: RJZ1-UP)

776 (S/N: 14H1-UP; 14W1-UP)

776B (S/N: 6JC1-UP)

776C (S/N: 2TK1-UP)

776D (S/N: 5ER1-UP; AFS1-UP)

777 (S/N: 84A1-UP)

777B (S/N: 4YC1-UP; 3NF1-UP)

777C (S/N: 4XJ1-UP)

777D (S/N: AGC1-UP; FKR1-UP; 3PR1-UP; 2YW1-UP; AGY1-UP; 6XZ1-UP)

777E (S/N: KDP1-UP; KDZ1-UP)

777F (S/N: WTK1-UP; JRP1-UP; JXP1-UP)

777G (S/N: GT71-UP; T5A1-UP; TNM1-UP; RDR1-UP; T4Y1-UP)

784B (S/N: 5RK1-UP)

784C (S/N: 2PZ1-UP)

785 (S/N: 8GB1-UP)

785B (S/N: 6HK1-UP)

785C (S/N: AP21-UP; 1HW1-UP; APX1-UP; 5AZ1-UP)

785D (S/N: DMC1-UP; MSY1-UP)

785G (S/N: SH21-UP; RTL1-UP)

786 (S/N: 81A1-UP)

789 (S/N: 9ZC1-UP)

789B (S/N: 7EK1-UP)

789C (S/N: 2BW1-UP)

789D (S/N: SP21-UP; SPD1-UP; SHH1-UP; TWP1-UP)

789G (S/N: TR21-UP)

793 (S/N: 3SJ1-UP)

793B (S/N: 1HL1-UP)

793C (S/N: CBR1-UP; ATY1-UP; 4GZ1-UP)

793D (S/N: FDB1-UP)

793F (S/N: SND1-UP; SSP1-UP; SXP1-UP; D3T1-UP; RBT1-UP)

795F AC (S/N: ERM1-UP)

797 (S/N: 5YW1-UP)

797B (S/N: JSM1-UP)

797F (S/N: LAJ1-UP; WSP1-UP; LTZ1-UP)

OEM POWERTRAIN (S/N: DTE1-UP)

Quarry Truck

771C (S/N: 3BJ1-UP)

771D (S/N: BCA1-UP; 6JR1-UP; 6YS1-UP)

773G (S/N: G731-UP; G771-UP; MWH1-UP; JWS1-UP; T5S1-UP; T5T1-UP)

775B (S/N: 7XJ1-UP)

775D (S/N: 6KR1-UP; 8AS1-UP)

775E (S/N: BEC1-UP)

775F (S/N: EYG1-UP; DLS1-UP)

775G (S/N: T5F1-UP; RFM1-UP; MJS1-UP; T5W1-UP)

Rotary Drill

MD6310 (S/N: DLK1-UP; DLZ1-UP)

Soil Compactor

835 (S/N: 44N1-UP)

Track-Type Tractor

D6H (S/N: 8KB1-UP; 7ZK1-UP)

D6H Series II (S/N: 1KD1-UP; 2KD1-UP; 4YF1-UP; 2TG1-UP; 4GG1-UP; 8ZJ1-UP; 9KJ1-UP; 5KK1-UP; 6CK1-UP; 8KK1-UP; 8SK1-UP; 9LK1-UP; 9RK1-UP; 1YL1-UP; 2BL1-UP; 2TL1-UP)

Transmission

TH55 - KRESS (S/N: KCH1-UP)

Wheel Dozer

834 (S/N: 43E1-UP)

844 (S/N: BBN1-UP; 2KZ1-UP)

844H (S/N: BTW1-UP)

844K (S/N: MBE1-UP; M4R1-UP; KLS1-UP; K4Y1-UP)

854G (S/N: AMP1-UP; A4W1-UP; 1JW1-UP)

854K (S/N: 2211-UP; KK31-UP; RM31-UP; KK61-UP; RM61-UP; H9K1-UP; H8M1-UP)

Wheel Loader

990 (S/N: 7HK1-UP)

990 Series II (S/N: BCR1-UP; 4FR1-UP)

990H (S/N: BWX1-UP)

990K (S/N: DJK1-UP; A9P1-UP; M9P1-UP; K9X1-UP)

991K (S/N: 5301-UP)

992C (S/N: 42X1-UP; 49Z1-UP)

992D (S/N: 7MJ1-UP)

992G (S/N: 7HR1-UP; AZX1-UP; ADZ1-UP)

992K (S/N: 8801-UP; KK21-UP; RM21-UP; KK41-UP; RM51-UP; H4C1-UP; ZMX1-UP)

993K (S/N: LWA1-UP; Z4D1-UP; Z8D1-UP; Z9K1-UP; Z4Z1-UP; Z8Z1-UP)

994 (S/N: 9YF1-UP)

994D (S/N: 3TZ1-UP)

994F (S/N: 4421-UP)

994G (S/N: BEH1-UP; 8FR1-UP)

994H (S/N: DWC1-UP)

994K (S/N: MM91-UP; MRK1-UP; SMX1-UP)

Wheel Tractor-Scraper

630A (S/N: 52F1-UP)

631A (S/N: 51F1-UP)

631B (S/N: 13G1-UP)

631C (S/N: 67M1-UP)

631D (S/N: 24W1-UP)

633 (S/N: 44J1-UP)

633C (S/N: 66M1-UP)

637 (S/N: 64M1-UP; 65M1-UP; 91N1-UP; 92N1-UP; 79P1-UP)

641 (S/N: 64F1-UP; 41M1-UP)

641B (S/N: 65K1-UP)

650 (S/N: 63F1-UP)

651 (S/N: 33G1-UP; 44M1-UP)

651B (S/N: 67K1-UP)

657 (S/N: 31G1-UP; 46M1-UP)

657B (S/N: 47M1-UP)

660 (S/N: 90F1-UP)

666 (S/N: 32G1-UP; 64H1-UP)

666B (S/N: 66K1-UP)

Introduction

© 2018 Caterpillar All Rights Reserved. This guideline is for the use of Cat dealers only. Unauthorized use of this document or the proprietary processes therein without permission may be violation of intellectual property law.

Information contained in this document is considered Caterpillar: Confidential Yellow.

This Reuse and Salvage Guideline contains the necessary information to allow a dealer to establish a parts reusability program. Reuse and salvage information enables Caterpillar dealers and customers to benefit from cost reductions. Every effort has been made to provide the most current information that is known to Caterpillar. Continuing improvement and advancement of product design might have caused changes to your product which are not included in this publication. This Reuse and Salvage Guideline must be used with the latest technical information that is available from Caterpillar.

For technical questions when using this document, work with your Dealer Technical Communicator (TC).

To report suspected errors, inaccuracies, or suggestions regarding the document, submit a form for feedback in the Service Information System (SIS Web) interface.

Canceled Part Numbers and Replaced Part Numbers

This document may include canceled part numbers and replaced part numbers. Use the Numerical Part Record (NPR) on the Service Information System Website (SIS Web) for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Note: This document can be used for reuse and salvage procedures of the bearing for Off-Highway Trucks and Large Wheel loaders.

Important Safety Information

Illustration 1	g02139237

Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly. Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. If a tool, a procedure, a work method, or operating technique that is not recommended by Caterpillar is used, ensure that it is safe for you and for other people to use. Ensure that the product will not be damaged or the product will not be made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.

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Improper operation, lubrication, maintenance or repair of this product can be dangerous and could result in injury or death. Do not operate or perform any lubrication, maintenance or repair on this product, until you have read and understood the operation, lubrication, maintenance and repair information.

Safety precautions and warnings are provided in this manual and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons.

The hazards are identified by the “Safety Alert Symbol” which is followed by a “Signal Word” such as “DANGER”, “WARNING” or “CAUTION”. Refer to Illustration 2 for an example of a “WARNING” Safety Alert Symbol.

Illustration 2	g00008666

This safety alert symbol means:

Pay Attention!

Become Alert!

Your safety is Involved.

The message that appears under the safety alert symbol explains the hazard.

Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication.

Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The safety information in this document and the safety information on the machine are not all inclusive. Determine that the tools, procedures, work methods, and operating techniques are safe. Determine that the operation, lubrication, maintenance, and repair procedures will not damage the machine. Also, determine that the operation, lubrication, maintenance, and repair procedures will not make the machine unsafe.

The information, the specifications, and the illustrations that exist in this guideline are based on information which was available at the time of publication. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete, most current information before you start any job. Caterpillar dealers can supply the most current information.

Summary

This guideline provides the procedures necessary to determine the reusability of the bearing. Life will vary depending on application, load, lubrication, and environment.

This guideline contains the latest standards of engineering, which will help minimize owning and operating costs. A part is expected to reach the next Planned Component Rebuild (PCR) if the part meets the specifications within this guideline and the part is intended for a similar application. Use this guideline to determine whether a part should be reused. Do not install a part that is not reusable. During reconditioning, correct any condition that might have caused the original failure.

The dimensions and tolerances provided are to return a part / component to specification. The dimensional information alone is not solely used to condemn a part from reuse. Follow the "Visual Inspection" section for further guidance.

Equipment Needed

The list of machines and tooling is a recommended list. The salvage procedure can also be completed using equivalent machinery.

Cleaning Recommendations

• Before a part is inspected, clean it thoroughly to remove all debris, paint, and oil.

• When lifting or moving parts to be cleaned, use proper lifting devices to provide for operator safety, and to prevent part damage.

• During cleaning, do not damage machined surfaces.

• Use pressurized air to dry parts.

• If inspection is not done immediately after cleaning, put hydraulic oil on all machined surfaces to prevent rust or corrosion. Carefully store the parts in a clean container.

Axle Bearing Reusability

General Reusability Guidelines

Axle bearing reusability inspections shall include a review of the following areas:

• Contact surfaces should not have deep wear grooves, deep wear steps, or adhesive smearing.

• Debris damage on thrust faces should cover less than 10% of the face.

• Contact surfaces should not have embedded debris.

• Bearings may be discolored from heat. DO NOT USE THIS PART AGAIN if the bearing ran excessively hot (black with oxidized oil stains on the surfaces).

Visual Inspection

Illustration 3	g02326894
Axle Bearing with normal wear.

OK TO USE THIS PART AGAIN

Illustration 4	g02326913
Axle Bearing with normal wear. Debris damage is less than 10% of the thrust surface.

OK TO USE THIS PART AGAIN

Illustration 5	g02326914
Bearing is discolored from high temperatures and debris in the oil (note gouge in ID bore).

OK TO USE THIS PART AGAIN if less than 10% of the face is damaged from the debris.

Illustration 6	g02326915
Debris damage and a wear step are evident.

The wear covers more than 10% of the contact surface. DO NOT USE THIS PART AGAIN, unless performing the salvage procedure.

Axle Bearing Inspection Dimensions

All bearings should be inspected prior to being salvaged. First, follow the inspection guidelines prescribed by the "Axle Bearing Reusability" section in this guideline. If the condition of the bearing is acceptable, measure dimension (A). Table 3 gives the new bearing dimensions. If dimension (A) is within 0.51 mm (0.020 inch) of the new dimension, the bearing may be safely salvaged. DO NOT USE THIS PART AGAIN, if dimension (A) is not within 0.51 mm (0.020 inch) of the new specification given in Table 3, the bearing is not salvageable.

Illustration 7	g03648818

Note: The 8X-9564 Spacer is plastic and, therefore, no salvage of this bearing is allowed.

Illustration 8	g03648816

Illustration 9	g03648819

Illustration 10	g03648820

Illustration 11	g03648821

Illustration 12	g03648822

Illustration 13	g03648825

Salvage Procedure

1. Thoroughly clean the axle bearing of all debris and discoloration with a solvent. A Surface Reconditioning Pad may be used to hand polish the part lightly.
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   Illustration 14	g02343660
   Typical Example - Bearing is installed in the lathe.

2. Locate the axle bearing in the lathe and indicate (zero) the unworn face to within 0.05 mm (0.002 inch) as shown in Illustration 14.

   Note: When locating the bearing in the chuck, care must be taken to use brass or aluminum shims between the inside bore and the chuck jaws to prevent damage to the bore.

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   Illustration 15	g02343756
   Typical Example - Machine the damaged thrust surface to remove any debris damage and denting.

3. Machine the damaged face to provide complete surface clean-up. Do not remove more than 0.25 to 0.51 mm (0.010 to 0.020 inch) of material from the new specification given in Table 3. See Illustration 15. The machined surface should be given a 1.6 microns (63 microinches) surface texture.

   Note: If the gouges are deeper than the specified limits and cover more than 10% of the face, the bearing is not salvageable.

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   Illustration 16	g02343759
   Typical Example - ID and OD that have been de-burred.

4. Use a de-burr tool to remove any burrs on the Inner Diameter (ID) and the Outer Diameter (OD).

5. Remove the axle bearing from the lathe. Clean the axle bearing in accordance with the section titled "Cleaning Recommendations" in this manual.

6. Reassemble the final drive. Refer to the appropriate Disassembly and Assembly manual.