Procedure to Salvage Reaction Hubs, Retainers, and Seal Retainers Used in Wheel Groups of Off-Highway Trucks{4001, 4008, 4050, 4051} Caterpillar

Off-Highway Truck/Tractor: All

Introduction

© 2014 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 in order 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 in order 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 questions or additional information concerning this guideline, submit a form for feedback in the Service Information System. In order to address an urgent issue, use the following resources in order to communicate your request to Caterpillar Repair Process Engineering:

• Caterpillar Dealer Technical Communicator

• Dealer Solution Network

• Caterpillar Technical Representative

• Knowledge Network

Canceled Part Numbers and Replaced Part Numbers

This document may include canceled part numbers and replaced part numbers. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Summary

This guideline should be used with Reuse and Salvage Guideline, SEBF8083, "Inspection and Salvage of Wheel Spindles for All Off-Highway Trucks". This guideline includes information on repairing spindle hubs and retainers that was removed from SEBF8083. This guideline includes information to repair hubs and retainers using Thermal Spray. This process should be used instead of the fabricated spacer procedure recommended in previous guides.

References

Tooling and Equipment

Important Safety Information

Illustration 1	g02139237

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.

Show/hide table

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" and followed by a "Signal Word" such as "WARNING" as shown below.

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.

Show/hide table

Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

Wheel Station Type Identification

Illustrations 3, 4, and 5 show typical wheel configurations used on Caterpillar off-highway trucks.

Illustration 3	g02190714
Rear wheel group with two-piece spindle for 773 and early 773B.

Illustration 4	g02190715
Rear wheel group with one-piece spindle, typical for all other off-highway trucks.

Illustration 5	g02190716
Front wheel group, typical for all off-highway trucks.

Thermal Spray (Arc)

Arc spray is an acceptable thermal spray operation for repairing hub and retainer faces. Refer to Reuse And Salvage Guidelines, SEBF9238, "Fundamentals of Arc Spray for Reconditioning Components" to find arc spray recommendations and applications.

Note: Only Cat dealers utilizing thermal spray equipment "in house" are allowed use of the thermal spray applications.

Visual Inspection

Reaction hubs connect the spindle to the reduction ring gears through splines. Fretting can occur at the contact surface between the bearing and the hub or retainer. Spline wear can affect fretting. Hub and retainer fretting limits are:

1. 50% of the contact surface (face) width

2. 180° of the contact surface diameter

Illustration 6	g02190854
(A) Contact face width (B) 180° of contact face

Illustration 7	g02190993
(1) Laser hardening - not fretting

Illustration 8	g02190997
(2) Fretting (3) Laser hardening

Wear exceeds 180° of the contact surface diameter. Follow the salvage procedure provided in this guide and use again.

Use Again.

Illustration 9	g02191599

If the wear can be machined off with a cut no deeper than 1.02 mm (0.040 inch), follow the salvage procedure provided in this guide and use again.

Use Again.

Illustration 10	g02191601
Retainer

Use a 1U-5516 Roloc Surface Conditioning Disc or a 1U-5517 Roloc Surface Conditioning Disc to clean the surface before using again.

Use Again.

Illustration 11	g02192033
Hub

Follow the salvage procedure provided in this guide and use again.

Use Again.

Illustration 12	g02192109
Hub

Buff the surface and use again.

Use Again.

Spline wear creates clearances and can cause movement between the hub and retainer as a result of shock loads from speed, load, and/or directional changes.

Illustration 13	g02192124
(4) Spline wear step

Do Not Use Again.

Illustration 14	g02192334
Corrosion

Do Not Use Again.

Salvage Procedure

If more than 50% of the contact surface width or 180° of the contact surface diameter is worn, the hub or retainer may be salvaged using arc spray. If the splines are damaged, the part cannot be used again.

To salvage a worn hub or retainer, remove up to 1.02 mm (0.040 inch) of material from the contact face from the new specification. The contact face should then be sprayed and machined back to specification. Refer to Special Instruction, SERF8473, "Arc Spray Guide" for the appropriate arc spray specifications. Use the tables in this guideline to determine if the hub or retainer can be salvaged using arc spray.

Rear Wheel Components

Hub

Measure width (F). If wear is less than 1.02 mm (0.040 inch) deep, you may grind the surface face to 1.02 mm (0.040 inch) less than the original dimension. Arc spray the face and grind the hub to the specified dimension with a 3.5 µm (138 µ inch) surface finish.

Illustration 15	g02192613
Reaction hub dimensions for spindles. (F) Hub thickness (G) Surface finish 3.5 µm (138 µ inch) (5) Opposite face

Hub Retainer

Measure width (R). If wear is less than 1.02 mm (0.040 inch) deep, you may grind the surface face to 1.02 mm (0.040 inch) less than the original dimension. Arc spray the face and grind to the specified dimension with a 3.5 µm (138 µ inch) surface finish.

Illustration 16	g02202541
(R) Retainer thickness (6) Contact face

Illustration 17	g02202542
(R) Retainer thickness (6) Contact face (7) Opposite face

Illustration 18	g02202548
(R) Retainer thickness (6) Contact face

Front Wheel Components

Bearing Retainer

Measure width (R). If wear is less than 1.02 mm (0.040 inch) deep, you may grind the surface face to 1.02 mm (0.040 inch) less than the original dimension. Arc spray the face and grind the retainer to the specified dimension with a 3.5 µm (138 µ inch) surface finish.

Illustration 19	g02203394
(R) Retainer thickness (6) Contact face

Illustration 20	g02203395
(R) Retainer thickness (6) Contact face