Product Support Program For Installing A New Gear And Bearing Assembly In The Transfer Gear Group Of Certain 657E Scrapers Caterpillar

NOTE: The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

NOTE: This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4652" as Part Number, "7755" as Group Number, and "96" as Description Code.

Termination Date

Problem

The bearing cups may rotate and cause wear that can result in a bearing failure of the 2S6527 Bearing Assembly in the transfer gear group of certain 657E Scrapers.

Affected Product
Model & Identification Number

657E (91Z321-426,91Z428,91Z430)

Parts Needed

1 - 6D1004 Gasket

1 - 8E8855 Gear

1 - 1H5728 Seal-o-ring

2 - 1H9696 Ring

1 - 2H3932 Seal

1 - 2H6184 Seal

1 - 8H7521 Seal-o-ring

1 - 2P9250 Shim Pack

1 - 2S0613 Ring

1 - 9W3513 Bearing As.

Action Required

Follow the procedures in the Service Manual to install the new 6P9056 Gear, 2S6527 Bearing Assembly, and associated parts. If the case needs to be reworked due to fretting, see the attached rework procedure.

Service Claim Allowances

NOTE: This is a 5-hour job.

Parts Disposition

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

Attach.

(1-Rework Procedure)

Rework Procedure

1. If the case shows sign of fretting, machine the case to clean up the fretting.

2. Fabricate a spacer that is equal to the difference between the dimension shown in Illustration 1 and the depth of the face after the cleanup operation.

Illustration 1 - Case Depth Dimensions

3. Coat the case bore with gasket maker during assembly or add a groove for an O-ring in the transfer gear case using the dimensions given in Illustration 2. If an o-ring groove is machined in the case, a 2H3931 O-ring Seal will be needed.

Illustration 2 - Case Depth Dimensions