SOCKET-1 3/4" 9U6564 - Caterpillar

Caterpillar: Confidential Yellow
PSP FOR PREVENTING REAR WHEEL BEARING CONES FROM ROTATING ON THE AXLE HOUSING OF CERTAIN 785 AND 789 TRUCKS - PS4637 - MAI LED US AND CANADA, COFA, BRAZIL, CFEL, COSA, LIMITED CACO
  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.
June 17, 1991 U-122 A-87.1 AU-74 B-21 E-79 O-91 PRODUCT SUPPORT PROGRAM FOR PREVENTING REAR WHEEL BEARING CONES FROM ROTATING ON THE AXLE HOUSING OF CERTAIN 785 AND 789 TRUCKS 4208, 4234, 4205 PS4637 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 "PS4637" as Part Number, "7755" as Group Number, and "96" as Description Code. Termination Date
June 30, 1992
Problem
The rear wheel bearing cones may rotate and cause wear to the housing and final drive hub on certain 785 and 789 Trucks. Wear in these areas can result in the need for more frequent wheel bearing adjustments.
Affected Product
Model Identification Number 785 8GB1-567 789 9ZC1-584
Parts Needed
2 - 8E5127 Cone-Bearing (785 Only) or 2 - 6V6565 Cone-Bearing (785 Only) 2 - 6V6567 Cone-Bearing (785 Only) 2 - 6V7709 Cone-Bearing (789 Only) 2