Usage:
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 only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS0853" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
NOTE: This Revised Service Letter replaces the September 6, 1995 (Revised November 1997) Service Letter. Changes have been made to the TERMINATION DATE and Problem.
Termination Date
May 31, 1999Problem
The 8R5721 Rear Axle Front Trunion may crack in the radius between the bolt flange area and the center support. This problem is currently being addressed. This service letter is intended to provide support until a new part is available.
Affected Product
Model & Identification Number
994 (9YF6-Up)
Parts Needed
- 1 - 8R5721 Support-Trunnion
Action Required
Refer to the procedures in the Service Manual.
Park the machine on a level hard packed surface.
Block up the rear of the machine so that the rear tires are off the ground by a couple of inches.
Remove the drive shaft going to the rear axle.
Remove the 8 bolts that hold the front trunnion to the frame.
Loosen the 16 bolts that hold the rear trunnion to the frame. Do not remove, loosen only enough to allow the axle assembly to tilt forward so the front trunnion can be removed.
Remove the 12 bolts and front trunnion retainer.
Remove the front trunnion. The approximate weight is 360 kg (792 lb).
Service Claim Allowances
NOTE: This is a 8-hour job.
NOTE: If there has been a previous repair, part age will apply. Retain a copy of the previous repair invoice in the dealer's records for audit purposes, and specify repair date and machine hours in the "Additional Comments" section of the warranty claim.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.