The Swing Cylinder Trunnion Cap Assembly Needs To Be Replaced On Certain 428B And 438B Backhoe Loaders Caterpillar

The Swing Cylinder Trunnion Cap Assembly Needs To Be Replaced On Certain 428B And 438B Backhoe Loaders

Usage:

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Caterpillar: Confidential Yellow

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 must be administered as soon as possible. When reporting the repair, use "PI3631" as the Part Number, "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T " as the SIMS Description Code. Exception: If the repair is done after failure, use "PI3631" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and " Z" as the SIMS Description Code.

Completion Date

January 31, 1994

Termination Date

July 31, 1994

Problem

The the swing cylinder trunnion cap assembly needs to be replaced on certain 428B and 438B Backhoe Loaders.

Affected Product
Model & Identification Number

428B (7EJ534-544, 7EJ547-557, 7EJ560-564, 7EJ566-570, 7EJ572-580, 7EJ582, 7EJ584, 7EJ590-607, 7EJ610, 7EJ615, 7EJ618-620, 7EJ624, 7EJ630, 7EJ634-636, 7EJ638, 7EJ645)

438B (3KK497-498, 3KK500-502, 3KK512, 3KK515-516)

Parts Needed

Dealers will need to order parts for this Program.

2 - 9T2883 Bearing

1 - 1065645 Trunnion Cap Assembly

Action Required

See the attached procedure.

Owner Notification

An example of an Owner Notification Letter is attached.

Service Claim Allowances

NOTE: This is a 1-hour job.

Parts Disposition

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

NOTE: MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.

Attach.

(1-Owner Notification Example)

(2-Rework Procedure)

Example Of An Owner Notification Letter

Rework Procedure

1. Place a lever below the barrel of the swing cylinder and lift to check for movement in the bearings. If there no movement can be detected, the swing cylinders are probably misaligned.

2. Remove the pin from the swing cylinder rod end and try to rotate the swing cylinder by hand. If the swing cylinder is difficult to rotate, the existing 9R7701 Trunnion Cap needs to be replaced.

4. Remove the existing 9R7701 Trunnion Cap Assembly by removing its six mounting bolts.

5. If the machine has been in service, replace the 2 - 9T2883 Bearings in the upper swing cylinder trunnion.

6. Install a new 1065645 Trunnion Cap Assembly using the six bolts removed in Step 4. Tighten the six bolts to a torque of 900 Nm ± 100 Nm (666 ± 74 lb ft).

7. Check the movement of the swing cylinder, as described in Steps 1 and 2, to ensure that the swing cylinder rotates freely.

8. Stamp a new part number of 1065642 into the right-hand corner of the slide frame.