Product Support Program For Inspection Of Drive Pumps Of Certain 953C Loaders 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 "PS8871" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

NOTE: When applicable, this program must be implemented at the same time as the September 26, 1996 Service Letter PI3927.

Termination Date

Problem

Damage to the pumps and motors on certain 953C Loaders may have began before the 1116087 and 1116088 manifolds were changed. Refer to the September 26, 1996 Service Letter PI3927. The drive pumps on these loaders need to be inspected if they operated more than 50 hours before the manifolds were changed.

Affected Product
Model & Identification Number

953C (2ZN219-423)

Parts Needed

1 - 9T5618 Pump Group

1 - 9T5619 Pump Group

Action Required

If the 1116087 and 1116088 Manifolds have not be changed, implement this program at the same time as the September 26, 1996 Service Letter PI3927.

Pumps Wear Verification Procedure

1. Remove cab floor plate. (No need to remove cab.)

2. Remove pump top cover (actuator grp 127-7040). Some hoses and tubes will need to be removed to reach the cover. The clearance between the base of the slipper (piston 115-1452) and the face of the swashplate (115-1454) must be less than .0016". If the clearance is less than .0016, no further action is required.

3. If the clearance (wear) exceeds .0016", or if other obvious damage is present, the pump needs to be replaced. In this case, the drive motors must be inspected for excessive premature wear, damage or scratches on barrel (129-4727) and port plate (of head grp 128-6174). If damaged, resurface or replace barrel and head grp.

Service Claim Allowances

Parts Disposition

U.S. and Canadian Dealers

Return all pumps that are removed from the Affected Product and a copy of the claim to:

All Other Dealers

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