Product Support Program For Replacing The Compressor Mounting Bracket On Certain 3126 Freightliner Truck Engines 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 "PS4261" 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.

Termination Date

Problem

Freightliner trucks with 3126 Engines and the 1236357 (Midland-Gram) Compressor Group may crack the front cover due to loosening of the compressor rear mount. A thickened spacer (lengthened bolt) at the mount has been added to correct the problem.

Affected Product
Model & Identification Number

3126 (1WM1-6303)

Freightliner Arrangements

1344828 1268644 1319250

1268645 1268646 1324814

1268647 1268648 1341610

1268649 1268650 1344825

1268651 1268652 1344827

1268653 1268654 1344864

1268660 1276531 1344865

1276570 1276571 1350961

1285751 1285788 1354873

1285789 1299794 1354874

1360656 1371529 1375324

1385986 1414220 1431061

1431111 1445866 1445867

1452072 1468749 1506079

1541025 1553267 1420618

1420619 1420620 1476095

1476019 1476020 1475976

1476021 1499044

Parts Needed

1 - 4D9517 Clip

1 - 3E4353 Washer

1 - 0S1590 Bolt

1 - 2V5956 Hose Assembly (if needed)

1 - 1013121 Spacer

Action Required

See the attached rework procedure.

Service Claim Allowances

Parts Disposition

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

Attach.

(1-Rework Procedure)

Rework Procedure

1. Spot clean the compressor.

2. Install improved parts.

3. Tighten the 0S1590 Bolt to a torque of 50 ±10 N·m (37 ± 7.4 lb ft).

4. Test Engine.

Illustration 1