Product Support Program For Reworking The Air Conditioner Compressor Belts That May Loosen And/Or Come Off On Certain 928G Wheel Loaders And IT28G Integrated Tool Carriers Caterpillar

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 "PS4778" 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

The air conditioner compressor belts may loosen and/or come off on certain 928g wheel loaders and it28g integrated tool carriers.

Affected Product
Model & Identification Number

928G (7SR737, 7SR739-740, 7SR747-753, 7SR755-758, 7SR762, 7SR764-766, 7SR776, 7SR783, 7SR785, 7SR792, 7SR797, 7SR807-816, 7SR818-820, 7SR823, 7SR827, 7SR830, 7SR832, 7SR838-839, 7SR844-845, 7SR848, 7SR850-851, 7SR855, 7SR858-859, 7SR861-866, 7SR869-870, 7SR873)

IT28G (9AR376, 9AR378, 9AR383-385, 9AR387-390, 9AR392-400, 9AR403-406, 9AR408, 9AR411-413, 9AR415, 9AR417, 9AR421, 9AR423, 9AR426, 9AR428-430, 9AR434-435, 9AR438-440, 9AR443-446, 9AR454)

Parts Needed

1 - 3E8028 Bolt - Socket

4 - 9M1974 Washer - Hard

2 - 8T4121 Washer - Plate

1 - 8T4133 Nut

2 - 6V5196 Bolt - Socket

1 - 1530689 Bracket Assembly

Action Required

See the attached rework procedure.

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.

Attach.

(1-Rework Procedure)

Rework Procedure

1. Switch off machine at isolator switch.

2. Loosen air conditioner compressor from mounting. Keep original Vee-belt.

3. On machines equipped with sound suppression, remove suppression material from engine valve cover. Remove compressor bottom (long) mounting bolt and hardware and discard.

4. Remove the appropriate two inlet manifold hex bolts and washers and discard. Install 1530689 Bracket Assembly at the two hole mounting face using two 6V5196 Hex Socket Head Bolts and four 9M1974 Washers (two washers under each bolt head). Do not fully tighten bolts. If engine sound suppression is fitted, reinstall after making cut-outs in the insulation material to clear the bracket and mountings.

5. Install the longer 3E8028 Hex Socket Head Bolt, first through the boss mounting end of 1530689 Bracket, then through the compressor mounting lugs, and through the existing cast mounting bracket with one 8T4121 Washer and 8T4133 Nut. Do not fully tighten.

6. Tighten the two 6V5196 Bracket Mounting Bolts to 28 ± 7 N·m (21 ± 5 ft lbs).

7. Reinstall existing compressor vee belt and tension this "used" belt to 445 ± 44 N (100 ± 10 lb).

NOTE: Should it be found necessary to replace the vee belt at this time, when installing the new 1W9693 belt, tension to 712 ± 22 N (160 ± 5 lb).

8. Tighten all compressor mounting bolts and nuts to 55 ± 10 N·m (40 ± 7 ft lbs).