HARNESS AS-WIRING 1591194 - Caterpillar

November 9, 2005
U-356
A-264
D-281
O-294
After failure only
PRODUCT SUPPORT PROGRAM FOR REPLACINGFAILED DIFFERENTIAL THRUST WASHERS ON CERTAIN 793, 793B, AND 793C OFF-HIGHWAYTRUCKS
3258 PS51049
This Program can only be administeredafter a failure occurs. The decision whether to apply the Program is madeby the dealer. When reporting the repair, use "PS51049" as the Part numberand "7755" as the Group Number. Use "96" as the Warranty Claim DescriptionCode and use "Z" as the SIMS Description Code. The information supplied in this serviceletter may not be valid after the termination date of this program. Donot perform the work outlined in this Service Letter after the terminationdate without first contacting your Caterpillar product analyst.TERMINATION DATE
November 30, 2007PROBLEM
In some applications the 8C7562 Screw that retainsthe 1546619/">154-6619 Thrust Washer in place in the two differential halves arefailing on certain 793, 793B, and 793C Off-Highway Trucks. The head ofthe screw has been breaking at the top thread causing damage to both the1546619/">154-6619 Thrust Washer and the 6W8259 Bevel Gear. The problem can be identifiedby high levels of copper & iron in the differential oil samples.AFFECTED PRODUCT
Model Identification Number
793 3SJ00001-Up
793B 1HL00001-Up
793C 4AR00001-Up
793C 4GZ00001-Up
793C ATY00001-Up
793C CBR00093-UpPARTS NEEDED
Quantity Part Number Description
4* 8C7562 SCREW-FLAT HEAD
1* 6W8259 GEAR-DIFF BEVEL
1* 1546619 WASHER
* Per half - use asrequired to replace failed and/or damaged parts.ACTION REQUIRED
Refer to the Service Manual and Parts Book asnecessary and replace the failed 8C7562 Screws, damaged 1546619/">154-6619 ThrustWashers, and damaged 6W8259 Gears Assemblies as needed with like partsuntil a final solution is available.SERVICE CLAIM ALLOWANCES
Product smu/age whichevercomes first Caterpillar Dealer Suggested Customer Suggested
Parts Labor Hrs Parts Labor Hrs Parts Labor Hrs
0-10,000 Hours0-Up Months 100% 44 0 0 0 0
10,001-15000 Hours0-Up Months 33.3 % 22 0 0 50 % 22
This is a 44-hour job.
If there has been a previous repairpart age will apply. Retain a copy of the previous repair invoice in thedealer's records for audit purposes, and specify repair date and machinehours in the "Additional Comments" section of the warranty claim.PARTS DISPOSITION
Handle the parts in accordance with your WarrantyBulletin on warranty parts handling.