HOUSING AS-TURBINE 9Y7757 - Caterpillar

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.
TERMINATION DATE
30Apr2009
PROBLEM
The bearings in the transmission of certain 793C Off-Highway Trucks may
not have the correct surface finish. The service life of the adjacent thrust
washers, contacting the bearing with suspect date codes and an incorrect surface finish, may not be as long as expected. This program is to be implemented before a major failure yet after the SOS and particles in the oil indicate that a failure of
the thrust washer is going to happen. See the Action Required.
AFFECTED PRODUCT
Model Identification Number
793C ATY00975-01124
PARTS NEEDED
Qty
Part Number Description
10 8E8163 DISC-THRUST
10 8E8164 DISC-THRUST
10 1480329 BEARING
10 1480330 BEARING
ACTION REQUIRED
Monitor SOS on the transmission compartment - any indications of Copper exceeding 40 ppm AND lead 4 ppm or higher should be noted. If that condition exists inspect transmission screens. If there are any signs of bronze material in the screens, remove the transmission. If there are no signs of bronze in the screens, change the oil and filters, then resample oil for SOS at 250 hours and 500 hours. If excessive copper AND lead wear metals are present in the oil, remove the transmission, disassemble and replace the parts listed.
Replace with same part number bearings that do NOT have date code (two digit alphabetic code on 1 bar of the cage) of KI, MI or LI for both the 148-0329 and 148-0330.
Demonstration of proper approved transmission oil and completed oil service intervals are required for application of service letter. Return bearings and thrust washers along with a copy of the SOS data - Note that the service letter will not be applicable without returned parts, SOS data and required maintenance documentation.
Image1
SERVICE CLAIM ALLOWANCES
Product smu/age whichever comes first Caterpillar Dealer Suggested Customer Suggested
Parts % Labor Hrs% Parts % Labor Hrs% Parts % Labor Hrs%
0-15000 hrs 100.0% 100.0% 0.0% 0.0% 0.0% 0.0%
This is a 40.0-hour job
PARTS DISPOSITION
Return all bearings and thrust washers along with SOS data and required maintenance documentation.
Caterpillar Inc.
100 Tractor Drive - Building KK
Doc 57 Location Y58
East Peoria, IL 61630
Attn: Rodney Harms