ELECTRONICS GP 1779164 - Caterpillar

When reporting the repair, use "PS90700" as the Part Number and "7777" as the Group Number. If administered before failure, use "56" as Warranty Claim Description and "T" as the SIMS Description Code. If administered after failure, use "96" as Warranty Claim Description Code and use "Z" as the SIMS Description Code.
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
31May2019
PROBLEM
Certain 773G Off-Highway Trucks are experiencing unusual valve train wear that includes pitting and spalling to the camshaft lobe and/or rocker roller. The failure results in poor performance leading to early hour replacement of the valve train components.
AFFECTED PRODUCT
Model Identification Number
773G MWH00247, 309-312, 319-321, 329-330, 333, 335, 370-373
PARTS NEEDED
No parts needed for this program
ACTION REQUIRED
Every 2000 hours and during a regular service interval remove the engine valve covers, inspect the camshaft and valve rocker rollers, and document the camshaft and rocker arm condition.
Refer to Operation and Maintenance Manual SEBU8547 for the valve rotators inspection procedure.
Nominal wear is to be expected on valve train components during engine life. Spalling and pitting may be present but do not necessarily indicate an eminent failure. A failure is considered when a machine is low on power or the upper valve train wear is progressing towards a low power complaint or mechanical failure.
Documentation should include clear pictures of the camshaft and rocker arms components.
SOS oil sampling should be done in-line with each oil change and closely monitored with the results kept on file with work order numbers attached.
Image 1 and Image 2 show examples of rocker arm rollers and camshafts to help identify failures.
The following Inspections will not be covered under this Program:
1.) The initial 500 Hr Inspection and Valve lash adjustment for the new engines and newly assembled trucks. But this work still needs to be performed as per the OMM.
2.) The 3000 Hr Inspection and Valve lash adjustment. But this work still needs to be performed as per the OMM.
Image1
Image2
SERVICE CLAIM ALLOWANCES
Product smu/age whichever comes first Caterpillar Dealer Suggested Customer Suggested
Parts % Labor Hrs% Parts % Labor Hrs% Parts % Labor Hrs%
0-10000 hrs,
0-60 mo 100.0% 100.0% 0.0% 0.0% 0.0% 0.0%
This is a 3.0-hour job
PARTS DISPOSITION
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.