PRODUCT SUPPORT PROGRAM FOR REPLACING THE EXHAUST ROCKER ARM ON CERTAIN 773G OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING THE EXHAUST ROCKER ARM ON CERTAIN 773G OFF-HIGHWAY TRUCKS [UEBE1402]

BASIC ENGINE

CAMSHAFT GP

PRODUCT SUPPORT PROGRAM FOR REPLACING THE EXHAUST ROCKER ARM ON CERTAIN 773G OFF-HIGHWAY TRUCKS

UEBE1402-00

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30Oct2020

X260

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Containment - Before/After (Limited distribution)	PRODUCT SUPPORT PROGRAM FOR REPLACING THE EXHAUST ROCKER ARM ON CERTAIN 773G OFF-HIGHWAY TRUCKS
1102 1123 1210		PS91135

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NOTE:

AVSpare’s obligations under this Service Letter are subject to, and shall not apply in contravention of, the laws, rules, regulations, directives, ordinances, orders, or statutes of the United States, or of any other applicable jurisdiction, without recourse or liability with respect to AVSpare.

NOTE:

This Containment Program can be administered either before or after a failure occurs. In either case the decision whether to apply the Program is made by the dealer and service rep. Obtain the service reps Goodwill Approver Code before completing the repair. EAME dealers should use their standard Industry Group specific goodwill approval codes. The Goodwill Approver Code must be included when submitting the claim.

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NOTE:	When reporting the repair, use "PS91135" 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.
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 AVSpare product analyst.

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TERMINATION DATE

31Oct2021

PROBLEM

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The existing number 12 exhaust lobe and or rocker roller can spall on certain 773G Off-Highway Trucks. If the existing rocker arm or camshaft spalls at number 12 position it can affect engine performance.

AFFECTED PRODUCT

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Model	Identification Number
773G	MWH00379-00380, 389, 391

PARTS NEEDED

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Qty	Part Number	Description
2	1R0716	FILTER-LUBE (After Failure Only)
2	5E8771	SEAL-O-RING (After Failure Only)
2	5P8429	SEAL-O-RING (After Failure Only)
6	8S9191	BOLT (After Failure Only)
1	20R1895	CAMSHAFT (After Failure Only)
1	20R8517	ARM GP-V ROCKER
6	0315085	BOLT-LOCKING (After Failure Only)
1	1090076	SEAL-O-RING (After Failure Only)
2	1178801	SEAL-O-RING (After Failure Only)
1	2314708	SEAL-O-RING (After Failure Only)
12	3565212	BOLT-12 POINT HD
1	OIL	Engine Oil See OMM (After Failure Only)
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 32% of dealership population. This is an initial order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.

ACTION REQUIRED

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Reference Disassembly and Assembly Manual RENR9217 "C27 and C32 Engines for AVSpare Built Machines", and Testing and Adjusting Manual KENR9886 "C27 and C32 Engines for AVSpare Built Machines".

Nominal wear is to be expected on valve train components during the course of 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 due to the number 12 exhaust rocker arm / camshaft lobe wear is progressing towards a low power complaint or mechanical failure.

In all cases prior to failure, valve lash must be performed per OMM guidelines and a robust SOS program must be followed.

Before Failure:

Note: Only four 3565212 Bolts are required for one rocker shaft.

Step 1: Gain access to right hand side Valve Mechanism Covers.

Step 2: Remove right hand side valve mechanism covers for cylinders 10 and 12. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".

Step 3: Remove right hand side rocker arm assembly at cylinders 10 and 12. Refer to Disassembly and Assembly, "Rocker Arm and Shaft - Remove".

Step 4: Remove the number 12 exhaust valve rocker from assembly. Refer to Disassembly and Assembly, "Rocker Arm - Disassemble" and "Rocker Arm - Assemble".

Step 5: Install Rocker Arm Assembly. Refer to Disassembly and Assembly, "Rocker Arm and Shaft - Install".

Step 6: Adjust the valve lash for the inlet valves and the exhaust valves. Refer to Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust".

Step 7: Install the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".

After Failure:
Before submission of an After Failure claim to this service letter, please attach records of valve lash and SOS history.

Access to following tooling is required to remove camshaft:
177-8001 Pilot Sleeve
249-2936 Adapter
274-7932 Guide (Front Removal)
274-7933 Guide (Rear Removal)

Step 1: Gain access to right hand side Camshaft Covers and Valve Mechanism Covers.

Step 2: Remove right hand side valve mechanism covers. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".

Step 3: Remove right hand side rocker arm and shafts. Refer to Disassembly and Assembly, "Rocker Arm and Shaft - Remove".

Step 4: Remove right hand side camshaft. Refer to Disassembly and Assembly, "Camshaft - Remove".

Step 5: Install new camshaft. Refer to Disassembly and Assembly, "Camshaft - Install".

Step 6: Replace rocker arm on rocker shaft. Refer to Disassembly and Assembly, "Rocker Arm - Disassemble" and "Rocker Arm - Assemble".

Step 7: Install rocker arm and shaft. Refer to Disassembly and Assembly, "Rocker Arm and Shaft - Install".

Step 8: Install valve mechanism covers. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".

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SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	AVSpare		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
0-12000 hrs, 0-65 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%