PRODUCT SUPPORT PROGRAM FOR IMPROVING THE PARK BRAKE APPLY AND RELEASE RESPONSE ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT SUPPORT PROGRAM FOR IMPROVING THE PARK BRAKE APPLY AND RELEASE RESPONSE ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS

Usage:

TEBE5382-00

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10May2017

U-261

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Before/After	PRODUCT SUPPORT PROGRAM FOR IMPROVING THE PARK BRAKE APPLY AND RELEASE RESPONSE ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS
4264 4265 4269 4280 4258 4263 4257 4267 4251 4282		PS45479

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NOTE:

Caterpillar’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 Caterpillar.

NOTE:

This Program must be administered either before or after failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS45479" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and "T" as the SIMS Description code. If administered after failure, use "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.

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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 Caterpillar product analyst.

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TERMINATION DATE

31May2019

PROBLEM

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The existing park brake system is slow to apply when shifting into park and slow to release when shifting into gear on certain 794 AC Off-Highway Trucks. Slow Park Brake response can be an annoyance to the operator.

AFFECTED PRODUCT

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Model	Identification Number
794 AC	MN500052-00056

PARTS NEEDED

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Qty	Part Number	Description
1	6V8636	ADAPTER-STR
1	6V8790	ADAPTER-TEE
1	6V9182	ADAPTER-ELBOW
1	6V9200	ADAPTER-ELBOW
1	8T1685	ADAPTER-TEE
2	8T4121	WASHER-HARD
2	8T4137	BOLT-HEX HEAD
1	1536229	ELBOW-90 DEGREE
1	1546832	CONT GP-FOOT BK
1	1730064	ADAPTER-ELBOW
1	2147566	SEAL-O-RING-STOR
1	2147568	SEAL-O-RING-STOR
2	2287089	SEAL-O-RING-ORFS
3	2287091	SEAL-O-RING-ORFS
3	2287092	SEAL-O-RING-ORFS
4	2385084	SEAL-O-RING-STOR
1	3950807	HOSE AS
1	4544464	HOSE AS
1	4687497	HOSE AS
1	5208170	HOSE AS
1	5208171	HOSE AS
1	5210918	HOSE AS
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 8% 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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Refer to the Service Manual if/as necessary. See Special Instructions M0078552 and Service Magazine M0078554 to add a brake control relay valve inside the hydraulic enclosure to improve the park brake apply and release response.

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SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
0-30000 hrs, 0-48 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%