PRODUCT SUPPORT PROGRAM FOR INSTALLING A NEW BRAKE ACCUMULATOR OR REPLACING THE OLD PISTON SEAL ASSEMBLY ON CERTAIN 797F OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT SUPPORT PROGRAM FOR INSTALLING A NEW BRAKE ACCUMULATOR OR REPLACING THE OLD PISTON SEAL ASSEMBLY ON CERTAIN 797F OFF-HIGHWAY TRUCKS

Usage:

TEBE2479-00

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13Jan2015

U-12

A-8

D-11

O-11

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Before/After	PRODUCT SUPPORT PROGRAM FOR INSTALLING A NEW BRAKE ACCUMULATOR OR REPLACING THE OLD PISTON SEAL ASSEMBLY ON CERTAIN 797F OFF-HIGHWAY TRUCKS
4263 7555		PS44626

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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 "PS44626" 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

30Sep2016

PROBLEM

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The existing accumulator piston seal can fail on certain 797F Off-Highway Trucks. If the existing part fails, the accumulator will lose charge pressure prematurely, causing the brake pump to cycle excessively.

AFFECTED PRODUCT

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Model	Identification Number
*****Group 1*****
797F	LAJ00343-00377, 379-438, 440-543
797F XQ	WSP00115-00129

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*****Group 2*****
797F	LAJ00141-00194, 197-339, 341-342
797F XQ	WSP00100-00114

PARTS NEEDED

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Qty	Part Number	Description
*****Group 1*****
4	4509200	KIT-PISTON
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 17% 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.
*****Group 2*****
4	4511068	ACCUMULATOR GP-D
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 9% 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 attached Rework Procedure.

Refer to KENR8382, Disassembly and Assembly, in order to complete this Rework Procedure.

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Image1

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%
*****Group 1*****
0-10000 hrs, 0-20 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
10001-12000 hrs, 21-24 mo	33.0%	50.0%	0.0%	0.0%	50.0%	50.0%

NOTE: This is a 30.0-hour job for Group 1

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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%
*****Group 2*****
0-10000 hrs, 0-20 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
10001-12000 hrs, 21-24 mo	33.0%	50.0%	0.0%	0.0%	50.0%	50.0%

NOTE: This is a 8.0-hour job for Group 2

PARTS DISPOSITION

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

Rework Procedure

Group Number 1

1. Disassemble the 377-4739 and 377-4740 Brake Accumulators.

2. Replace the existing piston seal assembly with a new 450-9200 Piston Kit.

3. Reassemble the 377-4739 and 377-4740 Brake Accumulators.

Group Number 2

1. Replace the 286-0796 and 286-0798 Accumulator Assembly with a new 451-1068 Accumulator Group. The new 451-1068 Accumulator Group contains the new 450-9200 Piston Kit.

Note: IF the machine has previously been upgraded to the 377-4740 Brake Accumulator Group, then the accumulator will need to be disassembled and piston/seal replaced with new 450-9200 Piston Kit, as directed in Group 1.