PRODUCT SUPPORT PROGRAM FOR REPLACING THE VIBRATION DAMPER ON CERTAIN 797, 797B, AND 797F OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING THE VIBRATION DAMPER ON CERTAIN 797, 797B, AND 797F OFF-HIGHWAY TRUCKS

Usage:

TEBE4664-01

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29Nov2017

(Revised 24May2019)

U-674

A-476

D-568

O-561

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After Failure Only	PRODUCT SUPPORT PROGRAM FOR REPLACING THE VIBRATION DAMPER ON CERTAIN 797, 797B, AND 797F OFF-HIGHWAY TRUCKS
1205 7150		PS53641

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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 can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS53641" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "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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NOTE:	This Revised Service Letter replaces the 29Nov2017 Service Letter. Changes have been made to the Affected Product.

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TERMINATION DATE

30Nov2019

PROBLEM

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The existing engine vibration damper can develop an oil leak on certain 797, 797B, and 797F Off-Highway Trucks. If the existing vibration damper develops a substantial leak it will require replacement.

AFFECTED PRODUCT

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Model	Identification Number
797	5YW00260
797B	JSM00151-00152, 220-225, 236-237, 244, 252, 256, 293
797F	LAJ00141-00648, 653
797F XQ	WSP00100-00129

PARTS NEEDED

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Qty	Part Number	Description
4	1P7115	MOUNT AS
8	2S6160	WASHER-HARD
4	2Y5829	NUT-HEX
8	3E4353	WASHER-HARD
12	5P6604	WASHER-HARD
1	6V3668	BOLT
4	6V4249	BOLT-HEX HEAD
2	6V5842	BOLT-HEX HEAD
2	6V9028	SEAL-O-RING
1	8J8919	COVER
6	8T4121	WASHER-HARD
6	8T4136	BOLT-HEX HEAD
1	8T4223	WASHER-HARD
1	20R7894	DAMPER GP-BASIC
1	1463173	DOWEL
2	1984766	WASHER-HARD
2	2416157	PLUG-HD STOR
1	2865311	DOWEL
12	3283377	BOLT-12 POINT HD
1	4612437	ADAPTER
1	4813103	GUARD AS-DAMPER
1	4852235	BRACKET
1	4852236	BRACKET
1	4852237	BRACKET
1	4852238	BRACKET
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 3% 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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Replace the spring vibration damper with a viscous fluid vibration damper per the attached Rework Procedure.

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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%
0-10000 hrs, 0-20 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
10001-16000 hrs, 21-60 mo	33.0%	50.0%	0.0%	0.0%	50.0%	50.0%

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NOTE: This is a 6.0-hour job If there has been a previous repair, part age/hours will apply. Retain a copy of the previous repair invoice in the dealer's records for audit purposes, and specify repair date and machine hours in the "Additional Comments" section of the warranty claim.

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PARTS DISPOSITION

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

Rework Procedure

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1.) Remove current spring damper from the front of the engine and clean the affected area where the leak occurred.

2.) Place 2 x 326-9881 Plugs into the crankshaft in order plug to oil feed and return holes.

Image1.1.1

3.) Use 2 x M24 Dowel Rods to mount the 461-2437 Adapter. Align the dowel and the receiving hole on the crankshaft.

Image1.2.1

4.) Mount the 476-2761 Damper by aligning the adapter dowel and the receiving hole on the damper. Note the C-Channel on the damper faces away from the engine.

Image1.3.1

5.) Lubricate the threads and underhead of the 328-3377 mounting bolts with a molysulfide base lubricant. The 5P6604 washer is used with the 328-3377 bolts.

6.) Install at least 6 of the 328-3377 bolts into open mounting holes and lightly torque to 100 Nm.

7.) Remove the dowel rods that were used for assembly.

8.) Install remaining 328-3377 bolts and torque to 100 Nm.

9.) Torque all bolts to 800 +/- 100 Nm using the sequence shown below.

Image1.4.1

10.) Subassemble Damper guard hardware to the damper guard. Tighten all hardware to 15 +/- 3 Nm.

Image1.5.1

11.) Install Damper Guard assembly onto the engine. The upper brackets bolt to the front housing. Bottom brackets bolt to the trunnion. Tighten upper brackets to 100 +/- 20 Nm for M12 bolts. Tighten lower brackets to 55 +/- 10 Nm for M10 bolts.