PRODUCT SUPPORT PROGRAM FOR INSPECTING AND POSSIBLY REWORKING AND REPLACING THE FEED HOLE OF THE BRAKE HOUSING AND BRAKE PISTON SEAL ON CERTAIN D6K2 TRACK-TYPE TRACTORS Caterpillar

PRODUCT SUPPORT PROGRAM FOR INSPECTING AND POSSIBLY REWORKING AND REPLACING THE FEED HOLE OF THE BRAKE HOUSING AND BRAKE PISTON SEAL ON CERTAIN D6K2 TRACK-TYPE TRACTORS

Usage:

TEBE3917-00

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16Dec2015

A-482

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Before/After	PRODUCT SUPPORT PROGRAM FOR INSPECTING AND POSSIBLY REWORKING AND REPLACING THE FEED HOLE OF THE BRAKE HOUSING AND BRAKE PISTON SEAL ON CERTAIN D6K2 TRACK-TYPE TRACTORS
4050 4251		PS44942

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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 "PS44942" 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

31Dec2017

PROBLEM

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The feed hole of 239-4478 brake housing should be inspected and reworked according to following procedure on certain D6K2 Track-Type Tractors. The current housing condition can present burrs and rough edges damaging the 8t6378/">8T6378 Brake Piston Seal-Ring generating transmission oil leaks into the Final Drive. A Final Drive oil level increase or oil viscosity decrease, (Identified through SOS) also can be noted.

AFFECTED PRODUCT

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Model	Identification Number
D6K 2	RPR00108-00113, 115-123, 125-128, 130-131, 133, 135-142, 144-152, 154-218

PARTS NEEDED

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Qty	Part Number	Description
6	3W5159	PLATE-PARKING BK (After Failure Only)
2	3W5928	SEAL AS
4	5S3676	SEAL-O RING
2	8T6379	SEAL AS
2	1249913	SEAL-SHAFT (After Failure Only)
8	1708714	DISC-FRICTION (After Failure Only)
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 7% 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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The feed brake housing hole from both machine sides must be inspected and reworked according to the attached Rework Procedure. Refer to the Service Manual if/as necessary.

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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%
0-1500 hrs, 0-12 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

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NOTE: This is a 1.0-hour job
Note: When required, an additional 4 hours labor is allowed, per 8t6378 Brake Piston Seal-Ring that is inspected and/or replaced and feed hole reworked. Note: If after failure, when required, 1.5 hours labor per side is allowed to replace the 1708714 Discs-Friction, 3W5159 Plates-Park and 1249913 Seal-Shaft.

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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) For machines with 300 hours or more, check the Final Drive oil level and if any increases are noted, proceed to step 2. If not, no actions are required.(Before failure only).

2) For machines with less than 300 hours and/or Final Drive oil increase on both right and left hand brake system, disassemble the brake housing removing the hydrostatic motor and then the brake group.

3) Locate and inspect the 8T-6378 Seal-Ring assembled on 3W-5451 Brake Piston, (Image 1.1.1) in way to identify wear marks, (Image 1.1.2).

Image1.1.1

Image1.1.2

4) After a failure, if no marks are identified contact your service representative for further instructions. If before a failure or if marks are identified, proceed to step 5.

5) Replace the 8T-6378, (8T-6379 Seal-As) and 3W-5928 Brake Piston Seal-Rings with new.

6) On 239-4478 Brake Housing inspect the feed hole (Image 1.2.1) and perform a manual deburring on its edge in a way to remove any machining burr or sharp edge.

Image1.2.1

7) Proceed with all other damaged components replacement and system brake assembling.

Note:
Reference Disassembly and Assembly, UENR0067, "D6K2 Track-Type Tractor
Power Train" sections, "Piston Motor - Removal/Install" and "Track Brake" to perform the required actions.
Prior to re-assembly, make sure that the hydraulic oil is within contamination limit requirements.