PRODUCT SUPPORT PROGRAM FOR INSPECTION, AND POSSIBLE REPLACEMENT, OF THE HYDRAULIC BRAKE COOLING SUPPLY TUBES ON CERTAIN 793D AND 793F OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT SUPPORT PROGRAM FOR INSPECTION, AND POSSIBLE REPLACEMENT, OF THE HYDRAULIC BRAKE COOLING SUPPLY TUBES ON CERTAIN 793D AND 793F OFF-HIGHWAY TRUCKS

Usage:

TEBE0470-02

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16Oct2013

(Revised 08Jul2014)

U-507

A-351

D-421

O-424

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*Before/After*	PRODUCT SUPPORT PROGRAM FOR INSPECTION, AND POSSIBLE REPLACEMENT, OF THE HYDRAULIC BRAKE COOLING SUPPLY TUBES ON CERTAIN 793D AND 793F OFF-HIGHWAY TRUCKS
5056		PS44055

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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 "PS44055" 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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NOTE:	This Revised Service Letter replaces the 16Dec2013 (Revised 17Dec2013) Service Letter. Changes have been made to the Action Required.

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TERMINATION DATE

31Oct2015

PROBLEM

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The existing hydraulic brake cooling tubes can crack and fail on certain 793D and 793F Off-Highway Trucks. If the existing tube fails, it will result in high brake temperatures.

AFFECTED PRODUCT

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Model	Identification Number
*****Group 1*****
793F	SSP00112-00984
793F CMD	RBT00111-00171
793F XQ	SND00100-00131

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*****Group 2*****
793D	FDB00105-01813

PARTS NEEDED

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Qty	Part Number	Description
*****Group 1*****
2	1H0474	SEAL-O-RING (After Failure Only - As Required)
2	5F3092	SEAL-O-RING (After Failure Only - As Required)
1	1023482	GASKET
1	2938183	TUBE AS (After Failure Only - As Required)
1	3677901	TUBE AS (After Failure Only - As Required)
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 15% 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*****
2	1H0474	SEAL-O-RING (After Failure Only - As Required)
2	5F3092	SEAL-O-RING (After Failure Only - As Required)
1	2042635	GASKET
1	2474808	TUBE AS (After Failure Only - As Required)
1	3526043	TUBE AS (After Failure Only - As Required)
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 15% 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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Before Failure Inspection Only:

When performing a scheduled oil change, while the tank is empty, remove the access panel and inspect two brake cooling tubes for cracks at or near the flange. Refer to Image1. If no cracks are found, this Rework Procedure is completed. If the inspection reveals a cracked tube, replace the failed tube with a new tube (current part).

After Failure:

We believe that most tube failures are due to misalignment of the tube and pump. Follow these steps when replacing a failed tube.
1. Loosen all bolts, pump to tank, support bracket to tank, and support bracket to pump holding the pump in place.
2. Remove failed tube assembly and install new tube assembly (current part) to the pump and tighten.
3. Then adjust to center the tube in the hole in the block on tank wall.
4. Tighten the pump to tank bolts taking care not to change alignment of tube in hole.
5. Adjust the support plate so that it sits flat against both the bottom of the tank and the end of the pump stack.
6. Tighten the bolts in support plate to tank bottom.
7. Tighten the bolts in support plate to end of pump stack.

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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*****
0-24000 hrs, 0-48 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

NOTE: This is a 2.0-hour job for Group 1
2.0 hours is allowed for inspection of the tubes. An additional 2.0 hours is allowed if a failed part is found during an inspection. An allowance of 6.0 total hours can be applied if a failure occurs outside of a scheduled oil change interval.

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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*****
0-24000 hrs, 0-48 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

NOTE: This is a 2.0-hour job for Group 2
2.0 hours is allowed for inspection of the tubes. An additional 2.0 hours is allowed if a failed part is found during an inspection. An allowance of 6.0 total hours can be applied if a failure occurs outside of a scheduled oil change interval.