PRODUCT SUPPORT PROGRAM FOR INSPECTING AND POSSIBLY REWORKING THE HARNESS CONNECTION TO THE TRANSMISSION OUTPUT SPEED SENSORS ON CERTAIN 793F, 793F XQ, 793F CMD, 797A, 797B, 797F, 797F XQ OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT SUPPORT PROGRAM FOR INSPECTING AND POSSIBLY REWORKING THE HARNESS CONNECTION TO THE TRANSMISSION OUTPUT SPEED SENSORS ON CERTAIN 793F, 793F XQ, 793F CMD, 797A, 797B, 797F, 797F XQ OFF-HIGHWAY TRUCKS

Usage:

TEBE2036-02

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25Sep2014

(Revised 01Dec2014)

U-557

A-417

D-501

O-476

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Before/After	PRODUCT SUPPORT PROGRAM FOR INSPECTING AND POSSIBLY REWORKING THE HARNESS CONNECTION TO THE TRANSMISSION OUTPUT SPEED SENSORS ON CERTAIN 793F, 793F XQ, 793F CMD, 797A, 797B, 797F, 797F XQ OFF-HIGHWAY TRUCKS
1439 3175 1408 1634 3104 3030		PS44490

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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 "PS44490" 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 25Sep2014 (Revised 01Oct2014) Service Letter. Changes have been made to the Problem and Rework Procedure.

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TERMINATION DATE

30Sep2016

PROBLEM

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The harness connection to the transmission output speed sensors 1 and 2 need to be inspected and possibly reworked on certain 793F, 793F XQ, 793F CMD, 797A, 797B, 797F, 797F XQ off-highway trucks. The existing harness connectors may be wired backwards from the factory.

797 and 797B Trucks: These trucks do not use the new software, inspect per instructions.

On F-Series Trucks Only:

If the truck has Power Train Software Gp 464-8205 or later installed (see Service Magazine Article SEPD1841), and there are CID 585-7 and CID 673-7 Level 1 Diagnostics, refer to the rework procedure in this letter to correct the diagnostic code.

If the truck has Power Train Software Gp 464-8205 or later installed (see Service Magazine Article SEPD1841), and there are NO CID 585-7 and CID 673-7 Level 1 Diagnostics, the Transmission Output Speed Sensors are connected correctly. No rework or inspection is required.

If the truck has a Power Train Software Gp version previous to 464-8205 installed(see Service Magazine Article SEPD1841), the following procedure can be followed to inspect the connections and correct the fault if necessary.

AFFECTED PRODUCT

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Model	Identification Number
793F	SSP00112-00124, 919-977
793F CMD	RBT00165-00171
793F XQ	SND00100-00131
797	5YW00193-00277
797B	JSM00123-00488
797F	LAJ00141-00363
797F XQ	WSP00100-00114

PARTS NEEDED

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No parts needed for this program

ACTION REQUIRED

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Refer to the Service Manual if/as necessary and see 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%
0-6000 hrs, 0-12 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
6001-12000 hrs, 13-24 mo	33.0%	100.0%	0.0%	0.0%	50.0%	0.0%
12001-21000 hrs, 25-42 mo	33.0%	100.0%	0.0%	0.0%	50.0%	0.0%

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NOTE: This is a 1.0-hour job

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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. Prepare machine for maintenance. Refer to the machine's Operation and Maintenance Manual, "Prepare the Machine for Maintenance".

2. Ensure that the oil in the rear axle housing is not overfull and at the correct level. Adjust oil level if necessary. Refer to the machine's Operation and Maintenance Manual, "Differential and Final Drive Oil Level - Check".

3. On 797 models only disconnect the transmission output speed sensor harness on the differential access cover. Refer to Image 1.1.1.

Image1.1.1

4. Remove differential access cover and retain hardware. See Image 1.2.1 for 797 differential access cover and Image 1.2.2 for 793 differential access cover.
Note: Care must be taken to protect the differential against contamination with the cover removed.

Image1.2.1

Image1.2.2

5. Inspect the harness connections to the transmission output speed sensors.

-797, 797B, and 797F Transmission output speed sensor #1 (bottom sensor) should be connected to the harness breakout that includes wires E901-GN and E900-WH. Transmission output speed sensor #2 (upper sensor) should be connected to the harness breakout that includes wires E907-GY and E906-OR. See Image 1.3.1 for 797 example.

-793F Transmission output speed sensor #1 (bottom sensor) should be connected to the harness breakout that includes wires E900-YL and E901-GN. Transmission output speed sensor #2 (upper sensor should be connected to the harness breakout that includes wires E906-OR and E907-GY. See Image 1.3.2 for 793 example.