PRODUCT SUPPORT PROGRAM FOR INSTALLING THE TIE ROD ASSEMBLY AND REPLACING THE MAIN DRIVESHAFT UNIVERSAL JOINTS ON CERTAIN 793F OFF HIGHWAY TRUCKS Caterpillar

PRODUCT SUPPORT PROGRAM FOR INSTALLING THE TIE ROD ASSEMBLY AND REPLACING THE MAIN DRIVESHAFT UNIVERSAL JOINTS ON CERTAIN 793F OFF HIGHWAY TRUCKS

Usage:

TEBE7602-01

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11May2018

(Revised 17Jul2018)

N050
N053
N057

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Containment - Before/After (Limited distribution)	PRODUCT SUPPORT PROGRAM FOR INSTALLING THE TIE ROD ASSEMBLY AND REPLACING THE MAIN DRIVESHAFT UNIVERSAL JOINTS ON CERTAIN 793F OFF HIGHWAY TRUCKS
3253 3251 7051 3260 3082 3281 3160 3064 3030 0679		PS90879

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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 Containment Program can be administered either before or after a failure occurs. In either case the decision whether to apply the Program is made by the dealer and service rep. Obtain the service reps Goodwill Approver Code before completing the repair. EAME dealers should use their standard Industry Group specific goodwill approval codes. The Goodwill Approver Code must be included when submitting the claim.

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NOTE:	When reporting the repair, use "PS90879" as the Part Number and "7777" as the Group Number. If administered before failure, use "56" as Warranty Claim Description and "T" as the SIMS Description Code. If administered after failure, use "96" as Warranty Claim Description Code and use "Z" as the SIMS Description Code.
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 11May2018 Service Letter. Changes have been made to the Service Claim Allowances.

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TERMINATION DATE

30Nov2019

PROBLEM

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The existing universal joint can prematurely fail due to vibration on certain 793F Off Highway Trucks. If the existing universal joint fails, it can fail leading to additional machine damage, include transmission case failures.

AFFECTED PRODUCT

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Model	Identification Number
793F	SSP00118-00123, 162-163, 175, 181, 233, 242, 269, 274-278, 286-287, 297, 304-305, 333-334, 436, 438, 473-474, 490, 492-493, 497, 499, 509, 663, 705-706, 714, 997, 1002

PARTS NEEDED

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Qty	Part Number	Description
2	8D3791	PIN
3	8T0360	BOLT
2	1508355	UNIV JOINT AS
16	1567993	BOLT-HEX HEAD
3	1984769	WASHER-HARD
3	2264192	WASHER - HARD
1	4598466	PLATE AS
2	4598467	PIN
1	4604882	PLATE AS
1	4649177	TIE ROD AS
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 32% 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 Service Manual if/as necessary. Replace the universal joint per KENR8397.
Install the tie rod assembly and plates per Special Instructions SEHS0006 "Procedure to Install a Rear Axle Tie Rod Stiffener to the 793F Off-Highway Truck". The tie rod assembly will connect the rear axle and transmission.
This will create a stiffer drivetrain that will be less susceptible to vibration issue, which will extend u-joint service life.
Perform a visual inspection for cracks on the welded joint near the transmission case flange. A crack can possibly form in the weld between the gussets on the right and left side of the transmission case. Please see diagrams below. Clean the area and inspect for visible cracks or signs of oil leakage.

If a crack is found, please have the Dealer Technical Communicator create a DSN (Dealer Solution Network) Product Health Service Request with this publication mentioned in the description, and attach quality photos prior to submitting to Caterpillar for repair assistance.

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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%
0-50000 hrs, 0-60 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

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NOTE: This is a 9.0-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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