PRODUCT SUPPORT PROGRAM FOR REWORKING THE LUBE PUMP SPLINE ADAPTER ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REWORKING THE LUBE PUMP SPLINE ADAPTER ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS

Usage:

TEBE8249-01

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01Oct2018

(Revised 17Mar2019)

U-549

A-400

D-478

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Before/After	PRODUCT SUPPORT PROGRAM FOR REWORKING THE LUBE PUMP SPLINE ADAPTER ON CERTAIN 794 AC OFF-HIGHWAY TRUCKS
7755 5073 5070 5055 5083		PS46019

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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 "PS46019" 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 01Oct2018 Service Letter. Changes have been made to the Parts Needed.

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TERMINATION DATE

31Oct2020

PROBLEM

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The existing spline adapter, between the 397-9577 Lube Pump and the 303-9326 Fan Pump, can slide and disconnect the lube pump, on certain 794 AC Off-Highway Trucks. If the lube pump is disconnected, lubricant no longer flows to the pump drive box. Without lubricant the pump drive box can seize, breaking the drive shaft or other associated components.

AFFECTED PRODUCT

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Model	Identification Number
794 AC	HRT00100-00101 MN500051 MT500102-00107, 119-138

PARTS NEEDED

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Qty	Part Number	Description
1	9C4937	BREATHER AS
1	4548452	RING-RETAINING
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 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%
0-12000 hrs, 0-24 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

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NOTE: This is a 6.0-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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Prepare the machine for maintenance. Refer to SEBU9099, Operation and Maintenance Manual, "Prepare the Machine for Maintenance".

1. Remove existing lube pump (3). Refer to UENR2271, Disassembly and Assembly, "Gear Pump (Pump Drive Lubrication) - Remove and Install", for additional information.

Location of Components:

(1) Pump Drive Box
(2) 309-9326 Fan Pump
(3) 397-9577 Lube Pump
(4) Breather
(5) Mounting Area

Image1.2.1

2. Remove and retain bolt (A) and spline adapter (B) on 397-9577 Lube Pump (3). Refer to Image1.3.1.

Image1.3.1

3. Machine a retaining ring groove into spline adapter (B). Refer to the specifications in Image1.4.1.

Image1.4.1

4. Install new 454-8452 Retaining Ring (6) into the new groove in spline adapter (B). Re-install spline adapter (B) to 397-9577 Lube Pump (3) and secure with retaining bolt (A).

5. Tighten retaining bolt (A) to a specified torque of 30 N.m (22 lb ft). Refer to Image1.5.1.

Image1.5.1

6. Re-install 397-9577 Lube Pump (3). Refer to UENR2271, Disassembly and Assembly,"Gear Pump (Pump Drive Lubrication) - Remove and Install", for additional information.

7. Run the machine at low idle and check for leaks. Make any necessary adjustments/ repairs.

8. Check the hydraulic oil level and add oil, as required. Refer to SEBU9099, Operation and Maintenance Manual, "Hydraulic Tank Oil Level - Check - Brake, Steering, and Hoist Oil", for additional information.

9. Inspect breather (4) at mounting area (5) for oil or oily dust build up.

10. If oil or oily dust are present, replace the breather with a new 9Y-5011 Air Breather and clean mounting area (5).