PRODUCT SUPPORT PROGRAM FOR INSPECTING, AND IF NEEDED, REWORKING THE DIFFERENTIAL RELIEF VALVE ON CERTAIN 385C FS, 374D, AND 390D EXCAVATORS Caterpillar

PRODUCT SUPPORT PROGRAM FOR INSPECTING, AND IF NEEDED, REWORKING THE DIFFERENTIAL RELIEF VALVE ON CERTAIN 385C FS, 374D, AND 390D EXCAVATORS

Usage:

REBE7638-02

Show/hide table

08Nov2011

(Revised 17Nov2011)

U-492

A-403

D-433

O-436

Show/hide table

*Before/After*	PRODUCT SUPPORT PROGRAM FOR INSPECTING, AND IF NEEDED, REWORKING THE DIFFERENTIAL RELIEF VALVE ON CERTAIN 385C FS, 374D, AND 390D EXCAVATORS
5069 5117		PS43430

Show/hide table

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 "PS43430" 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.

Show/hide table

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.

Show/hide table


NOTE:	This Revised Service Letter replaces the 08Nov2011 (Revised 14Nov2011) Service Letter. Changes have been made to the Title.

Show/hide table

TERMINATION DATE

30Nov2013

PROBLEM

Show/hide table

A lack of hydraulic power may occur due to an internal leak of the 144-7113 Differential Relief Valve on certain 385C FS, 374D, and 390D Excavators. An incorrect 4K-1388 O-Ring seal, that is too small and too thick, could have been installed on the 144-7113 Differential Relief Valve.

AFFECTED PRODUCT

Show/hide table

Model	Identification Number
374D L	PAP00164-00172, 175-201 PAS00411-00520, 522-529, 531 PAX00308-00337, 339-344 PJA00144
374D OEM	JNZ00107-00116, 118
385C FS	EAM00314 MMA00284-00286
390D	BYP00125-00126 KCZ00154-00160
390D L	WAG00153-00170, 173-176, 178-179 WAP00207-00300, 302-306, 308-310, 312 WBT00163-00198
390D L OEM	M1M00102-00105

PARTS NEEDED

Show/hide table

Qty	Part Number	Description
2	4J0519	SEAL-O RING
2	1702414	RING-BACKUP
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

Show/hide table

Remove the two 144-7113 Differential Relief Valves. Remove the 4K-1388 O-Ring Seal and replace with the new 4J-0519 O-Ring Seal and the 170-2414 Backup Ring.

Show/hide table

SERVICE CLAIM ALLOWANCES

Show/hide table

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%
0-3000 hrs, 0-12 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
3001-6000 hrs, 13-24 mo	33.0%	50.0%	0.0%	0.0%	50.0%	50.0%

Show/hide table

NOTE: This is a 3.0-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.

Show/hide table

PARTS DISPOSITION

Show/hide table

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

Rework Procedure

Show/hide table

For 374D machines, remove the 256-1503 Cover Group in order to access the main control valve. Refer to Image1.1.1.

For 385C and 390D machines, do not remove the 184-9085 Cover Group. There is sufficient access to complete the rework procedure. Refer to Image1.1.2.

Image1.1.1

Image1.1.2

Image1.2.1 shows the differential relief valve location on the machines.

Image1.2.2 shows a suggested tool that should be used in order to remove and assemble the 144-7113 Differential Relief Valve. The tool is available in Snap-On Tools catalog. (Ref: AN850824B).

Image1.2.1

Image1.2.2

1. Loosen the 144-7113 Differential Relief Valve.

2. Remove the two 144-7113 Differential Relief Valves. Remove the 4K-1388 O-Ring Seal and install a new 4J-0519 O-Ring Seal. Replace the 170-2414 Backup Ring. Refer to Image1.4.1.