PRODUCT SUPPORT PROGRAM FOR REPLACING THE SIGNAL RELIEF VALVE ON CERTAIN 374D L, 390D L, 374D OEM, AND 390D L OEM HYDRAULIC EXCAVATORS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING THE SIGNAL RELIEF VALVE ON CERTAIN 374D L, 390D L, 374D OEM, AND 390D L OEM HYDRAULIC EXCAVATORS

Usage:

TEBE0864-01

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03Feb2014

(Revised 08Jan2015)

U-53

A-36

D-49

O-47

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After Failure Only	PRODUCT SUPPORT PROGRAM FOR REPLACING THE SIGNAL RELIEF VALVE ON CERTAIN 374D L, 390D L, 374D OEM, AND 390D L OEM HYDRAULIC EXCAVATORS
3208 5069 5117		PS52602

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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 can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS52602" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "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 03Feb2014 Service Letter. Changes have been made to the wording of the Problem and Action required.

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TERMINATION DATE

29Feb2016

PROBLEM

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The existing signal relief valve can lose the pressure setting on certain 374D L, 390D L, 374D OEM, and 390D L OEM Hydraulic Excavators. If the existing signal relief valve fails, the pressure setting of the valve can move down slowly causing a lack of power or a low implement response of the machine.

AFFECTED PRODUCT

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Model	Identification Number
374D L	PAP00121-00336 PAS00131-00204, 400-931 PAX00111-00164, 300-459
374D OEM	JNZ00100-00153
390D L	WAG00131-00287 WAP00171-00614 WBT00141-00312
390D L OEM	M1M00100-00110, 10010

PARTS NEEDED

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Qty	Part Number	Description
1	1175270	VALVE GP-RLF -A
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 1% 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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Check the hydraulic oil pressure setting of the signal relief valve. Refer to Image1 and 2.

Refer to the following documentation in Service Information System:

? 374D Excavator Hydraulic system, KENR7775, Testing and Adjusting
? 390D Excavator Hydraulic system, KENR 7735, Testing and Adjusting

If the hydraulic oil pressure setting of the signal relief valve is not correct, an adjustment needs to be performed.

If the adjustment of the signal relief valve is not possible, pressure is not stable, or valve is noisy, the signal relief valve needs to be replaced by a new one.

Important: Perform the necessary safety precautions when replacing the valve. Refer to your machine's Operation and Maintenance Manual, for additional information.

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Image1

Image2

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, 0-36 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%