The Valve Compensator Could Fail on Certain E, F, and F2 Series Backhoe Loaders. {5051} Caterpillar

Backhoe Loader

415F2 (S/N: HWA1-UP)

416E (S/N: MFG6001-UP)

416F (S/N: KSF1-UP; LWT1-UP)

416F2 (S/N: LYA1-UP; HWB1-UP)

420F (S/N: LTG1-UP; LKH1-UP; JWJ1-UP; SKR1-UP)

420F2 IT (S/N: LYC1-UP; HWD1-UP)

420F2 ST (S/N: LYB1-UP; HWC1-UP)

430F (S/N: RDF1-UP; LNH1-UP; RGS1-UP; LDY1-UP)

430F2 IT (S/N: LYE1-UP; HWG1-UP)

430F2 ST (S/N: HWE1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Reference: Special Instruction, M0084617, "Rework Procedure to Add Adjustable Pressure Reducing Valve on Certain Backhoe Loaders"

Problem

The 350-8841 Compensator Kit may fail on certain E, F, and F2 series backhoe loaders. The failures have been seen especially on machines equipped with competitive hammers or hammers that are direct acting (no accumulator installed).

Solution

If a determination is made that the compensator kit failure is due to a work tool on the machine, for example a direct acting hammer, a pressure reducing valve installed on the auxiliary line can help protect the compensator kit. Refer to Special Instruction M0084617 that provides instructions on how to install the pressure reducing valve. The compensator kit may be removed from the auxiliary valve that is running the work tool causing the damage. Doing so may degrade performance during multifunctioning of the hoe functions. When the work tool is no longer needed, you are advised to install the compensator kit back to the auxiliary control valve.