Lift Cylinder Head Seals May Leak on Certain F Series Backhoe Loaders {5102, 7562} Caterpillar

Backhoe Loader

415F2 (S/N: HWA1-UP)

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

416F2 (S/N: LYA1-UP; HWB1-UP; LBF1-UP)

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

420F2 (S/N: LBS1-UP)

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

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

422F (S/N: LRH1-UP)

422F2 (S/N: LYF1-UP)

427F2 (S/N: HWK1-UP)

428F2 (S/N: LYG1-UP)

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

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

430F2 ST (S/N: LYD1-UP; HWE1-UP)

432F (S/N: SEJ1-UP; LNR1-UP; PXR1-UP)

432F2 (S/N: LYJ1-UP; HWP1-UP)

Introduction

The problem that is identified below has a known permanent solution. use the solution that is identified below.

Problem

Certain Backhoe Loader machines may experience excessive leakage from the cylinder head or rod seals, due to contamination ingress through the wiper seal, which prevents the u-cup seal from properly sealing.

Solution

Upgrade the wiper seal to a press-in design to eliminate the leak at the outer diameter of the seal and also provide more sealing load on the rod. This press-in design also requires a new head part number to accommodate the new wiper seal. The new seal requires loctite be applied to the seal pocket and the seal will need to be pressed in the bore. Seal kit 324-0356 or the seals in this kit other than the wiper will have to be ordered to complete the head rebuild.