ZF 4407.301.143 WASHER | OEM Genuine Part

Overview

The ZF 4407.301.143 WASHER is an OEM genuine thrust or sealing washer engineered for precise load distribution within the clutch pack and planetary gear assemblies of heavy-duty construction machinery transmissions. This component sits between rotating shafts and stationary housings to maintain critical axial clearances, preventing metal-on-metal contact that leads to premature wear. The SKU 4407.301.143 is a factory-specified replacement part that ensures exact fitment and material hardness for ZF power shift transmissions. When installed alongside the 4143101009: HOUSING and 4143301025: HOUSING, this washer forms a sealed boundary that contains hydraulic pressure and lubricant flow.

Symptoms of Failure

• Transmission oil leaks at housing seams: A worn 4407.301.143 washer allows pressurized fluid to bypass the 0634313603: O-RING seal, causing visible drips around the bell housing or PTO cover.
• Gear slipping under load: When the washer thickness degrades, clutch pack clearance increases, resulting in delayed engagement or complete torque loss during excavation or grading operations.
• Metallic debris in transmission fluid: Flattened or fractured washers shed steel particles that contaminate the hydraulic circuit, often detected during routine oil analysis.
• Abnormal whining or knocking from the transmission: Insufficient washer support allows shaft end-play, generating audible noise that worsens when shifting between forward and reverse gears.

Technical Specifications

Compatibility

This washer is a standard component in ZF WG180, WG200, and WG211 series power shift transmissions commonly used in wheel loaders, dozers, and telehandlers. It also fits select ZF 4WG-310 and 6WG-260 models where the clutch pack requires a hardened thrust washer between the sun gear and 4475280018: SCREW PLUG assembly. Always verify your transmission serial number against the OEM parts catalog before ordering.

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