ZF 4407.301.027 WASHER | OEM Genuine Part

Overview

The ZF 4407.301.027 WASHER is a precision-engineered OEM genuine component designed to maintain critical sealing pressure and axial alignment within ZF heavy-duty construction machinery transmissions. This hardened steel washer sits between the transmission housing and bearing assemblies, preventing metal-on-metal wear and ensuring proper load distribution. The SKU 4407.301.027 is frequently replaced during major transmission overhauls to restore factory tolerances. When installed alongside the 4143101009: HOUSING and 4143301025: HOUSING, this washer forms a critical interface that prevents fluid bypass and maintains hydraulic circuit integrity.

Symptoms of Failure

• Transmission fluid seepage at housing joints – A worn 4407.301.027 washer allows micro-movement between mating surfaces, causing gradual oil weeping around the 0634313603: O-RING seal.
• Abnormal gear engagement noise under load – When this washer loses its original thickness, axial play develops in the shaft assembly, producing a distinct clattering sound during low-speed operation.
• Intermittent pressure loss in hydraulic circuits – A collapsed or deformed washer disrupts the sealing force on the 4475280018: SCREW PLUG, leading to erratic clutch pack pressure.
• Premature bearing failure due to misalignment – The washer’s gradual compression alters shaft centerline alignment, accelerating wear on adjacent thrust bearings.

Technical Specifications

Compatibility

This washer is engineered for ZF WG-series transmissions commonly found in construction machinery including wheel loaders, excavators, and telehandlers. Compatible models include WG180, WG200, WG210, and WG220 series. It also fits select ZF 4WG-200 and 6WG-200 variants used in articulated dump trucks. Always verify the 4143298457: SEAL KIT compatibility when ordering replacement washers for complete transmission resealing.

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