ZF 0730.002.391 WASHER for WG100/WG201 | OEM Genuine Part

Overview

The ZF 0730.002.391 WASHER is a precision-engineered OEM component designed for the WG100 and WG201 series transmissions. This hardened steel washer functions as a critical load-spreading element between the transmission housing and fastening hardware, ensuring proper clamp load distribution during high-torque operation. Installed within the main gear train assembly, the SKU 0730.002.391 prevents galling between mating surfaces and maintains axial clearance tolerances. When replacing this washer, technicians often inspect the adjacent TRANSMISSION HOUSING (4644101160) for wear patterns, as both components share the same load path.

Symptoms of Failure

• Transmission oil seepage at housing joints: A worn or deformed washer reduces clamping force, allowing lubricant to escape past the TRANSMISSION HOUSING (4644301323) mating surfaces.
• Audible metallic clicking during gear engagement: Excessive axial play from a collapsed washer causes gear train components to shift, producing intermittent noise under load.
• Gradual gear slipping under heavy torque: Insufficient washer thickness alters the preload on the THREADED BUSH (4644301189), leading to reduced friction grip in the clutch packs.
• Visible fretting corrosion on housing flanges: Micro-movement between the washer and housing face accelerates surface degradation, often accompanied by metallic debris in the oil filter.

Technical Specifications

Compatibility

This washer is specifically engineered for ZF WG100 and WG201 series transmissions, including the WG180, WG200, and WG210 variants. It is also compatible with the WG120 and WG150 models where the same housing bolt pattern is used. The part interfaces directly with the SCREW PLUG (4475280043) in the oil gallery sealing assembly. For complete housing rebuilds, always pair this washer with a new O-RING (0634306198) to ensure leak-free operation.

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