ZF 0730.002.626 WASHER for WG65 | OEM Genuine Part

Overview

The ZF 0730.002.626 WASHER is a precision-engineered OEM genuine component specifically designed for the WG 65 Series transmission. This hardened steel washer functions as a critical load-spreading interface between fasteners and the transmission housing, ensuring uniform clamping force during high-torque operations. Located within the main gear assembly, the SKU 0730.002.626 prevents galling and distributes stress across mating surfaces, directly supporting the structural integrity of the TRANSMISSION HOUSING. Without this washer, bolt preload can degrade rapidly under thermal cycling and vibration.

Symptoms of Failure

• Progressive oil seepage at bolt interfaces: A worn 0730.002.626 washer loses its crush resistance, allowing fluid to migrate past the HEXAGON SCREW heads, leading to visible wet spots on the housing exterior.
• Audible clicking or ticking during gear engagement: When the washer deforms unevenly, micro-movement occurs between the HEXAGON SCREW and housing, creating a distinct metallic chatter under load.
• Reduced clamping torque retention: A collapsed washer causes the HEXAGON SCREW to loosen over time, resulting in gear train misalignment and premature bearing wear.
• Visible surface cracking or flattening: Inspection reveals the washer has exceeded its elastic limit, often accompanied by fretting corrosion on the mating face.

Technical Specifications

Compatibility

This washer is a direct-fit OEM replacement for the ZF WG 65 Series transmission. Based on its dimensional profile and load rating, it is also compatible with the WG 80, WG 120, and WG 180 models where similar M18 bolt patterns are used on the main housing flange. For the WG 200 and WG 250 series, verify bolt diameter and stack height before installation, as these variants may require a thicker washer (ZF 0730.002.627). Always cross-reference your transmission serial number with the ZF parts catalog.

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