ZF 1240.304.117 WASHER for WG65 | OEM Genuine Part

Overview

The ZF 1240.304.117 WASHER is a precision-engineered OEM genuine component designed specifically for the WG 65 Series transmission. This hardened steel washer functions as a critical load-spreading interface between fasteners and transmission housing surfaces, ensuring proper torque retention and preventing galling during high-vibration operation. As part of the WG65 output assembly, the SKU 1240.304.117 sits directly beneath the 4616105415: OUTPUT and the 4616303144: OUTPUT FLANGE, where it maintains axial clearance and distributes clamping forces evenly across the 4616101094: TRANSMISSION HOUSING.

Symptoms of Failure

• Transmission oil weeping from output flange area — A worn or deformed 1240.304.117 washer allows the 0636011038: HEXAGON SCREW to loosen, creating a gap that permits ATF seepage past the seal.
• Audible clicking or knocking during gear engagement — When the washer collapses beyond tolerance, axial play develops between the output shaft and housing, producing metallic contact noises under load.
• Vibration at highway speeds (40-65 mph) — A fatigued washer fails to maintain proper preload on the output flange, allowing rotational imbalance that transmits through the driveline.
• Torque loss on output flange fasteners — Repeated thermal cycling causes the washer to embed into softer housing materials, reducing clamp force and requiring frequent retorquing.

Technical Specifications

Compatibility

This washer is engineered for the ZF WG 65 Series, but its dimensions and load rating make it suitable for several other ZF powershift transmissions that share the same output flange architecture. Compatible models include the WG65, WG120, WG180, and WG200 series. Always verify fitment by cross-referencing your transmission’s parts manual, as the 1240.304.117 is also used in certain ZF Ecomat 4HP and 5HP automatic transmissions where the output flange mounting pattern matches.

Related Components