ZF 4108.301.373 SCREW PLUG for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4108.301.373 SCREW PLUG is a precision-engineered sealing component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part functions as a critical closure element within the transmission housing, preventing fluid egress and maintaining internal pressure integrity. The SKU 4108.301.373 is specifically positioned in the lower sump area or side casing ports where it seals access points used during assembly or maintenance. When installed alongside the 4108101076 HOUSING, this screw plug ensures that lubricant remains contained under high torque and thermal cycling conditions.

Symptoms of Failure

• Oil seepage around the plug perimeter: A worn or improperly torqued 4108.301.373 screw plug often manifests as slow, persistent transmission fluid leaks, particularly visible on the exterior of the 4108201217 HOUSING.
• Contaminated fluid ingress: When the plug’s sealing face degrades, dirt and moisture can enter the transmission, leading to accelerated wear of internal components like the 4108301304 BEARING COVER.
• Intermittent low-pressure warnings: A compromised screw plug can cause gradual pressure loss in the hydraulic system, triggering dashboard alerts or erratic shift behavior.
• Corrosion or thread galling: Over time, the plug’s threads may seize or corrode, making removal difficult and risking damage to the 4108306173 GASKET surface.

Technical Specifications

Compatibility

This screw plug is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It is also suitable for select WG180 and WG200 variants where the same port thread pattern is used. Always verify thread pitch and sealing surface condition against the 4108301345 INPUT SHAFT assembly drawings before installation.

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