ZF 0501.222.760 SCREW PLUG for WG100/WG130/WG131

Overview

The ZF 0501.222.760 SCREW PLUG is a critical sealing component designed for the sump and housing bores of ZF WG series transmissions, specifically the WG100, WG130, and WG131 models. This OEM genuine part ensures a leak-proof seal at the drain or fill port, preventing contamination ingress and fluid loss that can compromise hydraulic pressure. The SKU 0501.222.760 is precision-machined to match the original factory thread pitch and torque specifications, making it a direct replacement for worn or damaged plugs. It sits directly in the transmission pan or housing, often adjacent to the DIFFERENTIAL HOUSING assembly, where maintaining oil integrity is essential for gear and bearing longevity.

Symptoms of Failure

When the ZF 0501.222.760 screw plug wears out or its sealing face becomes damaged, operators may notice several distinct failure modes. Oil seepage around the plug head is the most common symptom, often visible as a slow drip after the transmission reaches operating temperature. Contaminated transmission fluid can occur if the plug loosens, allowing dirt and moisture to enter the housing. Intermittent low-pressure warnings may appear on the dash if fluid loss becomes significant, leading to erratic shifting. Corrosion or thread galling on the plug body can make removal difficult and may require replacement of the entire DIFFERENTIAL HOUSING if the bore is stripped.

Technical Specifications

Compatibility

This screw plug is specifically engineered for ZF WG series transmissions, including the WG100, WG130, and WG131 models. It also fits select variants of the WG180 and WG200 series where the same M22 thread pattern is used for drain or fill ports. The plug is often replaced during differential service intervals, particularly when the DIFFERENTIAL or CROWN WHEEL is being inspected. For applications using the DIFFERENTIAL assembly, this plug ensures the housing remains sealed against high-pressure oil splash.

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