ZF 0636.307.025 SCREW PLUG for WG65 | OEM Genuine Part

Overview

The ZF 0636.307.025 SCREW PLUG is a critical sealing component engineered specifically for the WG65 series transmission. This OEM genuine part functions as a threaded closure within the transmission housing, preventing fluid loss and maintaining hydraulic pressure in the valve body and sump areas. The SKU 0636.307.025 is precision-machined to interface seamlessly with the TRANSMISSION HOUSING, ensuring a leak-proof seal under high-temperature and high-vibration conditions common in heavy-duty industrial applications.

Symptoms of Failure

When the ZF 0636.307.025 screw plug degrades or becomes damaged, operators may encounter these specific failure indicators:

• Oil seepage around the plug threads – A visible film of transmission fluid accumulating near the plug location, often mistaken for a housing crack.
• Intermittent pressure drops – The transmission may hesitate or slip during gear engagement due to loss of hydraulic integrity at the plug point.
• Contaminated fluid ingress – Dirt or moisture entering the system through a compromised plug seal, leading to premature wear of internal components like the FILTER INSERT.
• Audible air hissing – A faint whistle or hiss from the transmission housing during operation, indicating the plug is no longer creating a vacuum seal.

Technical Specifications

Compatibility

This screw plug is designed for the ZF WG65 series, but its thread pattern and sealing geometry also make it suitable for select WG180, WG200, and WG250 models when used in conjunction with the correct O-RING and SEALING RING. Always verify fitment with your transmission housing casting number. The plug is commonly paired with HEXAGON SCREW (0636011038) and HEXAGON SCREW (0636011118) for secure mounting, while the HEXAGON SCREW (0636016015) is used in adjacent cover assemblies.

Related Components