ZF 0636.104.255 CAP SCREW for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 0636.104.255 CAP SCREW is a precision-engineered fastener designed to secure critical housing assemblies within the WG100, WG130, and WG131 transmission series. This OEM genuine part, identified by SKU 0636.104.255, functions as a load-bearing retention element, clamping the transmission housing sections together to maintain structural integrity under high torque and thermal cycling. It sits at the interface between the main housing and the HOUSING COVER, ensuring proper alignment and preventing axial displacement of internal components. Without this cap screw, the transmission’s oil galleries and gear train alignment would be compromised, leading to rapid wear.

Symptoms of Failure

• Transmission fluid seepage at housing joints: When the cap screw loses preload, the seal between the HOUSING and adjacent covers degrades, causing slow oil leaks that worsen over time.
• Audible gear rattle or clunking during shifts: A loose or fatigued cap screw allows micro-movement between housing sections, producing metallic noise under load changes.
• Gradual loss of hydraulic pressure: If the screw fractures, the housing gap increases, reducing pump suction efficiency and causing delayed engagement.
• Vibration at specific RPM ranges: Uneven clamping from a stripped thread creates resonance in the HOUSING KIT assembly, felt through the chassis.

Technical Specifications

Compatibility

This cap screw is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It is also compatible with the WG180 and WG200 series when used in conjunction with the HOUSING variant 4699301254. The screw fits all standard housing bolt patterns on these units, including those retrofitted with the 4699298049 HOUSING KIT. Always verify thread pitch against your existing fastener before installation.

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