ZF 0636.011.202 HEXAGON SCREW for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 0636.011.202 HEXAGON SCREW is a critical OEM genuine fastener engineered for secure clamping within the differential and axle housing assemblies of ZF’s heavy-duty WG-series transmissions. This hexagon screw, identified by SKU 0636.011.202, is specifically used to retain bearing caps, differential housings, and internal gear sets in the WG100, WG130, and WG131 models. By maintaining precise preload on components such as the 2095109020 DIFFERENTIAL and the 0750117075 TAPER ROLLER BEARING, this screw prevents axial movement and ensures consistent gear mesh alignment under high torque loads.

Symptoms of Failure

• Oil seepage from differential housing bolts: When the hexagon screw loosens or fatigues, the seal between the 2095309059 DIFF.HOUSING and the main case is compromised, leading to visible oil leaks around the fastener points.
• Intermittent gear slipping under load: A worn or stripped hexagon screw cannot maintain proper bearing preload, causing the 2095209037 DIFFERENTIAL to shift slightly during operation, resulting in momentary power loss or clunking.
• Abnormal vibration at highway speeds: Loss of clamping force allows the taper roller bearing to develop excessive endplay, transmitting vibration through the driveline that intensifies with speed.
• Metallic debris in transmission fluid: As the screw loosens, fretting wear occurs between the screw head and the housing, shedding fine metal particles into the lubricant.

Technical Specifications

Compatibility

This hexagon screw is a direct OEM replacement for the following ZF transmission models: WG100, WG130, and WG131. It is also commonly used in the differential sub-assemblies of WG180 and WG200 series transmissions where the same thread pitch and clamping load are required. Always verify the thread length and head style against your existing fastener before installation.

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