Overview
The ZF 0636.101.051 CAP SCREW is a critical fastening component engineered specifically for the WG65 and WG251 series transmissions. This OEM genuine part secures the housing assembly to the main transmission casing, ensuring precise clamping force is maintained under high-torque conditions. The SKU 0636.101.051 is positioned at the interface between the 4108101061: HOUSING and the transmission body, where it prevents relative movement and maintains structural integrity. Without this cap screw, the entire gear train alignment can shift, leading to premature wear of internal components.
Symptoms of Failure
- Transmission fluid seepage at the housing joint: A loose or fatigued cap screw allows the 4108201156: HOUSING to separate microscopically, causing oil to weep along the mating surface.
- Audible knocking during gear engagement: When the cap screw loses preload, the housing can shift under load, producing a metallic clatter that worsens with acceleration.
- Vibration through the shift lever: Worn threads or a stripped cap screw head cause uneven clamping, transmitting harmonic vibrations into the cab during highway speeds.
- Gradual gear slippage under heavy load: As the housing loosens, the 4108301304: BEARING COVER loses its axial location, allowing the input shaft to drift and interrupt power flow.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.101.051 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 35 mm |
| Head Type | Hexagon socket (Allen) |
| Material | Alloy steel, 10.9 grade |
| Surface Treatment | Zinc-plated, yellow passivated |
| Weight | 0.04 kg |
| OEM Reference | ZF 0636.101.051 |
| Torque Specification | 45 Nm (dry), 38 Nm (lubricated) |
Compatibility
This cap screw is a direct fit for the ZF WG65 and WG251 transmission families. It is also commonly used in the WG180, WG200, and WG210 series where the same housing bolt pattern is employed. The part interfaces directly with the 4108306173: GASKET to seal the joint, and it should be replaced whenever the housing or bearing cover is serviced. For complete transmission rebuilds, verify compatibility with your specific model using the OEM parts catalog.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101061 | HOUSING | Encloses the gear train and supports shafts |
| 4108201156 | HOUSING | Secondary housing for clutch pack assembly |
| 4108301304 | BEARING COVER | Retains input shaft bearing in position |
| 4108306173 | GASKET | Seals housing-to-transmission interface |
| 0730365280 | TYPE PLATE | Identification plate with transmission serial |
| 0631311009 | GROOVED STUD | Alignment stud for housing positioning |
| 4108301339 | INPUT SHAFT | Transfers engine torque into transmission |
| 0750116277 | BALL BEARING | Supports input shaft radial load |
| 0630502039 | RETAINING RING | Locks bearing in housing bore |
| 0630000041 | SHIM RING | Adjusts bearing preload and end play |
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