Overview
The ZF 0636.302.056 SCREW PLUG is a critical sealing component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part, identified by SKU 0636.302.056, functions as a threaded closure that prevents fluid loss and contaminant ingress at key housing access points. Positioned within the transmission’s lubrication circuit, it ensures consistent hydraulic pressure by maintaining a sealed environment around the 4108101112: HOUSING and 4108201177: HOUSING assemblies. Without this plug, the entire lubrication system is compromised, leading to rapid wear of internal components.
Symptoms of Failure
When the ZF 0636.302.056 screw plug degrades, operators often encounter these specific failure modes:
- Persistent oil leaks at the housing drain port – A worn or stripped plug allows transmission fluid to escape, leaving visible puddles under the vehicle.
- Low hydraulic pressure causing gear slipping – Fluid loss reduces system pressure, resulting in delayed engagement or erratic shifting during load.
- Contamination of the 4108301304: BEARING COVER area – A loose plug permits dirt and moisture to enter, accelerating bearing wear and corrosion.
- Increased operating temperature – Insufficient fluid volume due to leakage forces the transmission to overheat, often triggering warning lights.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.302.056 |
| Thread Size | M18 x 1.5 (estimated) |
| Material | Steel with zinc plating |
| Weight | 0.04 kg (approx.) |
| OEM Reference | ZF 0636.302.056 |
| Sealing Type | Threaded with O-ring groove |
| Torque Specification | 25 Nm (recommended) |
Compatibility
This screw plug is specifically designed for ZF WG-series transmissions. It is a direct fit for the WG100, WG130, and WG131 models. Additionally, it may be used in the WG180 and WG200 series where the same housing geometry is present. Always verify the thread pattern against the 4108306173: GASKET surface to ensure a leak-proof seal. For high-mileage units, pairing this plug with a new 0750110040: SHAFT SEAL is recommended to restore full sealing integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101112 | HOUSING | Main transmission casing |
| 4108201177 | HOUSING | Secondary housing for clutch pack |
| 4108301304 | BEARING COVER | Protects output shaft bearings |
| 4108306173 | GASKET | Seals bearing cover interface |
| 0750110040 | SHAFT SEAL | Prevents fluid leakage at shaft exit |
| 4108102042 | INPUT | Input shaft assembly |
| 4108302099 | PLANET CARRIER | Supports planetary gear set |
| 4108302007 | BEARINGSHEET | Shim for bearing preload |
| 0635332196 | BALL BEARING | Radial support for rotating shafts |
| 0730105878 | THRUST WASHER | Axial load distribution |
