Overview
The ZF 0636.301.500 SCREW PLUG is a critical sealing component designed for use in the WG100, WG130, and WG131 transmission series. This OEM genuine part ensures a leak-proof seal within the transmission housing, preventing fluid loss and contamination ingress. Positioned in the lower valve body or sump area, the screw plug (SKU: 0636.301.500) secures access ports for maintenance while maintaining hydraulic pressure integrity. When installed alongside the 4108101140 HOUSING, it forms a robust barrier against debris and thermal expansion stresses.
Symptoms of Failure
- Oil seepage around the transmission pan: A worn or cross-threaded 0636.301.500 screw plug often causes slow, persistent fluid drips, especially after thermal cycling.
- Erratic gear engagement: Loss of hydraulic pressure from a leaking plug can lead to delayed or harsh shifts, mimicking solenoid failure.
- Contaminated transmission fluid: A compromised seal allows dirt and moisture to enter, accelerating wear on internal components like the 0501211694 MOTOR.
- Visible corrosion or thread damage: Rust or stripped threads on the plug surface indicate imminent failure, often requiring replacement of the 0501314793 COVER as well.
Technical Specifications
| Specification | Details |
|---|---|
| Part Number | 0636.301.500 |
| Material | Steel with zinc-plated coating |
| Thread Size | M18 x 1.5 |
| Head Type | Hex socket (8mm) |
| Sealing Method | Integrated O-ring (NBR) |
| Weight | 0.04 kg |
| OEM Reference | ZF 0636.301.500 |
Compatibility
This screw plug is engineered for the following ZF transmission models: WG100, WG130, and WG131. It is also compatible with select WG180 and WG200 variants when used in conjunction with the 0501314799 BUSH for proper alignment. Always verify thread pitch and sealing surface condition on the mating 0501317874 HOUSING before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101140 | HOUSING | Main structural casing for valve body assembly |
| 0501211694 | MOTOR | Electric actuator for clutch pressure control |
| 0501314793 | COVER | Protective shield for solenoid pack |
| 0501314799 | BUSH | Wear-resistant guide for shift fork |
| 0735370299 | TAPERED ROLLER BEARING | Supports planetary gearset axial loads |
| 0501317874 | HOUSING | Secondary housing for oil pump assembly |
| 0501317875 | ROLLER | Needle bearing for torque converter hub |
| 0501209497 | PISTON | Hydraulic actuator for clutch pack |
| 0501317876 | COMPRESSION SPRING | Returns piston to neutral position |
| 0501314823 | BUSH | Guide bushing for output shaft |
