Overview
The ZF 0501.320.413 SCREW PLUG is a critical sealing component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part functions as a threaded closure element, typically located in the transmission housing or valve body, to seal fluid passages and prevent contamination. The SKU 0501.320.413 ensures a precise fit within the assembly, often working in conjunction with the 4108101158: HOUSING to maintain hydraulic pressure integrity. Without this screw plug, the transmission system cannot sustain proper lubrication or cooling flow.
Symptoms of Failure
- Transmission fluid seepage around the plug area – Visible oil drips or wet spots near the housing indicate a degraded seal or stripped threads on the 0501.320.413 screw plug.
- Erratic gear engagement or slipping – A loose or missing plug causes pressure loss in the hydraulic circuit, leading to delayed shifts or clutch slip during acceleration.
- Contaminated transmission fluid – If the plug fails, dirt and debris enter through the unsealed port, accelerating wear on internal components like the 0735370298: ROLLER BEARING.
- Audible whining or grinding noises – Insufficient fluid pressure from a compromised plug can starve bearings and gears, producing abnormal sounds from the transmission.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0501.320.413 |
| Type | Hexagon Socket Screw Plug |
| Thread Size | M18 x 1.5 (estimated) |
| Material | Steel, zinc-plated |
| Seal Type | Integrated copper or aluminum washer |
| Weight | Approx. 35 g |
| OEM Reference | ZF 0501.320.413 |
Compatibility
This screw plug is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It also fits select variants of the WG180 and WG200 series where the same thread pattern is used in the main housing or valve body. For proper installation, verify the plug interfaces with the 0501320268: COVER and the 0501215907: MOTOR assembly, as these components share the same fluid circuit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101158 | HOUSING | Main transmission casing that holds the screw plug |
| 0501215907 | MOTOR | Hydraulic control motor for shift actuation |
| 0501320268 | COVER | Sealing cover for the valve body access port |
| 0735370298 | ROLLER BEARING | Supports rotating shafts within the transmission |
| 0501317874 | HOUSING | Secondary housing for clutch pack assembly |
| 0501317875 | ROLLER | Guides shift fork movement |
| 0501213227 | PISTON | Hydraulic piston for clutch engagement |
| 0501317876 | COMPRESSION SPRING | Returns piston to neutral position |
| 0501314823 | BUSH | Wear-resistant liner for pivot points |
| 0501314929 | CAM DISC | Controls shift timing in the valve body |
