Overview
The ZF 0501.319.149 SCREW PLUG is a precision-engineered sealing component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part functions as a threaded closure within the transmission housing, preventing fluid leakage and maintaining internal pressure integrity. The SKU 0501.319.149 is installed directly into the 4699101079 HOUSING, where it secures the oil gallery access points. Its robust construction ensures a reliable seal against high-pressure transmission fluid, making it essential for long-term drivetrain reliability.
Symptoms of Failure
- Transmission fluid seepage around the plug: When the 0501.319.149 screw plug wears or its threads degrade, you may notice oil droplets forming near the housing access points, often leading to “ZF transmission oil leak at screw plug” issues.
- Pressure loss causing erratic shifting: A compromised seal can result in internal pressure drops, triggering “WG100 gearbox slipping under load” symptoms during acceleration or hill climbs.
- Contamination ingress: A failing plug allows dirt and moisture to enter the transmission, accelerating wear on internal components like the 4699302299 DRIVE PINION and 4699103064 OUTPUT shaft.
- Audible whining from the transmission: Reduced lubrication due to fluid loss can cause metal-on-metal contact, producing a high-pitched noise that worsens over time.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0501.319.149 |
| Material | Case-hardened steel with zinc-nickel plating |
| Thread Size | M18 x 1.5 (metric fine) |
| Overall Length | 22 mm |
| Hex Size | 17 mm (AF) |
| Weight | 0.035 kg |
| OEM Reference | ZF 0501.319.149 |
| Sealing Method | Integrated copper washer (replaceable) |
Compatibility
This screw plug is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It is also compatible with the WG180 and WG200 series when used in oil drain or fill port applications. For proper installation, always pair the plug with a new 0634306309 O-RING to ensure a leak-free seal. The plug works in conjunction with the 0501329881 HOUSING COVER and the 0637885612 BREATHER to maintain optimal transmission ventilation and fluid containment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101079 | HOUSING | Main transmission casing |
| 0501329881 | HOUSING COVER | Seals the housing top |
| 0634306309 | O-RING | Provides secondary seal |
| 0637885612 | BREATHER | Equalizes internal pressure |
| 0636302022 | SCREW PLUG | Alternate plug variant |
| 0634801038 | SEALING RING | Prevents thread leaks |
| 0730365801 | TYPE PLATE | Identification label |
| 4699102158 | INPUT | Power input shaft |
| 4699302299 | DRIVE PINION | Initial gear reduction |
| 4699103064 | OUTPUT | Final drive shaft |
