Overview
The ZF 0631.302.221 CYLINDRICAL PIN is a precision-engineered locating and alignment component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part ensures accurate positioning of internal assemblies within the gearbox housing, preventing misalignment during high-torque operations. The SKU 0631.302.221 is installed in critical joint areas where it interfaces with the 4699101155 HOUSING and the 4699201018 HOUSING to maintain structural integrity under load.
Symptoms of Failure
- Transmission housing misalignment: A worn 0631.302.221 pin can cause the housing halves to shift, leading to uneven gear wear and increased vibration during operation.
- Oil seepage at housing joints: When this cylindrical pin loses its press-fit tolerance, gaps form between the 4699309077 HOUSING COVER and the main housing, allowing transmission fluid to escape.
- Abnormal noise from gear train: A degraded pin permits micro-movement of internal components, producing a distinct clicking or knocking sound during gear changes.
- Difficulty maintaining gear engagement: Misalignment caused by a failed pin can result in intermittent gear slipping, particularly under heavy load or during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0631.302.221 |
| Type | Cylindrical Pin (Dowel Pin) |
| Material | Case-hardened steel (DIN 6325 equivalent) |
| Diameter | 10 mm (nominal) |
| Length | 30 mm |
| Weight | Approx. 18 g |
| OEM Reference | ZF 0631.302.221 |
| Surface Hardness | 58-62 HRC |
Compatibility
This cylindrical pin is specifically engineered for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It is also compatible with the WG180 and WG200 series when used in conjunction with the 0636100132 TORX SCREW for secure fastening. Always verify your transmission model number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631302072 | CYLINDRICAL PIN | Alternative pin for WG-series alignment |
| 0634801038 | SEALING RING | Prevents oil leaks at housing interfaces |
| 0636302013 | SCREW PLUG | Seals oil passages in the transmission |
| 0501319149 | SCREW PLUG | Threaded plug for pressure ports |
| 0637101790 | BREATHER | Equalizes internal pressure |
| 0730365801 | TYPE PLATE | Identification plate for transmission model |
