Overview
The ZF 0631.306.746 CYLINDRICAL PIN is a precision-engineered locating and alignment component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part ensures exact positioning of internal assemblies, preventing axial movement and maintaining gear mesh accuracy under heavy torque loads. As a critical fastener within the Springs & Fasteners category, the SKU 0631.306.746 is installed in the valve body and clutch pack alignment bores, where it interfaces directly with the 4108101112: HOUSING and the 4108201177: HOUSING to secure the transmission’s structural integrity.
Symptoms of Failure
- Transmission oil leaks near the housing seam: A worn or sheared cylindrical pin allows the 4108301304: BEARING COVER to shift, breaking the seal and causing fluid seepage.
- Gear slipping under load: When the pin loses its press-fit tolerance, the planetary carrier can misalign, leading to intermittent torque loss during acceleration.
- Abnormal metallic rattling from the bell housing: A loose pin creates play between the 0636302056: SCREW PLUG and the housing bore, generating a distinct chatter at idle.
- Hard shifting or delayed engagement: Misalignment caused by a deformed pin disrupts hydraulic pressure flow, resulting in harsh 1-2 upshifts.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0631.306.746 |
| Type | Cylindrical Pin (Dowel Pin) |
| Material | Case-hardened alloy steel (DIN 6325 equivalent) |
| Diameter | 8 mm (nominal) |
| Length | 30 mm |
| Surface Hardness | 58-62 HRC |
| Weight | ~12 grams |
| OEM Reference | ZF 0631.306.746 |
| Fit Tolerance | ISO m6 (interference fit) |
Compatibility
This cylindrical pin is factory-specified for the ZF WG100, WG130, and WG131 series transmissions. It is also used in the WG180 and WG200 models where identical housing bores exist. Always verify the pin’s diameter against the 4108306173: GASKET and 0750110040: SHAFT SEAL dimensions to ensure proper sealing. For WG150 variants, cross-reference with the 4108102042: INPUT shaft alignment specs.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101112 | HOUSING | Main transmission case for WG series |
| 4108201177 | HOUSING | Rear housing assembly |
| 0636302056 | SCREW PLUG | Seals hydraulic passages |
| 4108301304 | BEARING COVER | Retains output shaft bearing |
| 4108306173 | GASKET | Prevents oil leaks at housing joint |
| 0750110040 | SHAFT SEAL | Dynamic seal for rotating shafts |
| 4108102042 | INPUT | Input shaft assembly |
| 4108302099 | PLANET CARRIER | Holds planetary gears |
| 4108302007 | BEARINGSHEET | Thrust bearing shim |
| 0635332196 | BALL BEARING | Radial support for shafts |
