Overview
The ZF 0631.100.451 GROOVED PIN is a precision-engineered locating and alignment component specifically designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part serves as a critical mechanical stop and positioning element within the valve body and housing assembly, ensuring that internal components remain securely indexed during high-torque operation. The SKU 0631.100.451 is manufactured to ZF’s exacting tolerances, providing a press-fit interface that prevents rotational movement of adjacent parts. When installed correctly, this grooved pin works in concert with the 4699101086: HOUSING and the 4699301223: HOUSING to maintain structural integrity under sustained load.
Symptoms of Failure
- Transmission housing misalignment causing gear engagement noise: A worn or sheared 0631.100.451 pin allows the housing to shift, producing a distinct metallic clatter during gear changes.
- Intermittent oil seepage at the pin bore interface: When the grooved pin loses its interference fit, pressurized ATF can bypass the sealing surfaces, leading to visible drips around the housing joint.
- Erratic shift timing or delayed engagement: Movement of the pin compromises the alignment of the 0636302022: SCREW PLUG and 0501319149: SCREW PLUG, disrupting hydraulic circuit timing.
- Increased vibration at the transmission bell housing: Loss of pin retention allows the housing halves to micro-move, transmitting harmonic vibrations through the driveline.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0631.100.451 |
| Material | Case-hardened alloy steel (DIN 1.7131) |
| Overall Length | 28.0 mm ±0.1 mm |
| Outer Diameter | 8.0 mm (grooved section: 7.6 mm) |
| Groove Depth | 0.4 mm |
| Weight | 11.2 grams |
| OEM Reference | ZF 0631.100.451 |
| Surface Finish | Phosphate-coated for corrosion resistance |
| Hardness | HRC 45–50 |
Compatibility
This grooved pin is engineered for the ZF WG100, WG130, and WG131 series transmissions. It is also commonly specified for rebuilds of the WG180 and WG200 models where the pin bore dimensions match. Always verify the housing part numbers—such as 4699301222: COVER and 0501323165: SHAFT SEAL—to confirm compatibility. The pin interfaces directly with the 0634801038: SEALING RING and 0634303996: O-RING to form a complete sealing assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101086 | HOUSING | Main transmission housing casting |
| 4699301223 | HOUSING | Secondary housing section |
| 0636302022 | SCREW PLUG | Hydraulic port sealing plug |
| 0501319149 | SCREW PLUG | Oil passage closure plug |
| 0634801038 | SEALING RING | Static seal for housing joints |
| 0730365801 | TYPE PLATE | Identification plate for transmission model |
| 0501323165 | SHAFT SEAL | Dynamic seal for rotating shafts |
| 4699301222 | COVER | Access cover for valve body |
| 0634303996 | O-RING | Elastomeric seal for fluid ports |
| 0630513060 | SNAP RING | Retaining ring for shaft assemblies |
