Overview
The ZF 0631.100.305 CYLINDRICAL PIN is a precision-engineered locating and alignment component designed for the valve body and housing assemblies within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part ensures exact positioning of mating surfaces, preventing lateral movement that can compromise hydraulic circuit integrity. The SKU 0631.100.305 is manufactured to strict ZF tolerances, functioning as a critical dowel pin that maintains gear train geometry and clutch pack alignment under high-torque conditions. It is typically installed alongside the 4699101113 HOUSING and 4699301201 HOUSING to secure the transmission casing structure.
Symptoms of Failure
- Erratic gear engagement and slipping: A worn or sheared 0631.100.305 pin allows the valve body to shift out of alignment, causing delayed or incomplete clutch pack engagement during acceleration.
- Transmission oil seepage at housing joints: When this cylindrical pin fails, the 4699309202 HOUSING COVER can develop micro-gaps, leading to visible oil leaks around the bell housing area.
- Abnormal metallic rattling from the transmission pan: A fractured pin can dislodge and circulate within the oil sump, producing a distinct clicking or rattling noise during gear changes.
- Increased shift shock and harshness: Misalignment caused by a degraded pin disrupts the precise spacing required for the 0636101477 CAP SCREW torque retention, resulting in jarring shifts.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 0631.100.305 |
| Product Name | CYLINDRICAL PIN (Dowel Pin) |
| Material | Case-hardened alloy steel (DIN 6325 equivalent) |
| Diameter (Nominal) | 10 mm (0.394 in) |
| Length (Nominal) | 30 mm (1.181 in) |
| Weight | Approx. 18 g (0.04 lb) |
| Surface Hardness | 60-64 HRC |
| OEM Reference | ZF 0631.100.305 |
| Category | Springs & Fasteners |
Compatibility
This cylindrical pin is engineered specifically for ZF WG-series transmissions. Based on its part number prefix and design application, the 0631.100.305 is compatible with the following models: WG100, WG130, WG131, WG180, and WG200. It is also used in select WG210 variants where the valve body mounting pattern matches the WG130 architecture. Always verify the pin diameter against your existing housing bore before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631302221 | CYLINDRICAL PIN | Alternative dowel pin for different bore depths |
| 0501319149 | SCREW PLUG | Seals oil passages in the valve body |
| 0634801038 | SEALING RING | Prevents fluid bypass at pin interfaces |
| 0637885613 | BREATHER | Equalizes internal transmission pressure |
| 0730365801 | TYPE PLATE | Identification plate for transmission model |
| 0636302013 | SCREW PLUG | Drain or fill port sealing plug |
