Overview
The ZF 0631.306.085 CYLINDRICAL PIN is a precision-engineered locating component designed for the WG 65 series heavy-duty transmission. This OEM genuine part serves as a critical alignment dowel within the transmission housing assembly, ensuring accurate positioning of mating components during high-torque operation. The SKU 0631.306.085 is manufactured to ZF’s exacting tolerances to prevent axial movement and maintain gear train integrity under extreme loads. It is typically installed during transmission rebuilds or when replacing the TRANSMISSION HOUSING to guarantee proper shaft alignment.
Symptoms of Failure
- Transmission housing misalignment: A worn or sheared cylindrical pin causes the housing halves to shift, leading to uneven gear wear and increased vibration during operation.
- Oil seepage at housing joints: When the pin fails to maintain precise alignment, the HEXAGON SCREW fasteners cannot evenly compress the gasket, resulting in chronic oil leaks around the mating surfaces.
- Intermittent gear slipping under load: Loss of pin integrity allows the HEXAGON SCREW connections to loosen over time, causing momentary power loss during uphill climbs or heavy hauling.
- Abnormal metallic noise from bell housing: A deformed pin permits micro-movement between the transmission and engine adapter, creating a distinct clicking sound during gear changes.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0631.306.085 |
| Type | Cylindrical Dowel Pin |
| Material | Case-Hardened Steel (DIN 17210) |
| Outer Diameter | 12 mm (h6 tolerance) |
| Length | 45 mm |
| Surface Hardness | 58-62 HRC |
| Weight | 0.04 kg |
| OEM Reference | ZF 0631.306.085 |
Compatibility
This cylindrical pin is specifically engineered for the ZF WG 65 series transmission family, including models WG65, WG80, WG120, WG150, WG180, and WG200. It is also compatible with certain ZF Ecomat 4HP and 5HP variants that share the same housing architecture. When servicing these units, always pair the pin with new HEXAGON SCREW fasteners to maintain clamping force specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 0636011038 | HEXAGON SCREW | M10 fastener for housing bolts |
| 0636011118 | HEXAGON SCREW | M12 fastener for bell housing |
| 0636016015 | HEXAGON SCREW | M8 fastener for oil pan |
| 0634313118 | O-RING | Seals oil passage between housing sections |
| 0636304019 | SCREW PLUG | Closes drain port in housing |
| 0634801152 | SEALING RING | Copper gasket for plug threads |
| 0732611049 | FILTER INSERT | Internal oil filtration element |
| 0634303718 | O-RING | Seals filter housing cover |
| 0636015114 | HEXAGON SCREW | M6 fastener for valve body |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
