Overview
The ZF 0631.306.805 CYLINDRICAL PIN is a precision-engineered locating and alignment component designed for the internal gear train assemblies of ZF WG100, WG130, and WG131 transmissions. This OEM genuine part functions as a critical positioning dowel within the planetary carrier and differential housing, ensuring exact axial alignment of rotating assemblies under high torque loads. The SKU 0631.306.805 is manufactured to ZF’s original tolerances, providing a secure interference fit that prevents lateral movement of adjacent gears and bearings during operation. When installed alongside a 5838109012: DIFFERENTIAL, this pin maintains the precise spacing required for smooth power transfer through the drivetrain.
Symptoms of Failure
- Transmission whining noise during acceleration: A worn or sheared cylindrical pin allows the differential assembly to shift slightly, causing gear teeth to misalign and produce a high-pitched whine under load.
- Intermittent gear slipping in WG100/WG130 units: When the pin loses its interference fit, the 0750117075: TAPER ROLLER BEARING can migrate from its seated position, leading to unpredictable torque delivery.
- Metal debris in transmission fluid: A fractured cylindrical pin sheds hardened steel particles into the oil circuit, contaminating valve bodies and clutch packs.
- Excessive backlash in the final drive: Loss of pin integrity permits the 2093209023: DIFFERENTIAL to rotate out of specification, creating a noticeable clunk when shifting between drive and reverse.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 0631.306.805 |
| Type | Cylindrical Pin (Dowel Pin) |
| Material | Hardened Alloy Steel (Case-Hardened) |
| Diameter | 12 mm (nominal) |
| Length | 45 mm |
| Surface Hardness | 58–62 HRC |
| Weight | Approx. 0.04 kg |
| OEM Reference | ZF 0631.306.805 |
| Compatible Housing | 5838300626: DIFFERENTIAL HOUSING |
Compatibility
This cylindrical pin is engineered specifically for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It is also applicable to certain WG180 and WG200 variants where the differential carrier uses a 12 mm dowel pin for alignment. The part interfaces directly with the differential housing bore and should be replaced whenever the 5838300626: DIFFERENTIAL HOUSING is serviced. Always verify fitment against your transmission’s serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631329088 | SPRING PIN | Secondary retention pin for planetary carrier |
| 5838300811 | THRUST WASHER | Axial load bearing surface for differential gears |
| 5838300721 | AXLE BEVEL GEAR | Torque transfer from differential to axle shafts |
| 5838300633 | AXLE | Output shaft connecting differential to wheel hub |
| 5838300753 | THRUST WASHER | Wear surface for axle bevel gear |
| 5838300818 | THRUST WASHER | Differential spider gear thrust management |
Frequently Asked Questions
Q: Can I reuse the 0631.306.805 pin if it appears undamaged?
No. ZF cylindrical pins are single-use interference-fit components. Removal compromises the surface finish and hardness, making reuse unsafe. Always install a new OEM pin during differential or housing service.
Q: Will a worn pin cause damage to the taper roller bearing?
Yes. A loose pin allows the differential to shift, which misaligns the 0750117075: TAPER ROLLER BEARING, leading to uneven roller loading and premature bearing failure.
Q: Is this pin compatible with aftermarket differential housings?
The pin is dimensionally standard, but we recommend using it only with genuine ZF housings or the 5838300626: DIFFERENTIAL HOUSING to guarantee bore tolerance and press-fit integrity.
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Phone: +86 158 2286 3467 |
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