Overview
The ZF 0631.100.368 CYLINDRICAL PIN is a precision-machined locating element engineered for the internal gear train assemblies of ZF WG100, WG130, and WG131 transmissions. This OEM genuine part serves as a critical alignment dowel within the differential housing, ensuring that mating components such as the 2098309011: CROWN WHEEL and the 2098309010: DIFFERENTIAL HOUSING maintain exact positional tolerances under high torque loads. The SKU 0631.100.368 is often replaced during a full differential rebuild to prevent axial play that leads to premature gear wear.
Symptoms of Failure
- Intermittent gear slipping under load: A worn cylindrical pin allows the 2098109042: DIFFERENTIAL assembly to shift, causing momentary loss of drive torque during acceleration.
- Metallic grinding noise from the transmission sump: When the pin shears or deforms, the 2099209001: DIFFERENTIAL components can contact the housing, producing a distinct scraping sound.
- Oil contamination with fine steel particles: Pin fretting generates metallic debris that circulates through the lubrication system, often mistaken for bearing failure.
- Erratic shift quality in WG130/WG131 units: Misalignment caused by a degraded pin leads to binding in the planetary gearset, resulting in harsh or delayed engagement.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0631.100.368 |
| Type | Cylindrical Pin (Dowel Pin) |
| Material | Case-hardened alloy steel (DIN 1.7131) |
| Diameter | 10 mm (nominal) |
| Length | 28 mm |
| Weight | ~0.017 kg (17 g) |
| Surface Hardness | 58–62 HRC |
| OEM Reference | ZF 0631.100.368 |
| Compliance | ISO 8734 (parallel dowel pin) |
Compatibility
This cylindrical pin is specifically designed for the ZF WG100, WG130, and WG131 transmission series. It is a direct replacement for the original factory-installed pin in the differential carrier assembly. While the WG180 and WG200 models use a similar pin, the 0631.100.368 is dimensionally unique to the WG100/WG130/WG131 family. Always verify the pin length and diameter against your existing part before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2098109042 | DIFFERENTIAL | Distributes torque between axles |
| 2098309011 | CROWN WHEEL | Transfers final drive power |
| 2099209001 | DIFFERENTIAL | Rear differential assembly |
| 2098309010 | DIFFERENTIAL HOUSING | Encloses differential gears |
| 2098309009 | DIFFERENTIAL HOUSING | Alternate housing variant |
| 2098309031 | AXLE BEVEL GEAR | Drives axle shaft rotation |
| 2098309030 | AXLE BEVEL GEAR | Left-side bevel gear |
| 2098309032 | DIFFERENTIAL BEVEL GEAR | Planetary gear in differential |
| 12883200682 | THRUST WASHER | Reduces axial friction |
| 0635332059 | BALL BEARING | Supports rotating shafts |
