Overview
The ZF 0631.329.057 SPRING PIN is a precision-engineered OEM genuine component designed for the WG100, WG130, and WG131 transmission series. This hardened steel pin serves as a critical locating and retaining element within the differential assembly, securing the 5838109006: DIFFERENTIAL components against axial movement under high torque loads. As a spring pin, it absorbs shear forces and vibration during gear engagement, ensuring the differential gears remain correctly aligned. The SKU 0631.329.057 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn or damaged pins in heavy-duty industrial transmissions.
Symptoms of Failure
- Intermittent gear slipping under load: A worn spring pin can allow the differential assembly to shift slightly, causing the 2095209037: DIFFERENTIAL gears to lose mesh engagement, resulting in power loss during acceleration.
- Metallic rattling from the differential housing: As the pin fatigues, it may loosen and create a distinct clicking or rattling noise, particularly when the transmission is under heavy torque or during deceleration.
- Premature wear on the taper roller bearing: Misalignment caused by a failing spring pin places uneven stress on the 0750117075: TAPER ROLLER BEARING, leading to overheating and accelerated bearing degradation.
- Oil contamination from metal debris: A fractured spring pin sheds fine metallic particles into the transmission fluid, which can clog filters and damage the 2095309059: DIFF.HOUSING internal surfaces.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0631.329.057 |
| Type | Slotted Spring Pin (DIN 1481) |
| Material | Hardened Spring Steel (C67S) |
| Outer Diameter | 8.0 mm |
| Length | 32.0 mm |
| Wall Thickness | 1.5 mm |
| Weight | 0.008 kg |
| OEM Reference | ZF 0631.329.057 |
| Surface Finish | Phosphate-coated |
Compatibility
This spring pin is engineered for the ZF WG100, WG130, and WG131 series of industrial transmissions. It is also compatible with select variants of the WG180 and WG200 models where the differential housing uses the same pin retention geometry. Always verify the pin bore diameter and length against your existing assembly before installation. The 0631.329.057 is not interchangeable with the shorter 0631329086: SPRING PIN used in earlier WG series units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631329086 | SPRING PIN | Alternate pin for earlier WG differentials |
| 0730300820 | THRUST WASHER | Axial load bearing surface for differential gears |
| 4482360002 | AXLE BEVEL GEAR | Torque transfer from differential to axle shaft |
| 2095309081 | DIFFERENTIAL AXLE | Cross shaft supporting bevel gears |
| 5838300811 | THRUST WASHER | Wear surface for differential side gears |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Primary gear set within differential |
