Overview
The ZF 0631.329.087 SPRING PIN is a precision-engineered fastening component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part functions as a critical alignment and retention pin within the valve body and housing assembly, ensuring that adjacent components remain securely positioned under high vibration and thermal cycling. The SKU 0631.329.087 is manufactured to exact ZF tolerances, providing a press-fit solution that prevents axial movement of mating parts. When installed alongside the 4143101025 HOUSING or the 4143301055 HOUSING, this spring pin guarantees proper alignment of internal hydraulic circuits.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: A worn or sheared spring pin can allow the valve body to shift out of alignment, causing intermittent hydraulic pressure loss and rough gear changes.
- Internal transmission oil leaks: When the pin fails, the 4143298040 CASE may develop micro-cracks at the pin bore, leading to fluid seepage around the housing interface.
- Metallic rattling noise from the transmission pan: A broken spring pin fragment can fall into the sump, creating audible debris noise during operation and potentially damaging the pump.
- Intermittent neutral condition: Loss of pin retention in the shift rail assembly can cause the transmission to momentarily drop out of gear under load.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0631.329.087 |
| Type | Spring Pin (Slotted) |
| Material | Carbon Spring Steel (C67S) |
| Surface Treatment | Phosphate & Oil |
| Nominal Diameter | 6.0 mm |
| Free Length | 28.0 mm |
| Shear Strength | ≥ 1,200 N |
| Weight | Approx. 4.5 g |
| OEM Reference | ZF 0631.329.087 |
| Related Part | 0631329135 SPRING PIN (alternate size) |
Compatibility
This spring pin is specifically engineered for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It is also compatible with certain variants of the WG180 and WG200 series where the valve body uses a 6.0 mm slotted pin for housing retention. Always verify the pin bore diameter and depth in your specific transmission assembly before installation. For related sealing and fastening needs, consider the 0501337904 SPEED SENSOR or the 0636101024 CAP SCREW which are commonly replaced during the same service interval.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101025 | HOUSING | Main transmission housing for WG series |
| 4143301055 | HOUSING | Rear housing adapter plate |
| 4143298040 | CASE | Transmission case assembly |
| 0631329135 | SPRING PIN | Alternate spring pin for larger bores |
| 0501337904 | SPEED SENSOR | Output speed monitoring sensor |
| 0636101024 | CAP SCREW | Hex head cap screw for housing |
| 4475280099 | SCREW PLUG | M18x1.5 sealing plug |
| 0634303266 | O-RING | Hydraulic seal for valve body |
| 0501200072 | VENT VALVE | Pressure relief vent valve |
| 4475280015 | SCREW PLUG | M22x1.5 sealing plug |
