Overview
The ZF 0631.328.634 SLOTTED PIN is a precision-engineered locating and alignment component designed for the valve body and shift rail assemblies within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part ensures accurate positioning of internal hydraulic control elements, preventing unwanted axial movement that can disrupt gear engagement. The slotted design allows for secure retention via a circlip or retaining ring, maintaining critical clearances during high-torque operation. As a Springs & Fasteners category item, the SKU 0631.328.634 is a direct replacement for the original factory pin, guaranteeing proper fitment when paired with the 2095101024: TRANSMISSION HOUSING or the 2095301027: TRANSMISSION HOUSING.
Symptoms of Failure
When the ZF 0631.328.634 slotted pin fatigues or shears, transmission performance degrades rapidly. Watch for these specific failure indicators:
- Erratic gear engagement or delayed shifts – A worn pin allows the shift rail to drift, causing hesitation when selecting forward or reverse gears.
- Intermittent loss of hydraulic pressure – Misalignment from a broken pin can unseat valve body components, leading to pressure drops and clutch slip under load.
- Metallic rattling from the transmission pan – Fragments of a fractured slotted pin often fall into the sump, producing audible debris noise during operation.
- Oil leaks at housing joints – A displaced pin can distort the mating surface between the valve body and the 2095301027: TRANSMISSION HOUSING, compromising seal integrity.
Technical Specifications
| Part Number | 0631.328.634 |
| Type | Slotted Pin (Spring Steel) |
| Overall Length | 28.0 mm (estimated) |
| Outer Diameter | 8.0 mm (estimated) |
| Slot Width | 1.5 mm (estimated) |
| Material | Carbon Steel, Zinc-Plated |
| Weight | ~8 grams |
| OEM Reference | ZF 0631.328.634 |
| Hardness | HRC 40-45 |
Compatibility
This slotted pin is engineered for ZF commercial vehicle transmissions in the WG series. It is a direct fit for the following models: WG100, WG130, WG131, WG180, and WG200. It is also commonly used in off-highway variants such as the WG120 and WG150. Always verify the pin’s slot orientation when installing into the shift rail bore. For sealing the housing after pin replacement, use a new 0634304731: O-RING and a 4475280150: SCREW PLUG to prevent contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2095101024 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 2095301027 | TRANSMISSION HOUSING | Alternate housing for WG130/WG131 |
| 4475280150 | SCREW PLUG | Seals hydraulic test ports |
| 0634304731 | O-RING | Seals pin bore against oil leakage |
| 0634306328 | O-RING | Secondary seal for valve body cover |
| 2095301020 | GASKET | Housing-to-pan interface seal |
| 0636011207 | HEXAGON SCREW | M8 fastener for housing bolts |
| 0636011188 | HEXAGON SCREW | M6 fastener for valve body |
| 0730365280 | TYPE PLATE | Identification label for transmission |
| 0501337897 | SPEED SENSOR | Output shaft RPM monitoring |
