Overview
The ZF 0631.329.197 SPRING PIN is a precision-engineered fastener designed for the valve body and housing assemblies within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part ensures secure alignment and retention of critical internal components, preventing axial movement under high hydraulic pressure and vibration. As a core element in the Springs & Fasteners category, the SKU 0631.329.197 interfaces directly with the 4143101016 HOUSING and the 4143301039 HOUSING to maintain structural integrity during gear shifts. Without this spring pin, the transmission’s shift timing and clutch pack engagement become unreliable.
Symptoms of Failure
- Erratic gear engagement or delayed shifting – A worn or broken spring pin allows the valve body to shift out of alignment, causing hesitation or harsh engagement when selecting forward or reverse gears.
- Internal hydraulic pressure loss – When the pin fractures, it can obstruct oil passages, leading to low line pressure and eventual clutch slip under load.
- Metallic rattling noise from the transmission pan – A loose spring pin may vibrate against the 0501318136 GASKET or housing, producing a distinct tapping sound during idle or acceleration.
- Oil seepage around the valve body cover – A deformed pin can distort the sealing surface, allowing ATF to weep past the 0636101084 CAP SCREW interface.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0631.329.197 |
| Type | Spring Pin (Slotted or Coiled) |
| Material | Carbon Spring Steel (DIN 17223) |
| Nominal Diameter | 6 mm |
| Length | 28 mm |
| Weight | ~4.2 g |
| OEM Reference | ZF 0631.329.197 |
| Surface Finish | Phosphate coated |
Compatibility
This genuine ZF spring pin is engineered for the WG series of powershift transmissions. Primary applications include the WG100, WG130, and WG131 models. It may also be suitable for the WG180 and WG200 series when used in valve body retention points with matching bore diameters. Always verify the pin length against your specific transmission housing. For complete assembly, pair this pin with the 4143201019 VALVE INSERT and 0634306198 O-RING to ensure a leak-free seal.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101016 | HOUSING | Main transmission housing for valve body |
| 4143301039 | HOUSING | Secondary housing for clutch pack support |
| 0501318136 | GASKET | Seals housing joint to prevent ATF leaks |
| 0636101084 | CAP SCREW | Secures housing to transmission case |
| 0750108044 | PLUG | Closes unused hydraulic ports |
| 0636302014 | SCREW PLUG | Threaded plug for pressure test points |
| 0634801057 | SEALING RING | Copper ring for plug sealing |
| 0730365092 | TYPE PLATE | Identification plate for transmission model |
| 4143201019 | VALVE INSERT | Hydraulic valve seat for shift control |
| 0634306198 | O-RING | Seals valve insert to housing bore |
