Overview
The ZF 0631.302.212 CYLINDRICAL PIN is a precision-engineered locating and alignment component used within the valve body and housing assemblies of ZF WG-series transmissions. This OEM genuine part ensures accurate positioning of internal components, preventing lateral movement that could disrupt hydraulic flow or gear engagement. As a critical fastener within the Springs & Fasteners category, the SKU 0631.302.212 works in conjunction with the 4699101152: HOUSING to maintain structural integrity under high torque loads. Without this pin, the transmission’s internal clearances would shift, leading to premature wear on adjacent components.
Symptoms of Failure
- Intermittent gear slipping under load: A worn or sheared 0631.302.212 pin allows the housing to shift slightly, causing misalignment of the clutch pack and intermittent loss of drive torque.
- Hydraulic fluid seepage from housing seams: When the cylindrical pin fails, the 4699309059: HOUSING COVER loses its precise seating, creating micro-gaps that allow ATF to weep past the gasket.
- Abnormal metallic rattling during neutral-to-drive shifts: A loose pin vibrates against the housing bore, producing a distinct rattle that worsens as the transmission warms up.
- Hard shifting or delayed engagement: Misalignment caused by pin wear disrupts the alignment of the 0636101411: CAP SCREW and 0636302013: SCREW PLUG, leading to erratic hydraulic pressure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0631.302.212 |
| Material | Case-hardened alloy steel (DIN 17210) |
| Diameter (Nominal) | 12 mm (0.472 in) |
| Length (Overall) | 45 mm (1.772 in) |
| Weight | 0.040 kg (0.088 lbs) |
| OEM Reference | ZF 0631.302.212 (Genuine) |
| Hardness | HRC 58-62 (surface) |
| Surface Finish | Ground, phosphate coated |
Compatibility
This cylindrical pin is specifically engineered for the ZF WG100, WG130, and WG131 transmission series. It is also compatible with the WG180 and WG200 models where the housing bore dimensions match. The pin directly interfaces with the 4699101152: HOUSING and the 4699309059: HOUSING COVER to secure the valve body stack. For full assembly integrity, always pair this pin with the 0636101411: CAP SCREW and 0636302013: SCREW PLUG to prevent fastener loosening under vibration.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101152 | HOUSING | Main structural casing for valve body and gear train |
| 4699309059 | HOUSING COVER | Seals and protects internal components from debris |
| 0636101411 | CAP SCREW | Secures housing cover to main housing |
| 0636302013 | SCREW PLUG | Seals hydraulic passages in the valve body |
| 0750108986 | SCREW PLUG | Alternate sealing plug for pressure ports |
| 0634801038 | SEALING RING | Prevents fluid leaks at plug interfaces |
| 0769100082 | TYPE PLATE | Identification plate for transmission model |
| 0637885613 | BREATHER | Equalizes internal pressure and vents moisture |
| 4699102187 | INPUT | Input shaft assembly for torque converter |
| 4699302337 | DRIVE PINION | Transfers power from input to planetary gears |
