Overview
Precision alignment within ZF heavy-duty transmissions is critical for torque transfer and gear engagement. The ZF 0631.302.072 CYLINDRICAL PIN serves as a locating and positioning element, ensuring exact registration between mating housing sections in the WG100, WG130, and WG131 series. This OEM genuine part, identified by SKU 0631.302.072, is installed at key interface points to prevent lateral shift under high load. When paired with the 4699101155 HOUSING and 4699201018 HOUSING, this pin maintains the concentricity required for smooth planetary gear operation. Its hardened steel construction resists deformation, making it a cornerstone of assembly integrity.
Symptoms of Failure
- Transmission housing misalignment causing gear whine: A worn or sheared cylindrical pin allows the 4699309077 HOUSING COVER to shift, producing a high-pitched noise during acceleration.
- Recurring oil seepage at housing joints: When the pin fails to locate the 0636100132 TORX SCREW pattern correctly, gasket compression becomes uneven, leading to external leaks.
- Hard shifting or delayed engagement: Loss of pin integrity allows the valve body or clutch pack housing to drift, disrupting hydraulic circuit alignment.
- Vibration during torque converter lockup: A missing or deformed pin permits radial movement between the pump housing and main case, causing driveline shudder.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0631.302.072 |
| Type | Cylindrical Dowel Pin |
| Material | Hardened Alloy Steel (60-62 HRC) |
| Diameter (Nominal) | 12 mm |
| Length (Nominal) | 30 mm |
| Weight | ~0.027 kg |
| OEM Reference | ZF 0631.302.072 |
| Surface Finish | Ground, Chamfered Ends |
Compatibility
This cylindrical pin is engineered for ZF’s WG series powershift transmissions. It is directly compatible with the WG100, WG130, and WG131 models. Due to shared housing architecture, it may also fit WG180 and WG200 series where identical dowel locations are used. Always verify the pin bore diameter and depth against your specific housing casting. For complete assembly, consider the 0634801038 SEALING RING for joint integrity and the 0636302013 SCREW PLUG for port sealing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101155 | HOUSING | Main transmission case section |
| 4699201018 | HOUSING | Intermediate housing adapter |
| 4699309077 | HOUSING COVER | End cover with bearing support |
| 0636100132 | TORX SCREW | Fastener for housing retention |
| 0634801038 | SEALING RING | O-ring for fluid containment |
| 0636302013 | SCREW PLUG | Threaded plug for oil passages |
| 0501319149 | SCREW PLUG | Magnetic drain plug |
| 0637101790 | BREATHER | Pressure equalization valve |
| 0631302221 | CYLINDRICAL PIN | Alternative size dowel pin |
| 0730365801 | TYPE PLATE | Identification nameplate |
