Overview
The ZF 0631.306.155 CYLINDRICAL PIN is a precision-engineered locating and alignment component designed for the planetary gearset and differential carrier assemblies in heavy-duty ZF transmissions. This OEM genuine part, referenced by SKU 0631.306.155, serves as a critical fastener within the Springs & Fasteners category, ensuring that internal shafts and gears remain correctly indexed under high torque loads. It is specifically manufactured to fit the WG100, WG130, and WG131 transmission series, where it secures the 5838109012: DIFFERENTIAL assembly in its precise axial position. Without this cylindrical pin, the entire drivetrain alignment can shift, leading to accelerated wear on surrounding components.
Symptoms of Failure
- Intermittent gear slipping under load: A worn or sheared 0631.306.155 pin allows the differential carrier to shift, causing the 0750117075: TAPER ROLLER BEARING to lose preload, resulting in momentary power loss during acceleration.
- Metallic rattling from the transmission housing: When the cylindrical pin fatigues, the 2093209023: DIFFERENTIAL can vibrate against the housing, producing a distinct knocking sound at low RPM.
- Oil contamination with metallic debris: A fractured pin generates steel particles that circulate through the lubricant, often visible as glitter in the oil filter or drain plug magnet.
- Difficult or imprecise gear engagement: Misalignment caused by a failing pin forces the 5838300626: DIFFERENTIAL HOUSING to bind, making shifts feel notchy or requiring excessive force.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 0631.306.155 |
| Type | Cylindrical Pin (Spring & Fastener) |
| Material | Case-hardened alloy steel (DIN 6325 equivalent) |
| Diameter | 12 mm (nominal) |
| Length | 45 mm |
| Weight | 0.04 kg (approx.) |
| OEM Reference | ZF 0631.306.155 |
| Hardness | HRC 58-62 (core) |
Compatibility
This cylindrical pin is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It is also compatible with the WG180 and WG200 series when used in the differential carrier pinion shaft location. Always verify the pin bore diameter in your specific transmission variant before installation. For related fasteners in the same assembly, consider the 0631329088: SPRING PIN which serves a similar retention role in adjacent planetary carriers.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between output shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on the differential |
| 2093209023 | DIFFERENTIAL | Secondary differential for multi-axle applications |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and supports differential gears |
| 0631329088 | SPRING PIN | Retains planetary gear shafts |
| 5838300811 | THRUST WASHER | Reduces axial friction in differential |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Drives wheel hubs |
| 5838300753 | THRUST WASHER | Controls side gear clearance |
| 5838300818 | THRUST WASHER | Adjusts pinion gear endplay |
Frequently Asked Questions
Q: Can I reuse the 0631.306.155 pin after disassembly?
A: No. This cylindrical pin is a single-use fastener designed to deform slightly during installation. Reusing it risks shearing under load. Always replace with a new OEM pin.
Q: How do I know if my WG130 needs this pin replaced?
A: Measure the pin bore clearance. If the pin shows visible wear marks or if the differential assembly has more than 0.1 mm of lateral play, replace the pin immediately to prevent damage to the 5838300811: THRUST WASHER.
Q: Is this pin compatible with ZF WG180 transmissions?
A: Yes, the 0631.306.155 pin fits WG180 models when used in the differential carrier pin location, though always cross-reference your transmission serial number with the OEM parts catalog.
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