Overview
The ZF 0631.306.059 CYLINDRICAL PIN is a precision-machined locating and alignment component engineered for the internal gear train assemblies of ZF WG-series transmissions. This OEM genuine part (SKU: 0631.306.059) serves as a critical pivot and positioning element within the planetary gear sets, ensuring that adjacent gears and shafts maintain exact axial alignment under high-torque loads. By securing the relative position of rotating elements, this cylindrical pin prevents unwanted lateral movement that could lead to uneven gear wear or mechanical binding. It is commonly found in the differential housing area, where it works in concert with the 2093109024: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING to maintain stable gear mesh geometry.
Symptoms of Failure
- Transmission gear slippage under load: A worn or sheared cylindrical pin allows the gear cluster to shift out of alignment, causing intermittent power loss and gear disengagement during acceleration.
- Abnormal metallic grinding noise from the differential area: When the pin loses its dimensional integrity, the 2093209095: DIFFERENTIAL components may contact the housing, producing a distinct grinding sound that worsens with speed.
- Oil contamination with fine metallic particles: As the pin wears against its mating bore, steel debris enters the transmission fluid, often visible during routine oil changes as silver or dark flecks.
- Vibration in the driveline during gear changes: Misalignment caused by a failing pin introduces backlash that translates into noticeable shuddering or shaking when shifting between forward gears.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0631.306.059 |
| Product Type | Cylindrical Pin (Spring & Fastener) |
| Material | Case-hardened alloy steel (DIN 1.7131) |
| Outer Diameter | 12.0 mm (0.472 in) |
| Length | 45.0 mm (1.772 in) |
| Hardness | HRC 58-62 (core) |
| Weight | 0.040 kg (0.088 lbs) |
| OEM Reference | ZF 0631.306.059 |
Compatibility
This cylindrical pin is designed for the ZF WG100, WG130, and WG131 transmission series. It is also compatible with the WG180 and WG200 models where the differential housing assembly uses the same pin bore pattern. The part directly interfaces with the 2093309071: DIFF.HOUSING to secure the differential carrier assembly. For accurate fitment, always verify the housing bore diameter and pin length against your specific transmission serial number.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109024 | DIFFERENTIAL | Distributes torque between axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on rotating shafts |
| 2093209095 | DIFFERENTIAL | Secondary differential unit for multi-axle drives |
| 2093309071 | DIFF.HOUSING | Encloses and supports differential gears |
| 0631100223 | SPRING PIN | Retains cylindrical pin in bore |
| 0730300820 | THRUST WASHER | Reduces axial friction between gears |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to wheel hubs |
| 5838300811 | THRUST WASHER | Provides wear surface for bevel gear thrust |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Allows speed difference between wheels |
Frequently Asked Questions
Q: Can I reuse the old cylindrical pin if it looks undamaged?
A: No. Even if the pin appears intact, micro-fractures or surface wear can develop under load. ZF recommends replacing the 0631.306.059 pin whenever the differential housing is disassembled to prevent premature failure.
Q: What torque should I apply to the retaining spring pin for this cylindrical pin?
A: The spring pin (part 0631100223) should be driven flush with the housing face using a drift punch. No torque value applies—ensure the pin is fully seated without deformation.
Q: Does this pin fit the ZF WG180 transmission?
A: Yes, the 0631.306.059 cylindrical pin is compatible with WG180 models that use the same differential housing casting as the WG130 series. Always cross-reference your housing part number with the 2093309071: DIFF.HOUSING to confirm fitment.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
