Overview
The ZF 0631.306.670 CYLINDRICAL PIN is a precision-engineered locating and retaining component designed for the WG100, WG130, and WG131 heavy-duty transmission series. This OEM genuine part serves as a critical alignment dowel within the shift mechanism and main shaft assembly, ensuring that adjacent components remain in precise axial and radial orientation under high torque loads. The SKU 0631.306.670 is manufactured to exact ZF tolerances, preventing unwanted movement that can lead to premature wear on surrounding assemblies. When installed alongside a 2094104412: MAIN SHAFT or a 2094304054: MAIN SHAFT, this cylindrical pin provides the foundational stability required for consistent gear engagement and smooth power delivery.
Symptoms of Failure
When the ZF 0631.306.670 cylindrical pin wears or shears, operators often notice intermittent gear slipping under load—a classic sign that the shift fork alignment has shifted. Another common symptom is difficulty engaging reverse or low gears, as the pin’s deformation prevents the shift rail from seating correctly. You may also experience abnormal metallic rattling from the transmission housing during deceleration, indicating that the pin has loosened and is allowing the 2094106010: SHIFT SYSTEM components to vibrate against each other. Finally, oil seepage around the shift tower gasket can occur when a worn pin allows the 2094206001: GEARSHIFT SHAFT to wobble, breaking the seal.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 0631.306.670 |
| Product Type | Cylindrical Pin (Dowel Pin) |
| Material | Case-hardened alloy steel (estimated 20MnCr5 equivalent) |
| Outer Diameter | 12 mm (nominal) |
| Overall Length | 30 mm |
| Hardness | HRC 58–62 (surface) |
| Weight | Approx. 0.027 kg |
| OEM Reference | ZF 0631.306.670 |
| Category | Springs & Fasteners |
Compatibility
This cylindrical pin is engineered specifically for ZF’s WG-series powershift transmissions. It is a direct fit for the WG100, WG130, and WG131 models. Based on its application in the shift rail and main shaft retention system, it is also likely compatible with the WG180 and WG200 series when used in the same mechanical interface. Always verify the pin’s diameter and length against your transmission’s service manual before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094104412 | MAIN SHAFT | Transfers torque from input to output; houses the pin bore |
| 2094304054 | MAIN SHAFT | Alternate shaft variant for WG130/WG131 assemblies |
| 2094106010 | SHIFT SYSTEM | Controls gear selection; uses pin for fork alignment |
| 2094206001 | GEARSHIFT SHAFT | Transmits shift lever motion; secured by the pin |
| 2094306053 | GEARSHIFT SHAFT | Secondary shift shaft for auxiliary range gears |
| 0630513070 | SNAP RING | Retains the pin axially in its bore |
| 2094306019 | WASHER | Provides thrust surface under the pin head |
| 0732040444 | COMPRESSION SPRING | Preloads the shift detent mechanism |
| 0732040728 | COMPRESSION SPRING | Heavier spring for high-torque shift rails |
| 2093206001 | BUSH | Guides the shift shaft; reduces pin side-load |
Frequently Asked Questions
Q: Can I reuse the ZF 0631.306.670 pin during a rebuild?
A: No. This is a single-use interference-fit component. Reusing it risks shearing and internal damage. Always install a new OEM pin with every main shaft or shift system overhaul.
Q: How do I know if the pin is the correct size for my WG130?
A: Measure the bore diameter in the shift fork and main shaft. The 0631.306.670 pin has a nominal 12 mm diameter. If your bore measures 12.05 mm or larger, you may need an oversized pin or a replacement BUSH to restore proper fit.
Q: Does this pin require lubrication during installation?
A: Yes. Apply a thin film of ZF-approved assembly grease (or equivalent lithium-based grease) to the pin’s outer surface before driving it into the bore. This prevents galling and ensures correct seating against the SNAP RING.
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