Overview
The ZF 0631.306.719 CYLINDRICAL PIN is a precision-engineered locating component designed specifically for the WG 65 series transmission. This OEM genuine part serves as a critical alignment dowel within the gearbox assembly, ensuring exact positioning between mating housing sections to maintain concentricity under high-torque loads. The SKU 0631.306.719 is manufactured to ZF’s strict tolerances, preventing axial shift that can lead to premature wear on adjacent components. In the WG65, this pin interfaces directly with the TRANSMISSION HOUSING to secure the drivetrain’s structural integrity during operation.
Symptoms of Failure
- Transmission housing misalignment: A worn or sheared 0631.306.719 pin causes the housing halves to shift, leading to uneven gear contact and audible grinding noises during acceleration.
- Recurring oil seepage at mating flanges: When the cylindrical pin loses its interference fit, the OUTPUT area may develop micro-gaps, allowing ATF to weep past seals.
- Vibration in the output flange region: Failure of this pin destabilizes the OUTPUT FLANGE mounting, producing low-frequency shuddering at highway speeds.
- Bolt loosening over time: Without proper pin alignment, the HEXAGON SCREW fasteners experience cyclic shear stress, leading to torque loss and eventual fastener fatigue.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0631.306.719 |
| Material | Case-hardened alloy steel (DIN 1.7131) |
| Diameter | 12 mm (nominal) |
| Length | 45 mm |
| Surface Hardness | 58-62 HRC |
| Weight | 0.04 kg |
| OEM Reference | ZF 0631.306.719 |
| Fit Tolerance | H7/m6 interference fit |
Compatibility
This cylindrical pin is engineered for the ZF WG 65 series, including models WG65, WG80, WG120, WG150, WG180, and WG200. It is also utilized in select off-highway and marine gearboxes that share the WG65’s housing architecture. Always verify the pin’s fitment against your transmission’s serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from gearset to driveshaft |
| 4616203017 | OUTPUT FLANGE | Connects output shaft to universal joint |
| 4616101117 | TRANSMISSION HOUSING | Encloses and supports internal gear train |
| 0636011038 | HEXAGON SCREW | Secures housing halves together |
| 0636016015 | HEXAGON SCREW | Fastens output flange to shaft |
| 0631306085 | CYLINDRICAL PIN | Alternate alignment pin for smaller WG series |
| 0634313118 | O-RING | Seals housing joint against fluid loss |
| 0732611049 | FILTER INSERT | Traps debris in hydraulic circuit |
| 0634303718 | O-RING | Seals output flange bore |
| 0636610082 | STUD | Provides threaded anchor for housing bolts |
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