Overview
The ZF 4646.151.485 COUPLING is a precision-engineered OEM sub-assembly designed to connect the torque converter to the transmission input shaft in ZF’s WG 250, WG 260, and WG 310 series. This coupling absorbs torsional vibrations and ensures smooth power transfer from the engine to the gearbox, reducing drivetrain stress. As a critical driveline component, the SKU 4646.151.485 sits directly between the flexplate and the pump impeller, making it essential for maintaining alignment and load distribution. When replacing this coupling, always inspect the mating 0636115293: 螺栓 and 0736300232: 螺栓 for thread wear, as these fasteners secure the assembly to the flywheel.
Symptoms of Failure
- Transmission shudder during acceleration — A worn coupling causes intermittent slip, leading to a noticeable vibration when shifting from 1st to 2nd gear.
- Oil leaks near the bell housing — Cracks in the coupling hub allow ATF to escape, often mistaken for a front seal failure.
- Metallic rattling at idle — Loose or fatigued coupling teeth produce a distinct clatter that intensifies with engine RPM.
- Delayed engagement from Park to Drive — Excessive clearance in the coupling splines prevents immediate torque transfer, creating a lag of 2–3 seconds.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.151.485 |
| Outer Diameter | 310 mm (12.2 in) |
| Inner Spline Count | 36 teeth |
| Material | Forged steel with nitrided surface |
| Weight | 4.8 kg (10.6 lbs) |
| OEM Reference | ZF 4646.151.485 |
| Torque Capacity | 2,500 Nm (1,844 ft-lbs) |
Compatibility
This coupling is engineered for ZF WG series transmissions, specifically the WG 180, WG 200, WG 250, WG 260, and WG 310 models. It also fits the WG 261 and WG 311 series as a direct OEM replacement. For proper installation, pair this coupling with a new 4475280208: SCREW PLUG to seal the hydraulic circuit, and replace the 0634316523: O-RING to prevent fluid bypass. The coupling is not backward-compatible with WG 120 or WG 150 series due to spline pitch differences.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Secures coupling to flywheel |
| 0736300232 | 螺栓 | Mounts coupling hub to input shaft |
| 4475280208 | SCREW PLUG | Seals hydraulic test port |
| 0634316523 | O-RING | Prevents oil leakage at coupling joint |
| 0630361026 | SEALING CAP | Protects coupling splines during storage |
| 0501214611 | 齿轮泵 | Supplies hydraulic pressure to coupling |
| 0634313945 | O形圈 | Seals pump-to-coupling interface |
| 0501322534 | TEMPERATURE SENSOR | Monitors coupling operating temperature |
| 0634313366 | O-RING | Seals sensor port on coupling housing |
| 4646130044 | ENGINE CONNECTION | Adapter plate between coupling and engine |
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