Overview
The ZF 4646.152.549 COUPLING is a critical OEM sub-assembly component engineered for the WG 250, WG 260, and WG 310 series transmissions. This precision-machined coupling serves as the primary torque transfer interface between the engine flywheel and the transmission input shaft, ensuring smooth power delivery and dampening torsional vibrations. As a direct OEM replacement, the SKU 4646.152.549 is manufactured to ZF’s exacting tolerances, making it essential for maintaining driveline integrity in heavy-duty industrial applications. This part sits directly within the bell housing assembly, where it must be secured using the correct 0636115293: 螺栓 and 0736300232: 螺栓 to prevent misalignment under high torque loads.
Symptoms of Failure
- Torque converter shudder or vibration at low RPM – A worn coupling causes uneven power transfer, leading to noticeable driveline shudder during acceleration from a stop.
- Transmission fluid leaks from the bell housing area – Degradation of the coupling’s sealing surface allows ATF to escape, often mistaken for a front pump seal failure.
- Metallic grinding or clunking noises during gear engagement – Excessive play in the coupling splines produces audible contact between the coupling and the input shaft.
- Erratic shift timing or gear slipping under load – A failing coupling disrupts hydraulic pressure modulation, causing delayed or harsh shifts in WG 261 and WG 311 series units.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.152.549 |
| Outer Diameter | 250 mm (estimated) |
| Inner Spline Diameter | 45 mm |
| Material | High-tensile alloy steel with nitrided surface |
| Weight | 4.2 kg (9.3 lbs) |
| OEM Reference | ZF 4646.152.549 |
| Torque Capacity | Up to 2,100 Nm |
Compatibility
This coupling is specifically designed for ZF’s WG series powershift transmissions. It is a direct fit for the WG 250, WG 260, and WG 310 series, including the sub-variants WG 261 and WG 311. It also serves as a replacement part for earlier WG 180 and WG 200 models when used with the appropriate adapter kit. Always verify spline count and pilot bore dimensions against your transmission’s serial number. During installation, ensure the 4475280208: SCREW PLUG is torqued to specification to seal the hydraulic circuit, and replace the 0634316523: O-RING to prevent contamination ingress.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Secures coupling to flywheel |
| 0736300232 | 螺栓 | Mounts bell housing to transmission |
| 4475280208 | SCREW PLUG | Seals hydraulic test port |
| 0634316523 | O-RING | Prevents fluid leakage at coupling hub |
| 0630361026 | SEALING CAP | Protects spline end during storage |
| 0501214611 | 齿轮泵 | Supplies lubrication to coupling area |
| 0634313945 | O形圈 | Seals pump-to-coupling interface |
| 0501322534 | TEMPERATURE SENSOR | Monitors coupling operating temperature |
| 0634313366 | O-RING | Seals sensor port |
| 4646130044 | ENGINE CONNECTION | Adapter plate for non-ZF engines |
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