Overview
The ZF 4646.152.078 COUPLING is a precision-engineered OEM sub-assembly designed for the WG 250, WG 260, and WG 310 series transmissions. This critical component serves as the primary torque transfer interface between the engine flywheel and the transmission input shaft, ensuring smooth power delivery and driveline alignment. As a factory-spec replacement, the SKU 4646.152.078 directly matches original ZF manufacturing tolerances, eliminating the need for aftermarket adaptation. This coupling absorbs torsional vibrations and compensates for minor axial misalignment, protecting downstream gearsets from premature wear. It is commonly installed during a full transmission rebuild or when addressing driveline shudder issues in heavy-duty commercial vehicles.
Symptoms of Failure
- Torque converter shudder or vibration at low RPM: A worn coupling loses its damping capacity, causing noticeable driveline oscillations during acceleration from a stop.
- Oil seepage around the bell housing mating surface: Deterioration of the coupling seal leads to transmission fluid leaks, often misdiagnosed as a rear main seal failure.
- Intermittent gear engagement delay: When the coupling splines wear, rotational play develops, causing a momentary lag between throttle input and transmission response.
- Metallic rattling noise from the transmission bell housing: Loose or fractured coupling components produce a distinct chatter at idle, worsening under load.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4646.152.078 |
| Outer Diameter | 310 mm (estimated) |
| Inner Spline Diameter | 78 mm |
| Overall Length | 95 mm |
| Material | High-tensile steel with nitrile rubber damping element |
| Weight | 4.2 kg (9.3 lbs) |
| OEM Reference | ZF 4646.152.078 |
| Torque Capacity | 2,800 Nm (estimated) |
Compatibility
This coupling is engineered for the ZF WG series powershift transmissions. It is a direct fit for the WG 250, WG 260, and WG 310 series, including the WG 311 variant. It also applies to earlier WG 180 and WG 200 models when used with the appropriate adapter hardware. Always verify your transmission model tag before ordering. During installation, ensure the mating surfaces are clean and inspect the 0636115293: 螺栓 and 0736300232: 螺栓 for thread wear. The 4475280208: SCREW PLUG must be torqued to spec to prevent oil bypass, and the 0634316523: O-RING should be replaced simultaneously to guarantee a leak-free seal.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Mounting bolt for coupling flange |
| 0736300232 | 螺栓 | High-strength bolt for bell housing |
| 4475280208 | SCREW PLUG | Seals oil gallery access port |
| 0634316523 | O-RING | Seals coupling-to-shaft interface |
| 0630361026 | SEALING CAP | Protects unused hydraulic ports |
| 0501214611 | 齿轮泵 | Hydraulic pump for clutch actuation |
| 0634313945 | O形圈 | Secondary seal for pump housing |
| 0501322534 | TEMPERATURE SENSOR | Monitors transmission fluid temp |
| 0634313366 | O-RING | Seals sensor mounting bore |
| 4646130044 | ENGINE CONNECTION | Flywheel adapter plate assembly |
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