Overview
The ZF 4646.152.548 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 mechanical link between the torque converter output and the transmission input shaft, ensuring smooth power transfer and torsional vibration dampening. The SKU 4646.152.548 is a direct replacement part that maintains factory-specified tolerances for optimal drivetrain efficiency. It integrates directly with the TRANSMISSION HOUSING and the HOUSING assembly, forming a sealed unit that prevents contamination while managing hydraulic pressure distribution.
Symptoms of Failure
- Torque converter shudder during low-speed maneuvers – A worn coupling causes intermittent lock-up, producing vibration under 15 mph.
- Transmission fluid contamination with metallic debris – Friction material from the coupling wears into the oil, visible as glitter in the sump.
- Delayed engagement when shifting from Neutral to Drive – The coupling fails to transmit torque promptly, causing a 2-3 second lag.
- Whining noise at highway speeds – Bearing wear within the coupling generates a high-pitched sound that intensifies with RPM.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.152.548 |
| Outer Diameter | 248 mm |
| Inner Diameter | 85 mm |
| Overall Length | 112 mm |
| Material | Hardened 4140 steel with nitrile rubber dampener |
| Weight | 4.2 kg |
| OEM Reference | ZF 4646.152.548 |
| Torque Capacity | 1,850 Nm |
Compatibility
This coupling is engineered for ZF WG-series transmissions used in medium-duty trucks, buses, and off-highway equipment. It is directly compatible with the WG 250, WG 260, and WG 310 models. The part also fits WG 180 and WG 200 series when used with the appropriate 螺栓 and CAP SCREW kits. Always verify the spline count and pilot bore diameter against your transmission’s serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101189 | TRANSMISSION HOUSING | Encloses the gear train and supports the coupling |
| 4646301317 | HOUSING | Intermediate housing for torque converter assembly |
| 0636115293 | 螺栓 | M12 flange bolt for coupling-to-hub fastening |
| 0636101153 | CAP SCREW | M10 hex cap screw for housing attachment |
| 0736300232 | 螺栓 | M8x25 bolt for valve block mounting |
| 4475280208 | SCREW PLUG | Seals hydraulic test ports on the housing |
| 0634316523 | O-RING | Seals the coupling-to-housing interface |
| 4656306171 | VALVE BLOCK | Controls clutch pressure modulation |
| 4656306190 | CONNECTING HOUSING | Links the coupling to the main gear case |
| 0501213997 | PRESSURE REGULATOR | Maintains consistent hydraulic pressure to the coupling |
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