Overview
The ZF 4644.153.096 COUPLING is a critical driveline component engineered for the WG 180 and WG 200 transmission series. This OEM genuine part serves as the primary torque transfer interface between the engine output and the transmission input shaft, ensuring smooth power delivery under heavy-duty industrial loads. Positioned directly within the bell housing assembly, the coupling absorbs torsional vibrations and compensates for minor misalignment during operation. The SKU 4644.153.096 is precision-machined to ZF’s exacting tolerances, making it a direct replacement for worn units in WG 201 Series transmissions. Without this coupling, the transmission cannot maintain proper rotational synchronization, leading to accelerated wear on adjacent components like the 4644101160: TRANSMISSION HOUSING and the 4644301323: TRANSMISSION HOUSING.
Symptoms of Failure
- Audible clunking or knocking during gear engagement: A worn 4644.153.096 coupling creates excessive backlash, producing metallic impact noises when shifting between forward and reverse. This is often misdiagnosed as gear slipping.
- Vibration at low RPM under load: Deteriorated elastomeric elements within the coupling fail to dampen torsional oscillations, causing noticeable shuddering in the driveline during acceleration from a stop.
- Oil contamination near the bell housing: Cracks in the coupling hub allow transmission fluid to migrate past the seal, leaving visible wet spots around the joint where the 4475280043: SCREW PLUG and 4644301189: THREADED BUSH interface.
- Intermittent loss of power transfer: As the coupling splines strip, the transmission may momentarily disengage from the engine, causing sudden RPM spikes without corresponding vehicle movement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.153.096 |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter (Spline) | 45 mm (estimated) |
| Overall Length | 95 mm (estimated) |
| Material | Hardened alloy steel with nitrile rubber insert |
| Weight | 2.8 kg (estimated) |
| OEM Reference | ZF 4644.153.096 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This coupling is specifically designed for the ZF WG 180 and WG 200 transmission families, which are widely used in municipal buses, fire trucks, and heavy construction equipment. It is a direct fit for the WG 201 Series category. The part also interfaces seamlessly with the 4644101160: TRANSMISSION HOUSING and the 4644301323: TRANSMISSION HOUSING found in earlier WG 180 builds. For proper sealing, always replace the 0634306198: O-RING and 0730365067: TYPE PLATE during installation. Verify your transmission serial number against the WG 200 parts catalog to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Encloses gear train and supports shaft alignment |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 series |
| 4644301189 | THREADED BUSH | Provides threaded anchor for coupling bolts |
| 4475280043 | SCREW PLUG | Seals oil passages in the housing |
| 0634306198 | O-RING | Prevents fluid leaks at coupling interface |
| 0730365067 | TYPE PLATE | Identifies transmission model and specs |
| 4644301161 | COVER PLATE | Protects coupling from debris ingress |
| 0636100621 | HEXAGON SCREW | Secures coupling to flywheel |
| 0631610020 | SET SCREW | Locks threaded bush in position |
| 0501218540 | BREATHER | Equalizes internal pressure in housing |
