Overview
The ZF 4644.151.105 COUPLING is a critical driveline component engineered specifically for the WG 180 and WG 200 transmission series. This OEM genuine part functions as the primary torque transfer interface between the engine output and the transmission input shaft, ensuring smooth power delivery under heavy load conditions. Positioned within the bell housing assembly, this coupling absorbs torsional vibrations and compensates for minor misalignment during operation. The SKU 4644.151.105 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in commercial vehicle and industrial machinery applications.
Symptoms of Failure
- Transmission shudder during acceleration: A worn 4644.151.105 coupling often causes noticeable vibration or jerking when the vehicle moves from a standstill, particularly under heavy load.
- Oil leaks near the bell housing: Deterioration of the coupling’s sealing surface can allow transmission fluid to escape, leaving puddles under the drivetrain.
- Abnormal clunking or knocking noises: As the coupling loses its structural integrity, metal-to-metal contact produces distinct sounds during gear engagement or deceleration.
- Reduced power transfer efficiency: A failing coupling may cause the transmission to slip or hesitate, leading to higher engine RPMs without proportional vehicle speed increase.
Technical Specifications
| Part Number | 4644.151.105 |
| Material | High-tensile steel with nitrile rubber damping element |
| Outer Diameter | 180 mm |
| Inner Diameter | 65 mm |
| Thickness | 45 mm |
| Weight | 2.8 kg |
| OEM Reference | ZF 4644.151.105 |
| Torque Capacity | 1,200 Nm |
Compatibility
This coupling is designed for the ZF WG 180 series and is also fully compatible with the ZF WG 200 transmission models. It fits applications in municipal trucks, construction equipment, and agricultural machinery where these transmissions are standard. For proper installation, ensure the mating surfaces on the TRANSMISSION HOUSING (4644101249) and the TRANSMISSION HOUSING (4644301402) are clean and free of debris. The coupling works in conjunction with the COVER PLATE (4644301298) to seal the assembly, and the O-RING (0634306323) must be replaced simultaneously to prevent fluid leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101249 | TRANSMISSION HOUSING | Encloses the gear train and supports the coupling |
| 4644301402 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 series |
| 4644301298 | COVER PLATE | Seals the coupling cavity and retains lubrication |
| 0634306323 | O-RING | Provides a leak-proof seal between mating surfaces |
| 0636305026 | SCREW PLUG | Closes fluid drain or fill ports in the housing |
| 4644301279 | SCREEN SHEET | Filters debris from transmission fluid flow |
| 4644301088 | SEALING CAP | Protects exposed openings from contamination |
| 4644159347 | SHIFT SYSTEM | Controls gear selection and engagement |
| 4475280036 | SCREW-IN SLEEVE | Provides threaded mounting for sensors or plugs |
| 4644306511 | GEAR SHIFT HOUSING | Encloses the shift mechanism and linkage |
