Overview
The ZF 4644.151.522 COUPLING is a critical driveline component engineered specifically for the WG 180 and WG 200 transmission series. This OEM genuine part serves as the primary mechanical link between the torque converter output and the planetary gearset input, ensuring precise torque transfer and vibration dampening during heavy-duty operation. The SKU 4644.151.522 is machined from high-strength alloy steel to withstand the extreme torsional loads common in construction and agricultural machinery. When installed correctly, this coupling maintains concentric alignment between rotating assemblies, preventing premature wear on adjacent components such as the 4644101160: TRANSMISSION HOUSING and the 4644301323: TRANSMISSION HOUSING.
Symptoms of Failure
- Driveline chatter during gear engagement: A worn 4644.151.522 coupling produces metallic knocking sounds when shifting between forward and reverse, particularly under load.
- Progressive oil seepage at the bell housing: Deterioration of the coupling’s sealing surface allows transmission fluid to escape, often mistaken for a failed 0634306198: O-RING.
- Vibration at 1200-1800 RPM: Excessive radial play in the coupling causes harmonic oscillations felt through the chassis, accelerating wear on the 4644301189: THREADED BUSH.
- Intermittent power loss: Slippage at the coupling interface results in delayed torque delivery, mimicking clutch pack failure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.151.522 |
| Outer Diameter | 152 mm |
| Inner Diameter | 48 mm |
| Overall Length | 95 mm |
| Material | 42CrMo4 Alloy Steel (Heat-Treated) |
| Weight | 2.85 kg |
| Surface Finish | Black Oxide Coated |
| OEM Reference | ZF 4644.151.522 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This coupling is designed for ZF WG 180 and WG 200 series powershift transmissions, commonly found in wheel loaders, telehandlers, and industrial tractors. It directly replaces the original equipment part in the WG 201 Series category. The 4644.151.522 interfaces with the 4475280043: SCREW PLUG for oil retention and requires proper alignment with the 4644301161: COVER PLATE during reassembly. Always verify spline count and pilot bore dimensions against your transmission’s service manual before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301323 | TRANSMISSION HOUSING | Rear housing section for WG series |
| 4644301189 | THREADED BUSH | Wear insert for coupling alignment |
| 4475280043 | SCREW PLUG | Oil drain/fill port seal |
| 0634306198 | O-RING | Hydraulic seal for coupling bore |
| 0730365067 | TYPE PLATE | Identification tag for transmission |
| 4644301161 | COVER PLATE | Access cover for coupling inspection |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 0631610020 | SET SCREW | Locking screw for coupling hub |
| 0501218540 | BREATHER | Pressure equalization valve |
