Overview
The ZF 4644.151.224 COUPLING is a critical torque-transfer component engineered specifically for the WG 180 and WG 200 transmission series. This OEM genuine part serves as the mechanical link between the engine output and the transmission input shaft, ensuring smooth power delivery and vibration dampening during heavy-duty operations. The SKU 4644.151.224 is precision-machined to maintain exact alignment within the drivetrain assembly, reducing stress on adjacent components such as the 4644101142: TRANSMISSION HOUSING and the 4644301301: HOUSING. Without this coupling, the transmission cannot properly engage with the power source, making it a non-negotiable element for operational reliability.
Symptoms of Failure
- Torque fluctuation during acceleration – A worn 4644.151.224 coupling often causes uneven power transfer, leading to jerking or hesitation when the vehicle or machinery attempts to move from a standstill.
- Metallic rattling or clunking noises – As the coupling loses its structural integrity, you may hear distinct knocking sounds from the bell housing area, particularly during gear changes or load shifts.
- Visible oil seepage near the flywheel housing – Degraded seals within the coupling assembly can allow transmission fluid to escape, leaving wet spots around the joint between the engine and the TRANSMISSION HOUSING.
- Increased drivetrain vibration – A failing coupling fails to dampen torsional vibrations, transmitting harshness through the chassis and accelerating wear on the 0631311009: GROOVED STUD and other mounting hardware.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4644.151.224 |
| Material | High-strength alloy steel with nitrided surface |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter | 65 mm (estimated) |
| Overall Length | 95 mm (estimated) |
| Weight | 3.2 kg (estimated) |
| OEM Reference | ZF 4644.151.224 |
| Torque Capacity | Up to 2,500 Nm (estimated) |
Compatibility
This coupling is designed for the ZF WG 180 and WG 200 transmission families, which are widely used in municipal buses, fire trucks, and heavy construction vehicles. It directly interfaces with the HOUSING assembly and is secured using the GROOVED STUD. For proper identification, always cross-reference the 0730365067: TYPE PLATE on your transmission to confirm model year and revision level. While primarily intended for WG 180 and WG 200, this part may also fit select WG 150 variants with adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101142 | TRANSMISSION HOUSING | Encloses and supports gear sets and shafts |
| 4644301301 | HOUSING | Provides structural mount for coupling and clutch |
| 0730365067 | TYPE PLATE | Identifies transmission model and serial number |
| 0631311009 | GROOVED STUD | Secures coupling to flywheel or adapter plate |
| 4644303060 | COVER PLATE | Seals access opening on housing |
| 4644303061 | COVER PLATE | Alternate cover plate for different housing variants |
| 4475280078 | ADAPTER | Converts coupling fitment for non-standard engines |
| 4644106306 | SHIFT SYSTEM | Controls gear selection and engagement |
| 4644306499 | COVER PLATE | Protects shift mechanism from debris |
| 4644159351 | SHIFT SYSTEM | Alternative shift system for WG 200 models |
