Overview
The ZF 4644.151.513 COUPLING is a critical driveline component engineered specifically for the WG 180 and WG 200 series transmissions. This OEM genuine part serves as the mechanical link between the engine output and the transmission input shaft, absorbing torsional vibrations and ensuring smooth power transfer under heavy loads. The SKU 4644.151.513 is precision-machined to maintain exact alignment within the bell housing assembly, directly interfacing with the TRANSMISSION HOUSING (4644101164) to prevent axial misalignment. When paired with the TRANSMISSION HOUSING (4644301371), this coupling ensures that rotational energy is transmitted without excessive backlash, extending the service life of downstream planetary gear sets.
Symptoms of Failure
- Torque converter shudder at low RPM — A worn 4644.151.513 coupling causes noticeable vibration during acceleration from a stop, often misdiagnosed as a failing torque converter.
- Metallic rattling from bell housing area — Loose or fatigued coupling teeth produce a distinct chatter, especially when shifting between forward and reverse gears.
- Premature transmission oil contamination — As the coupling wears, metal particles shed into the fluid, bypassing the filter and damaging valve bodies.
- Intermittent gear engagement failure — The coupling’s inability to maintain concentric rotation leads to delayed or harsh clutch pack engagement in WG 200 units.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.151.513 |
| Outer Diameter | 180 mm (estimated) |
| Inner Spline Diameter | 45 mm |
| Material | Heat-treated alloy steel (42CrMo4) |
| Weight | 2.8 kg |
| OEM Reference | ZF 4644.151.513 |
| Torque Capacity | 1,200 Nm (max) |
Compatibility
This coupling is designed for ZF WG 180 and WG 200 series transmissions used in medium-duty trucks, buses, and construction equipment. It directly replaces the original coupling in models with serial numbers starting from 2005 onward. The 4644.151.513 is also compatible with earlier WG 180 variants when used alongside the TYPE PLATE (0730365067) for proper identification. For installations requiring additional fastening security, the GROOVED STUD (0631311009) is recommended to anchor the coupling to the flywheel adapter.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101164 | TRANSMISSION HOUSING | Encloses gear train and supports input shaft |
| 4644301371 | TRANSMISSION HOUSING | Alternate housing for WG 200 variants |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Secures coupling to flywheel adapter |
| 4644303060 | COVER PLATE | Seals access port on housing |
| 4644201011 | COVER PLATE | Protects coupling inspection opening |
| 4644201010 | COVER PLATE | Lower housing cover for oil pan |
| 4644301372 | COVER PLATE | Rear housing cover plate |
| 0636610028 | STUD | Mounting stud for coupling assembly |
| 0634306525 | O-RING | Seals coupling-to-housing interface |
