Overview
The ZF 4644.151.099 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 torque converter input, ensuring precise torque transfer and dampening torsional vibrations. Positioned within the bell housing assembly, the 4644.151.099 coupling interfaces directly with the TRANSMISSION HOUSING (4644101172) and the TRANSMISSION HOUSING (4644301390) to maintain concentric alignment. This SKU is a direct OEM replacement, manufactured to ZF’s original tolerances for long service life in heavy-duty applications.
Symptoms of Failure
When the ZF 4644.151.099 coupling begins to degrade, operators will notice distinct performance issues. Torque converter shudder during low-speed engagement is a primary indicator, often mistaken for transmission slipping. Metallic rattling or clunking noises from the bell housing area signal worn coupling splines or elastomeric elements. Premature wear on the SCREW PLUG (0636302005) and THREADED BUSH (4644301189) can occur due to misalignment caused by a failing coupling. Additionally, intermittent loss of power transfer under load suggests the coupling is no longer maintaining a positive mechanical connection, leading to costly downtime if not addressed promptly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.151.099 |
| Material | High-tensile alloy steel with elastomeric dampener |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter | 65 mm (estimated) |
| Overall Length | 95 mm (estimated) |
| Weight | 2.8 kg (estimated) |
| OEM Reference | ZF 4644.151.099 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This coupling is designed for the ZF WG 201 series, specifically the WG 180 and WG 200 transmission models. It is also compatible with select variants of the WG 160 and WG 210 series where the bell housing configuration matches. The 4644.151.099 replaces earlier coupling designs and is backward-compatible with most WG 180/200 units produced after 2005. Always verify the spline count and pilot bore diameter against your existing coupling before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101172 | TRANSMISSION HOUSING | Encloses and supports internal transmission components |
| 4644301390 | TRANSMISSION HOUSING | Secondary housing section for torque converter area |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for housing fasteners |
| 0636302005 | SCREW PLUG | Seals fluid passages in the housing assembly |
| 0634306198 | O-RING | Prevents fluid leaks between mating surfaces |
| 0634801098 | SEALING RING | Provides static seal at coupling interface |
| 0730365067 | TYPE PLATE | Identifies transmission model and serial number |
| 0631311009 | GROOVED STUD | Locates and secures housing alignment |
| 4644301161 | COVER PLATE | Protects coupling access opening |
| 0636100621 | HEXAGON SCREW | Fastens cover plate and housing sections |
