Overview
The ZF 4644.151.229 COUPLING is a critical driveline component engineered specifically for the WG 180 and WG 200 series transmissions. 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-duty industrial loads. The SKU 4644.151.229 sits directly within the bell housing assembly, where it absorbs torsional vibrations and compensates for minor misalignment during operation. As a precision-machined coupling, it maintains the exacting tolerances required for long service intervals in construction, mining, and agricultural equipment.
Symptoms of Failure
- Torque converter shudder during low-speed operation: When the coupling wears, operators often experience a pronounced vibration or shudder when accelerating from a stop, particularly under load in WG 200 series transmissions.
- Transmission fluid contamination with metallic debris: Worn coupling splines shed fine metal particles into the hydraulic circuit, visible as glitter in the fluid during routine inspection.
- Intermittent gear engagement delay: A failing coupling causes a noticeable lag between shifting and actual gear engagement, often accompanied by a dull clunk sound from the driveline.
- Oil seepage at the bell housing joint: Degraded coupling seals allow transmission fluid to weep past the housing interface, leaving visible stains on the exterior of the assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.151.229 |
| Material | High-strength alloy steel with induction-hardened splines |
| Outer Diameter | 180 mm (7.09 in) |
| Overall Length | 95 mm (3.74 in) |
| Spline Count | 14-tooth internal spline |
| Weight | 2.8 kg (6.17 lbs) |
| Operating Torque Range | Up to 2,200 Nm |
| OEM Reference | ZF 4644.151.229 |
Compatibility
This coupling is designed for direct fitment in the ZF WG 180 and ZF WG 200 transmission families, including the WG 201 Series variants. It is also compatible with select WG 180 derivatives used in off-highway vehicles from 2005 onward. The part interfaces directly with the TRANSMISSION HOUSING (4644101222) and the TRANSMISSION HOUSING (4644301226), both of which provide the structural mounting points for the coupling assembly. For proper identification, always reference the TYPE PLATE (0730365067) affixed to your transmission, and secure the coupling using the GROOVED STUD (0631311009) during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101222 | TRANSMISSION HOUSING | Encloses and supports the coupling assembly |
| 4644301226 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 series |
| 0730365067 | TYPE PLATE | Identification plate for transmission model verification |
| 0631311009 | GROOVED STUD | Fastener for coupling-to-housing attachment |
| 4644301298 | COVER PLATE | Seals the coupling access opening |
| 0634306525 | O-RING | Hydraulic seal between coupling and housing |
| 0636305026 | SCREW PLUG | Drain or fill port plug for the coupling cavity |
| 4475280078 | ADAPTER | Interface adapter for non-standard engine flywheels |
| 4644301279 | SCREEN SHEET | Filter screen protecting the coupling from debris |
| 4644301088 | SEALING CAP | Protective cap for unused coupling ports |
