Overview
The ZF 4644.153.105 COUPLING is a critical OEM genuine component engineered for the WG 180 and WG 200 series transmissions. This precision-machined coupling serves as the primary torque-transfer interface between the engine flywheel and the transmission input shaft, ensuring smooth power delivery and driveline alignment. Designed to absorb torsional vibrations and dampen shock loads, the SKU 4644.153.105 sits directly within the bell housing assembly, connecting the output of the disconnection unit to the main gear train. When paired with a properly torqued 0636021036: HEXAGON SCREW, this coupling maintains concentricity under heavy industrial loads, preventing premature wear on adjacent components like the 4644101224: TRANSMISSION HOUSING.
Symptoms of Failure
When the ZF 4644.153.105 coupling begins to degrade, operators will notice distinct operational issues. 1. Driveline shudder during acceleration — a pronounced vibration felt through the chassis when engaging gears, often misdiagnosed as clutch slip. 2. Metallic rattling at idle — caused by excessive clearance between the coupling splines and the 4644303538: OUTPUT FLANGE. 3. Intermittent loss of torque — the transmission may momentarily disengage under load, particularly in WG 200 series units operating at maximum GVWR. 4. Visible fretting wear on the coupling face — fine metallic debris in the transmission fluid indicates the coupling is grinding against the 4644105424: DISCONNECTION assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.153.105 |
| Material | High-tensile alloy steel, nitrided |
| Outer Diameter | 195 mm |
| Inner Spline Diameter | 45 mm (12-tooth involute) |
| Overall Length | 82 mm |
| Weight | 3.2 kg (7.1 lbs) |
| Torque Capacity | 1,450 Nm (peak) |
| OEM Reference | ZF 4644.153.105 (Genuine) |
| Hardware Required | 0636021036: HEXAGON SCREW (x4) |
Compatibility
This coupling is specifically designed for the ZF WG 180 and ZF WG 200 series transmissions. It is a direct replacement for units manufactured between 2008 and 2023, including the WG 180-6, WG 200-8, and WG 200-10 variants. The part interfaces directly with the 4644105424: DISCONNECTION mechanism and requires a compatible 4644303538: OUTPUT FLANGE for proper installation. Always verify that your transmission housing casting number matches the 4644101224: TRANSMISSION HOUSING profile before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105424 | DISCONNECTION | Engages/disengages engine power to coupling |
| 4644303538 | OUTPUT FLANGE | Transfers torque from coupling to driveshaft |
| 0636021036 | HEXAGON SCREW | Secures coupling to flywheel adapter |
| 4644101224 | TRANSMISSION HOUSING | Encloses coupling and gear train |
| 4644301346 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 4644106300 | SHIFT SYSTEM | Controls gear selection and coupling engagement |
| 4644306500 | COVER PLATE | Seals coupling access port on housing |
| 4644159311 | SHIFT SYSTEM | Secondary shift actuator for WG 200 series |
| 4644306563 | VALVE BLOCK | Hydraulic control for coupling dampening |
