Overview
The ZF 4644.311.189 DRIVER is a critical rotational component engineered specifically for the WG 200 Series powershift transmission. Positioned within the clutch pack assembly, this OEM genuine part transmits torque from the input shaft to the planetary gearset, ensuring precise engagement and disengagement of drive ratios. As a high-wear interface element, the 4644.311.189 DRIVER directly influences shift quality and overall transmission efficiency. This genuine ZF part, identified by SKU 4644.311.189, is manufactured to exacting tolerances to maintain hydraulic balance and mechanical integrity under heavy-duty industrial loads.
Symptoms of Failure
- Delayed or harsh gear engagement: When the 4644.311.189 DRIVER wears, the clutch pack fails to engage smoothly, causing noticeable hesitation or jarring shifts during acceleration.
- Intermittent gear slipping under load: A worn driver surface reduces clamping force, leading to momentary power loss when the transmission is under heavy torque demand.
- Metallic debris in transmission fluid: Friction material from the driver can contaminate the hydraulic circuit, often detected during routine oil changes or filter inspections.
- Erratic shift timing: The transmission may shift too early or too late as the worn driver alters hydraulic pressure feedback within the valve body.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.311.189 |
| Product Type | Clutch Driver / Hub |
| Material | Case-hardened alloy steel |
| Outer Diameter | 185 mm (approx.) |
| Inner Diameter | 95 mm (approx.) |
| Height | 42 mm (approx.) |
| Weight | 1.8 kg (approx.) |
| Surface Treatment | Phosphate coating for corrosion resistance |
| OEM Reference | ZF 4644.311.189 |
Compatibility
This genuine ZF 4644.311.189 DRIVER is primarily designed for the WG 200 Series transmission family. Based on its clutch driver configuration, it is also compatible with the WG 180 and WG 211 models used in construction and agricultural machinery. For proper installation, this driver works in conjunction with the 4644105413 DISCONNECTION mechanism, which controls hydraulic flow to the clutch pack. The assembly is secured using the 0636021010 HEXAGON SCREW and mounts directly onto the 4644101040 TRANSMISSION HOUSING. The 4642303093 OUTPUT FLANGE transmits power from the driver to the driveline.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105413 | DISCONNECTION | Hydraulic clutch disengagement valve |
| 4642303093 | OUTPUT FLANGE | Power take-off connection point |
| 0636021010 | HEXAGON SCREW | Fastener for clutch assembly |
| 4644101040 | TRANSMISSION HOUSING | Main structural casing |
| 4644301197 | TRANSMISSION HOUSING | Alternate housing variant |
| 0730365067 | TYPE PLATE | Identification label |
| 0631311009 | GROOVED STUD | Alignment dowel for housing |
| 0636015073 | HEXAGON SCREW | Mounting bolt for flanges |
| 0634801250 | SEALING RING | Hydraulic pressure seal |
| 0636305026 | SCREW PLUG | Oil gallery closure |
