Overview
The ZF 4644.324.013 DRIVER is a critical OEM genuine component engineered for the WG200 and WG65 transmission series. This part functions as the primary actuation interface within the clutch pack assembly, converting hydraulic pressure into mechanical force to engage and disengage gear sets. As a precision-machined driver, it ensures smooth torque transfer and synchronized shifting under heavy-duty industrial loads. The SKU 4644.324.013 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in off-highway vehicles, construction equipment, and material handling machinery. It sits directly between the piston assembly and the clutch plates, where it must withstand high cyclic stress and thermal expansion.
Symptoms of Failure
- Delayed or harsh shifting: When the driver surface wears unevenly, hydraulic pressure cannot engage clutches smoothly, causing jerky gear changes or hesitation during acceleration.
- Intermittent gear slipping under load: A worn driver fails to maintain consistent plate pressure, leading to power loss when climbing grades or hauling heavy payloads.
- Transmission oil contamination: Cracks or pitting on the driver face can generate metallic debris that circulates through the system, often detected during routine oil analysis.
- Audible grinding or whining noise: Excessive clearance between the driver and mating components produces a distinct metallic sound during gear engagement, especially in low-range operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.324.013 |
| Material | Case-hardened alloy steel (DIN 1.7131) |
| Outer Diameter | 148.5 mm |
| Inner Diameter | 92.0 mm |
| Thickness | 22.4 mm |
| Weight | 1.85 kg |
| Surface Hardness | 58-62 HRC |
| OEM Reference | ZF 4644.324.013 |
Compatibility
This driver is specifically designed for the ZF WG200 and WG65 series transmissions, which are commonly used in mobile cranes, wheel loaders, and dump trucks. It is also compatible with the WG180 and WG120 models that share the same clutch pack architecture. For proper installation, the driver must be paired with a TRANSMISSION HOUSING (4616101065) to maintain correct alignment. Secure fastening requires HEXAGON SCREW (0636011038), HEXAGON SCREW (0636011118), and HEXAGON SCREW (0636016015) to ensure the assembly withstands vibration and torque loads. Always verify transmission serial numbers before ordering to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Encloses and supports the gear train |
| 0636011038 | HEXAGON SCREW | Secures housing to bell housing |
| 0636011118 | HEXAGON SCREW | Fastens clutch pack cover plate |
| 0636016015 | HEXAGON SCREW | Mounts valve body to housing |
| 0631306085 | CYLINDRICAL PIN | Aligns driver during assembly |
| 0634313118 | O-RING | Seals hydraulic passages |
| 0636304019 | SCREW PLUG | Closes oil gallery ports |
| 0634801152 | SEALING RING | Prevents external oil leaks |
| 0732611049 | FILTER INSERT | Captures debris from clutch wear |
| 0634303718 | O-RING | Seals piston-to-driver interface |
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