Overview
The ZF 4644.305.041 ADAPTER is a critical OEM genuine component engineered specifically for the WG 200 Series transmission family. This precision-machined adapter serves as the intermediary mounting interface between the transmission housing and the hydraulic control unit, ensuring correct alignment and fluid sealing within the drivetrain assembly. The part number 4644.305.041 is manufactured to ZF’s original factory tolerances, guaranteeing a direct bolt-on replacement without modification. When servicing a WG200 gearbox, this adapter must be inspected alongside the 4460165051: CONSOLE and the 4460368311: CONSOLE, as these components share the same mounting plane and torque specifications.
Symptoms of Failure
When the ZF 4644.305.041 adapter begins to degrade, operators typically notice these specific failure indicators:
- External oil seepage at the adapter-to-housing joint – A common sign of gasket fatigue or micro-cracking in the adapter body, often mistaken for a simple seal failure.
- Intermittent gear engagement hesitation – Worn adapter surfaces can cause misalignment of the valve body, leading to delayed shifts or “gear hunting” under load.
- Abnormal transmission noise during acceleration – A loose or distorted adapter allows vibration transfer between the control unit and the main case, producing a distinct metallic rattle.
- Fluid contamination from metal particles – Fretting corrosion on the adapter face can shed debris into the hydraulic circuit, accelerating wear on downstream components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.305.041 |
| Material | Aluminum Alloy (EN AC-42100) |
| Surface Finish | Anodized, machined sealing face |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4644.305.041 |
| Bolt Pattern | 6-hole, M10 thread |
Compatibility
This adapter is designed for the ZF WG 200 Series transmissions, including models WG180, WG200, and WG210. It is also compatible with certain Ecomat 4HP variants that share the same bellhousing pattern. For proper installation, always pair this adapter with a new 0636011429: HEXAGON SCREW and a 0730100365: WASHER to achieve the correct clamping force. The adapter interfaces directly with the 4644105418: DISCONNECTION unit and the 4460068159: AXLE DRIVE assembly in the torque path.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4460165051 | CONSOLE | Mounting bracket for control valve |
| 4460368311 | CONSOLE | Secondary support bracket |
| 0636011429 | HEXAGON SCREW | Fastener for adapter mounting |
| 0730100365 | WASHER | Load distribution washer |
| 4644105418 | DISCONNECTION | Clutch disconnection mechanism |
| 4460068159 | AXLE DRIVE | Output shaft drive assembly |
| 4460168651 | INPUT FLANGE | Input shaft coupling flange |
| 4460368318 | FLANGE | Output connection flange |
| 4460368317 | DUST PROTECTION | Sealing cover for adapter bore |
| 0636020265 | HEXAGON SCREW | Bolt for flange attachment |
