Overview
The ZF 4644.303.409 OUTPUT FLANGE is a critical driveline component engineered specifically for the WG 200 series transmission family. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the propeller shaft or drive axle, transmitting torque from the gearbox to the vehicle’s drivetrain. Machined from high-strength forged steel, the flange ensures precise rotational alignment and handles the high cyclic loads typical of heavy-duty industrial applications. The SKU 4644.303.409 is a direct replacement that maintains factory tolerances, and it is often installed alongside the 4644105414: DISCONNECTION clutch assembly and the 4644101222: TRANSMISSION HOUSING to ensure complete sealing and structural integrity.
Symptoms of Failure
- Transmission fluid seepage at the output shaft: A worn flange or damaged sealing surface allows oil to escape, leaving visible drips under the vehicle. This is a common long-tail search query for “ZF WG200 output flange oil leak.”
- Driveline vibration during acceleration: When the flange splines or bolt holes wear, rotational imbalance occurs, causing noticeable shuddering at highway speeds or under load.
- Clunking noise on gear engagement: Excessive play between the flange and output shaft produces a metallic knock when shifting from neutral to drive or reverse.
- Premature bearing failure in the transmission housing: A misaligned flange transfers stress to the 4644301226: TRANSMISSION HOUSING, accelerating wear on internal bearings and seals.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4644.303.409 |
| Material | Forged steel, induction-hardened spline |
| Outer Diameter | 180 mm (approx.) |
| Bolt Hole Circle | 150 mm (8 holes, M12) |
| Weight | 4.2 kg (9.3 lbs) |
| OEM Reference | ZF 4644.303.409 |
| Torque Capacity | 2,200 Nm (estimated) |
Compatibility
This output flange is designed primarily for the ZF WG200 series transmissions, including models WG180, WG200, and WG210 used in off-highway trucks, wheel loaders, and agricultural tractors. It also fits select variants of the ZF Ecomat 4HP and 5HP series when used with the appropriate 4475280078: ADAPTER. Always verify spline count and pilot diameter against your existing flange before installation. The 0636021083: HEXAGON SCREW is required for secure mounting to the output shaft.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105414 | DISCONNECTION | Clutch disconnect assembly for PTO |
| 0636021083 | HEXAGON SCREW | Fastener for flange-to-shaft mounting |
| 4644101222 | TRANSMISSION HOUSING | Main gearbox casing |
| 4644301226 | TRANSMISSION HOUSING | Rear housing section |
| 0730365067 | TYPE PLATE | Identification label for transmission |
| 0631311009 | GROOVED STUD | Alignment stud for housing assembly |
| 4644301298 | COVER PLATE | Sealing cover for access port |
| 0634306525 | O-RING | Seal between flange and shaft |
| 0636305026 | SCREW PLUG | Drain/fill plug for housing |
| 4475280078 | ADAPTER | Interface for non-standard drivelines |
