Overview
The ZF 4644.303.566 OUTPUT SHAFT is a critical torque-transfer component engineered specifically for the WG 200 Series powershift transmission. This OEM genuine part transmits rotational force from the planetary gear set to the driveline, ensuring smooth power delivery in heavy-duty industrial applications. The shaft sits within the rear section of the transmission housing, directly interfacing with the output flange to convert gear reduction into usable wheel or PTO speed. As a precision-machined component, the SKU 4644.303.566 is manufactured to exact ZF tolerances, guaranteeing a direct replacement without modification. When paired with a properly torqued 0636021036: HEXAGON SCREW and a correctly aligned 4644303538: OUTPUT FLANGE, this shaft maintains concentricity under extreme loads.
Symptoms of Failure
- Transmission oil leaks at the rear seal: A worn output shaft bearing journal or seal surface allows transmission fluid to weep past the rear seal, leaving puddles under the vehicle.
- Vibration during acceleration or deceleration: Excessive radial play in the shaft causes driveline shudder, particularly noticeable at low speeds or under load.
- Intermittent gear slipping or delayed engagement: A damaged output shaft spline can prevent the 4644105424: DISCONNECTION clutch from fully engaging, resulting in power loss during shifts.
- Metallic grinding noise from the transmission bell housing: Worn shaft splines or a cracked shaft produce a distinct grinding sound when the transmission is in gear.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.303.566 |
| Overall Length | 385 mm (estimated) |
| Shaft Diameter (bearing seat) | 55 mm (estimated) |
| Spline Count | 24-tooth involute (estimated) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 4.2 kg (estimated) |
| OEM Reference | ZF 4644.303.566 |
| Surface Treatment | Black oxide corrosion protection |
Compatibility
This output shaft is a direct fit for the ZF WG 200 Series transmission family, including the WG180, WG200, and WG210 models commonly found in forklifts, wheel loaders, and telehandlers. It also serves as a service replacement for certain WG150 variants when used with the correct 4644101224: TRANSMISSION HOUSING. Always verify the shaft spline count and overall length against your existing unit before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105424 | DISCONNECTION | Clutch assembly for gear engagement |
| 4644303538 | OUTPUT FLANGE | Connects shaft to driveline |
| 0636021036 | HEXAGON SCREW | Secures flange to shaft |
| 4644101224 | TRANSMISSION HOUSING | Main structural casing |
| 4644301346 | TRANSMISSION HOUSING | Alternate housing variant |
| 0730365067 | TYPE PLATE | Identification label |
| 4644106300 | SHIFT SYSTEM | Hydraulic shift control |
| 4644306500 | COVER PLATE | Seals housing opening |
| 4644159311 | SHIFT SYSTEM | Secondary shift assembly |
| 4644306563 | VALVE BLOCK | Hydraulic pressure regulation |
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