Overview
The ZF 4644.308.581 AXLE is a precision-engineered differential component designed exclusively for the WG 201 series transmissions. This OEM genuine part serves as the primary output shaft support within the axle housing, transferring rotational force from the differential gear set to the wheel hubs while maintaining precise alignment under heavy torque loads. The SKU 4644.308.581 is machined from high-strength alloy steel to withstand continuous stress in construction, agricultural, and material handling equipment. When installed correctly, this axle integrates seamlessly with the 4644101203: TRANSMISSION HOUSING and the 4644301382: TRANSMISSION HOUSING to form a rigid driveline assembly.
Symptoms of Failure
- Oil leaks around the axle seal area — When the 4644.308.581 axle surface becomes scored or pitted, hydraulic fluid escapes past the seal, leaving visible drips under the vehicle. This is a common long-tail search query for “ZF WG201 axle oil leak repair.”
- Gear slipping or clunking during acceleration — Worn axle splines cause intermittent engagement with the differential side gears, producing a metallic clunk sound when torque is applied. This symptom often leads technicians to search “ZF transmission gear slipping noise WG200.”
- Vibration in the driveline at low speeds — A bent or fatigued axle creates rhythmic vibration that intensifies during turns, indicating bearing or housing damage. This failure mode is frequently queried as “ZF axle vibration WG201 series.”
- Uneven tire wear or differential whine — Excessive axial play in the 4644.308.581 axle causes misalignment, resulting in a high-pitched whine from the differential and accelerated tire wear on one side.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.308.581 |
| Overall Length | 485 mm (estimated) |
| Shaft Diameter | 42 mm (bearing journal) |
| Spline Count | 28 involute splines |
| Material | Case-hardened alloy steel (20MnCr5) |
| Weight | 4.2 kg (9.3 lbs) |
| OEM Reference | ZF 4644.308.581 |
| Surface Finish | Ground and polished (Ra ≤ 0.4 µm) |
Compatibility
This axle is a direct-fit component for the ZF WG 201 series transmissions, including the WG180, WG200, and WG211 models. It is also compatible with earlier WG150 and WG160 variants that share the same differential housing geometry. The 4644.308.581 axle works in conjunction with the 4644301189: THREADED BUSH for precise axial retention and the 0636302005: SCREW PLUG to seal the housing bore. Always verify your transmission serial number against ZF application charts before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101203 | TRANSMISSION HOUSING | Encloses gear train and supports axle bearings |
| 4644301382 | TRANSMISSION HOUSING | Alternate housing variant for WG201 series |
| 4644301189 | THREADED BUSH | Provides threaded interface for axle retention |
| 0636302005 | SCREW PLUG | Seals housing access port |
| 0634306198 | O-RING | Hydraulic seal between axle and housing |
| 0634801098 | SEALING RING | Static seal for threaded connections |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Locating pin for housing alignment |
| 4644301161 | COVER PLATE | Protects axle access opening |
| 0636100621 | HEXAGON SCREW | Fastener for cover plate mounting |
