Overview
The ZF 4166.335.244 STATOR is a precision-engineered hydraulic component designed for the torque converter assembly in ZF WG200 and WG201 series transmissions. This OEM genuine part redirects fluid flow from the turbine to the pump impeller, multiplying torque during low-speed operation and ensuring efficient power transfer in heavy-duty industrial applications. The SKU 4166.335.244 sits directly between the turbine and pump within the converter housing, playing a critical role in maintaining hydraulic pressure and preventing fluid cavitation. When paired with a robust TRANSMISSION HOUSING, this stator ensures consistent performance under high-load conditions common in construction and agricultural machinery.
Symptoms of Failure
- Torque converter shudder or vibration during acceleration: A worn stator fails to redirect fluid properly, causing noticeable shuddering at low speeds when the converter is in stall mode.
- Delayed engagement or gear slipping in forward/reverse: Reduced hydraulic pressure from a damaged stator leads to soft shifts and hesitation when moving from neutral to drive.
- Overheating transmission fluid with no external leaks: A seized stator bearing creates excessive friction, generating heat that degrades fluid viscosity and accelerates wear on the TRANSMISSION HOUSING.
- Whining noise from the bell housing area: Worn stator splines or a failing one-way clutch produce a high-pitched whine that increases with engine RPM.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4166.335.244 |
| Material | Aluminum alloy with hardened steel spline insert |
| Weight | 2.4 kg (5.3 lbs) |
| Outer Diameter | 168 mm |
| Inner Diameter (spline) | 32 mm |
| Overall Height | 58 mm |
| OEM Reference | ZF 4166.335.244 |
| Torque Capacity | Up to 1,200 Nm |
Compatibility
This stator is engineered for ZF WG series powershift transmissions, specifically the WG180, WG200, and WG201 models. It is also compatible with certain WG150 variants when used with the correct SCREW PLUG and O-RING for sealing. The part fits both 4-speed and 6-speed configurations in these series, commonly found in ZF-built wheel loaders, telehandlers, and industrial tractors. Always verify spline count and stator bore diameter against your existing unit before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101232 | TRANSMISSION HOUSING | Encloses gear train and supports stator shaft |
| 4644301282 | TRANSMISSION HOUSING | Alternate housing variant for WG201 series |
| 4475280043 | SCREW PLUG | Seals hydraulic passages in the valve body |
| 0634306198 | O-RING | Prevents fluid leaks at stator mounting points |
| 0730365067 | TYPE PLATE | Identifies transmission model and serial number |
| 4644301298 | COVER PLATE | Protects torque converter access opening |
| 4644106301 | SHIFT SYSTEM | Controls clutch engagement via hydraulic spools |
| 4644306507 | COVER PLATE | Seals shift system compartment |
| 4644159302 | SHIFT SYSTEM | Alternate shift system for WG200 models |
| 4644306560 | VALVE BLOCK | Distributes hydraulic pressure to clutches |
