Overview
The ZF 4066.302.596 TURBINE WHEEL is a critical rotating component within the torque converter assembly of the WG 65 Series transmission. This OEM genuine part is responsible for converting hydraulic energy from the impeller into mechanical torque, which is then transferred to the transmission input shaft. As the driven member of the torque converter, the turbine wheel directly influences shift quality and power delivery. The SKU 4066.302.596 is precision-engineered to ZF’s exacting tolerances, ensuring seamless integration with the TRANSMISSION HOUSING and the OUTPUT shaft assembly. When paired with a properly torqued HEXAGON SCREW set, this turbine wheel maintains the hydraulic lock-up necessary for efficient power transfer in heavy-duty applications.
Symptoms of Failure
When the ZF 4066.302.596 turbine wheel begins to wear, operators typically notice these four distinct failure modes:
- Torque converter shudder or vibration during acceleration – Worn turbine blades cause uneven fluid flow, leading to noticeable driveline shudder under load.
- Delayed engagement or gear slipping – A degraded turbine wheel cannot maintain proper hydraulic pressure, resulting in sluggish takeoff or slipping between gears.
- Overheating transmission fluid – Reduced turbine efficiency forces the torque converter to generate excess heat, often indicated by burnt-smelling ATF.
- Metallic debris in transmission pan – As the turbine wheel erodes, fine metal particles contaminate the fluid, which can be detected during routine oil changes.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4066.302.596 |
| OEM Reference | ZF 4066.302.596 |
| Material | High-strength aluminum alloy with hardened steel hub |
| Weight | Approx. 3.2 kg (7.1 lbs) |
| Outer Diameter | 265 mm |
| Hub Spline Count | 27-tooth internal spline |
| Torque Capacity | Up to 650 Nm |
Compatibility
This turbine wheel is specifically designed for the ZF WG 65 Series transmission family. Based on its spline configuration and diameter, the 4066.302.596 is compatible with the following ZF models: WG65, WG120, WG180, and WG200. It is also used in select variants of the WG250 series. Always verify the OUTPUT FLANGE compatibility when replacing this part, as flange wear can accelerate turbine damage. The turbine wheel must be installed with a new TRANSMISSION HOUSING gasket and properly torqued HEXAGON SCREW fasteners to prevent fluid leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105402 | OUTPUT | Transfers torque from turbine to driveline |
| 4005303005 | OUTPUT FLANGE | Connects output shaft to driveshaft |
| 4616101119 | TRANSMISSION HOUSING | Encloses and supports internal components |
| 0636011038 | HEXAGON SCREW | Secures housing and turbine assembly |
| 0636011118 | HEXAGON SCREW | Fastener for valve body mounting |
| 0636016015 | HEXAGON SCREW | High-torque fastener for bell housing |
| 0631306085 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0634313118 | O-RING | Seals fluid passages between components |
| 0636304019 | SCREW PLUG | Seals inspection or drain ports |
| 0634801152 | SEALING RING | Prevents fluid leaks at shaft interfaces |
