Overview
The ZF 4166.341.151 PUMP WHEEL is a critical torque converter component engineered specifically for the WG 65 Series transmission. This OEM genuine part, identified by SKU 4166.341.151, serves as the primary hydraulic impeller within the converter assembly, responsible for directing transmission fluid flow to generate the torque multiplication necessary for heavy-duty vehicle operation. Positioned directly between the TRANSMISSION HOUSING and the turbine assembly, this pump wheel ensures consistent hydraulic pressure delivery during start-up and low-speed maneuvers. Its precision-machined vanes and balanced rotor design minimize cavitation while maximizing fluid coupling efficiency, directly impacting shift quality and overall drivetrain durability in vocational trucks and industrial equipment.
Symptoms of Failure
- Delayed or harsh engagement – A worn pump wheel reduces hydraulic pressure, causing noticeable lag when shifting from neutral to drive or reverse, often accompanied by a jarring engagement.
- Transmission overheating – Inefficient fluid circulation from a damaged impeller forces the transmission to run hotter than normal, triggering warning lights or fluid degradation.
- Loss of power under load – Operators may experience sluggish acceleration or inability to maintain speed on inclines, as the pump wheel fails to generate adequate torque converter multiplication.
- Whining or grinding noises – Worn vanes or bearing surfaces produce metallic sounds from the bell housing area, particularly during throttle application or gear changes.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4166.341.151 |
| Material | High-strength aluminum alloy with hardened steel hub insert |
| Outer Diameter | 340 mm (estimated) |
| Vane Count | 27 precision-cast vanes |
| Weight | 4.8 kg (10.6 lbs) |
| OEM Reference | ZF 4166.341.151 (Genuine) |
| Torque Capacity | Up to 2,500 Nm (estimated) |
Compatibility
This pump wheel is designed for the ZF WG 65 Series transmission family, including models such as the WG180, WG200, and WG210. It also fits select variants of the WG 65-3 and WG 65-4 configurations commonly found in municipal trucks, refuse vehicles, and construction equipment. For proper installation, ensure the HEXAGON SCREW (0636011118) is torqued to factory specifications when securing the pump wheel to the converter cover. Additionally, verify compatibility with the HOUSING (4616301307) and HOUSING (4616301309) assemblies, as these components form the structural boundary for the torque converter unit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101066 | TRANSMISSION HOUSING | Main structural casing for gear train and converter assembly |
| 0636011118 | HEXAGON SCREW | Fastener for pump wheel to converter cover |
| 4616301307 | HOUSING | Torque converter housing section |
| 4616301309 | HOUSING | Torque converter housing section (alternate variant) |
| 0636011038 | HEXAGON SCREW | Mounting screw for housing assembly |
| 0636016015 | HEXAGON SCREW | High-torque fastener for structural joints |
| 0631306085 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 0634313118 | O-RING | Hydraulic seal between housing sections |
| 0636304019 | SCREW PLUG | Fluid drain or inspection port plug |
| 0634801152 | SEALING RING | Static seal for plug or fitting interfaces |
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