Overview
The ZF 4166.332.188 PUMP WHEEL is a critical torque converter component engineered specifically for the WG 201 Series transmission family. This OEM genuine part serves as the primary hydraulic impeller within the converter assembly, responsible for directing transmission fluid flow from the pump to the turbine. By converting engine torque into hydraulic energy, the pump wheel ensures smooth power transfer and efficient gear engagement. The SKU 4166.332.188 is precision-machined to OEM tolerances, guaranteeing direct fitment and long service life in demanding industrial applications.
Symptoms of Failure
When the ZF 4166.332.188 PUMP WHEEL begins to wear, operators may notice several distinct performance issues. Delayed or harsh gear engagement often occurs as the impeller loses its ability to generate adequate hydraulic pressure. Another common symptom is transmission overheating, caused by reduced fluid circulation and increased internal friction. You may also experience erratic shifting or gear slipping under load, particularly during low-speed maneuvers. Finally, visible metallic debris in the transmission fluid indicates pump wheel vane degradation, requiring immediate replacement to prevent cascading damage to the TRANSMISSION HOUSING.
Technical Specifications
| Part Number | 4166.332.188 |
| Material | High-strength aluminum alloy with hardened steel hub insert |
| Outer Diameter | 320 mm (12.6 in) |
| Hub Bore Diameter | 45 mm (1.77 in) |
| Overall Height | 85 mm (3.35 in) |
| Weight | 4.2 kg (9.26 lbs) |
| OEM Reference | ZF 4166.332.188 |
| Vane Count | 24 |
| Max Operating Pressure | 18 bar (261 psi) |
Compatibility
This pump wheel is designed for the ZF WG 201 Series transmissions, including models such as WG180, WG200, WG201, WG210, and WG220. It is also compatible with select ZF Ecomat 4HP and ZF Ecolife variants that share the same torque converter architecture. For proper installation, ensure the mating TRANSMISSION HOUSING is free of wear. The THREADED BUSH and SCREW PLUG should be inspected and replaced if necessary during pump wheel service.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG201 |
| 4644301189 | THREADED BUSH | Wear-resistant bushing for housing bores |
| 4475280043 | SCREW PLUG | Seals hydraulic passages |
| 0634306198 | O-RING | Prevents fluid leaks at joints |
| 0730365067 | TYPE PLATE | Identification plate for transmission |
| 4644301161 | COVER PLATE | Protects internal components |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 0631610020 | SET SCREW | Adjustable locking fastener |
| 0501218540 | BREATHER | Equalizes internal pressure |
