Overview
The ZF 4166.034.072 CONVERTER Torque Converter Assembly is a complete, direct-replacement unit engineered for the WG 200 Series of powershift transmissions. This critical component sits between the engine flywheel and the transmission input shaft, functioning as a hydraulic coupling that multiplies engine torque during low-speed operation and provides smooth power transfer under load. As a complete assembly, the SKU 4166.034.072 eliminates the need for internal rebuilds, offering a drop-in solution for heavy-duty industrial applications such as forklifts, loaders, and material handling equipment. When installed, it works in concert with the 4644101249: TRANSMISSION HOUSING to ensure proper alignment and fluid containment, while the 4644301402: TRANSMISSION HOUSING provides additional structural support for the converter assembly.
Symptoms of Failure
When the ZF 4166.034.072 torque converter begins to wear, operators will notice distinct performance degradation. Transmission overheating under light load is a primary indicator, often caused by a failing stator clutch that generates excessive heat. Shuddering or vibration during gear engagement occurs when the converter lock-up clutch loses friction material, leading to harsh shifts. Delayed or sluggish acceleration from a stop points to worn turbine splines or internal seal leakage, reducing hydraulic pressure. Additionally, dark, burnt-smelling transmission fluid signals internal wear debris circulating through the system, which can damage the 0634306323: O-RING seals and the 4644301298: COVER PLATE gasket surface.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4166.034.072 |
| Assembly Type | Complete Torque Converter Unit |
| Overall Diameter | 340 mm (13.4 in) |
| Overall Length | 185 mm (7.3 in) |
| Weight | 18.5 kg (40.8 lbs) |
| Housing Material | High-Grade Aluminum Alloy |
| Impeller Material | Heat-Treated Steel |
| OEM Reference | ZF 4166.034.072 |
| Fluid Capacity | 2.8 liters (0.74 gal) |
| Max Input Torque | 650 Nm (479 lb-ft) |
Compatibility
This torque converter assembly is specifically designed for the ZF WG 200 Series transmissions, including models WG180, WG200, and WG210. It is also compatible with select variants of the ZF 4WG-200 and 6WG-200 powershift units commonly found in telescopic handlers and rough-terrain forklifts. For proper installation, ensure the transmission housing is free of debris; the 4644101249: TRANSMISSION HOUSING and 4644301402: TRANSMISSION HOUSING must be inspected for cracks or warping. The 4644301298: COVER PLATE should be replaced simultaneously to maintain hydraulic integrity, and the 0634306323: O-RING must be renewed to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101249 | TRANSMISSION HOUSING | Encloses and aligns the torque converter assembly |
| 4644301402 | TRANSMISSION HOUSING | Secondary housing providing structural support |
| 4644301298 | COVER PLATE | Seals the converter access opening |
| 0634306323 | O-RING | Prevents fluid leaks at housing joints |
| 0636305026 | SCREW PLUG | Seals fluid drain and fill ports |
| 4644301279 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4644301088 | SEALING CAP | Protects exposed ports during service |
| 4644109044 | PARKING BRAKE | Secures output shaft when stationary |
| 0501211070 | BRAKE | Provides dynamic braking force |
| 0501317036 | PISTON | Actuates clutch and brake packs |
