ZF 4166.035.172 CONVERTER Torque Converter Assembly | Complete Unit

Overview

The ZF 4166.035.172 CONVERTER Torque Converter Assembly is a critical hydraulic coupling component that sits between the engine flywheel and the transmission input shaft within the WG 200 Series. This complete unit transfers and multiplies engine torque to the gearset, enabling smooth power delivery during vehicle startup and gear changes. The SKU 4166.035.172 replaces worn or failed torque converters to restore driveline efficiency and prevent overheating in heavy-duty industrial applications. As a complete assembly, it includes the impeller, turbine, stator, and lock-up clutch, ensuring direct bolt-on replacement for minimal downtime.

Symptoms of Failure

• Transmission shudder or vibration during acceleration: Worn internal bearings or damaged fins in the 4166.035.172 cause uneven torque transfer, leading to noticeable shaking at low speeds.
• Delayed engagement or gear slipping: A failing torque converter fails to build adequate hydraulic pressure, resulting in a lag when shifting from neutral to drive or reverse.
• Overheating transmission fluid: Internal leakage or stator clutch failure forces the converter to generate excessive heat, often indicated by burnt-smelling ATF or dashboard temperature warnings.
• Whining or grinding noises from the bell housing: Worn needle bearings or a damaged lock-up clutch produce metallic sounds that intensify with engine RPM.

Technical Specifications

Compatibility

This torque converter assembly is engineered for ZF WG 200 Series transmissions, including the WG180, WG200, and WG210 models. It is also compatible with select WG 180 Series variants that share the same bell housing pattern and input shaft spline count. The 4166.035.172 is designed for use in off-highway vehicles, construction equipment, and industrial machinery where the WG transmission is factory-installed. Always verify the pilot bore diameter and flexplate bolt pattern before installation.

When replacing the torque converter, it is essential to inspect and replace the 4644105423 DISCONNECTION unit to ensure proper hydraulic circuit isolation. The 4644303054 OUTPUT FLANGE must be checked for spline wear, as a damaged flange can misalign the converter. Secure the assembly using the 0636021010 HEXAGON SCREW set, torqued to factory specifications. Additionally, the 4644101229 TRANSMISSION HOUSING should be inspected for cracks or warping that could affect converter alignment.

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