Overview
The ZF 4166.037.047 CONVERTER Torque Converter Assembly is a critical hydraulic coupling unit designed for the WG 251 Series transmission family. This complete assembly transfers engine torque to the transmission input shaft while multiplying rotational force during low-speed operation. The SKU 4166.037.047 sits directly between the engine flywheel and the transmission pump, converting mechanical energy into fluid power for smooth gear engagement. As a sealed, precision-balanced unit, it ensures minimal power loss and vibration dampening in heavy-duty industrial drivetrains. This torque converter is often replaced alongside the 4646101072: TRANSMISSION HOUSING to maintain optimal alignment and sealing integrity.
Symptoms of Failure
- Delayed or harsh shifting — A worn torque converter fails to lock up properly, causing noticeable hesitation between gears, especially under load.
- Transmission fluid overheating — Internal stator or clutch slippage generates excessive heat, often indicated by a burnt smell or dashboard warning lights.
- Shuddering during acceleration — Damaged converter vanes or bearings produce a rhythmic vibration when the vehicle moves from a stop, worsening with higher torque demand.
- Low stall speed or engine stalling — A failing one-way clutch prevents the converter from multiplying torque, causing the engine to lug or stall when idling in gear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4166.037.047 |
| Type | Complete Torque Converter Assembly |
| Outer Diameter | ~340 mm (13.4 in) |
| Weight | ~18.5 kg (40.8 lbs) |
| Housing Material | High-strength cast iron |
| Impeller & Turbine Material | Heat-treated alloy steel |
| OEM Reference | ZF 4166.037.047 / WG 251 |
| Seal Type | Viton dual-lip |
Compatibility
This torque converter assembly is engineered for the ZF WG 251 Series transmissions, which are widely used in construction, mining, and agricultural vehicles. It is directly compatible with the following ZF transmission models: WG180, WG200, WG211, WG251, and WG310. When installing the 4166.037.047, it is essential to inspect the 4646301201: HOUSING for cracks or wear, as misalignment can cause premature converter failure. Additionally, the 4646301166: COVER and 0636101051: CAP SCREW must be torqued to factory specifications to prevent fluid leaks. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Encloses gear sets and supports torque converter alignment |
| 4646301201 | HOUSING | Intermediate casing for clutch pack assembly |
| 4646301166 | COVER | Seals the converter cavity and retains fluid |
| 0636101051 | CAP SCREW | Fastens cover to housing with precise torque |
| 4646201018 | COVER SHEET | Thin gasket layer for vibration dampening |
| 4646301277 | SCREEN SHEET | Filter mesh protecting hydraulic circuits |
| 4646201019 | COVER SHEET | Secondary sealing shim for converter housing |
| 0730365125 | TYPE PLATE | Identification tag with serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for precise assembly |
| 0636010216 | HEXAGON SCREW | Secures transmission to engine bellhousing |
