Overview
The ZF 4166.041.018 CONVERTER Torque Converter Assembly is a complete, drop-in replacement unit engineered for the WG 65 Series transmission family. As the critical hydraulic coupling between the engine and gearbox, this torque converter multiplies engine torque during launch and smoothly locks up for efficient cruising. The SKU 4166.041.018 is a fully assembled converter, including the impeller, turbine, stator, and lock-up clutch, ready for direct installation. It sits directly on the input shaft of the transmission, housed within the TRANSMISSION HOUSING, and is secured by the HEXAGON SCREW set that mounts the bell housing to the engine block.
Symptoms of Failure
- Shudder or vibration during acceleration: A worn torque converter stator clutch or damaged turbine fins cause noticeable shuddering, especially between 20-40 mph. This is a common long-tail search query for “ZF torque converter shudder fix.”
- Transmission overheating and fluid darkening: Internal slippage from a failing lock-up clutch generates excessive heat, turning the ATF dark and burnt. Operators often search for “WG 65 transmission overheating causes.”
- Delayed or harsh engagement from Park to Drive: A degraded converter one-way clutch or worn pump drive hub results in a 2-3 second delay before the vehicle moves, accompanied by a hard clunk.
- Torque converter drain-back noise: A rattling or grinding sound from the bell housing area, especially on cold starts, indicates worn needle bearings or a failing stator support.
Technical Specifications
| Part Number | 4166.041.018 |
| Series | WG 65 |
| Overall Diameter | ~340 mm (13.4 in) |
| Weight | ~18.5 kg (40.8 lbs) |
| Housing Material | High-strength aluminum alloy (A356-T6) |
| Impeller Blade Count | 39 (stamped steel) |
| Lock-Up Clutch Type | Wet, multi-plate with damper springs |
| OEM Reference | ZF 4166.041.018 (OEM direct) |
| Max Input Torque | ~1,200 Nm (885 lb-ft) |
Compatibility
This torque converter assembly is specifically designed for the ZF WG 65 Series transmissions, including models such as the WG180, WG200, and WG250. It is a direct fit for all WG 65 variants used in off-highway trucks, wheel loaders, and industrial machinery. The converter mates to the HOUSING and the 4 WG 65 planetary gearset assembly. Always verify your transmission model tag before ordering. For proper sealing, ensure the O-RING and SEALING CAP are replaced during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616000217 | 4 WG 65 | Planetary gearset assembly |
| 4616101101 | TRANSMISSION HOUSING | Main structural case for gear train |
| 0636011118 | HEXAGON SCREW | Bell housing to engine fastening |
| 4616301304 | HOUSING | Converter housing cover |
| 4616301309 | HOUSING | Rear housing adapter |
| 0630361069 | SEALING CAP | Converter drain plug seal |
| 0636011038 | HEXAGON SCREW | Converter-to-flexplate bolt |
| 0636016015 | HEXAGON SCREW | Housing-to-transmission bolt |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing |
| 0634313118 | O-RING | Converter hub seal |
