Overview
The ZF 4166.035.211 CONVERTER Torque Converter Assembly is a critical hydraulic coupling unit that transfers engine torque to the transmission input shaft within ZF WG series powershift transmissions. Positioned between the flywheel and the gearset, this complete unit modulates power delivery through fluid coupling, enabling smooth acceleration and load management under heavy-duty conditions. The SKU 4166.035.211 is engineered as a direct-fit replacement assembly, eliminating the need for core rebuilds. When installing this converter, ensure the TRANSMISSION HOUSING and TRANSMISSION HOUSING are free from cracks or warping, as housing integrity directly affects converter alignment and oil flow.
Symptoms of Failure
- Torque converter shudder or vibration during low-speed engagement — Worn internal stator bearings or damaged clutch friction surfaces cause irregular power transfer, often felt as a shaking sensation when accelerating from a stop.
- Transmission fluid overheating and darkening — A failing converter generates excessive heat due to internal slippage, leading to burnt-smelling fluid and potential damage to the TYPE PLATE identification marker from thermal expansion.
- Delayed or harsh gear engagement — Reduced hydraulic pressure from a worn torque converter pump impeller results in sluggish shifts or abrupt clunking when selecting forward or reverse.
- Visible oil leaks near the bell housing area — Failed converter hub seals or cracked housing flanges allow transmission fluid to escape, often pooling beneath the vehicle. Check the GROOVED STUD fasteners for proper torque retention during replacement.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4166.035.211 |
| Assembly Type | Complete Torque Converter Unit |
| Overall Diameter | 340 mm (13.4 in) |
| Overall Length | 180 mm (7.1 in) |
| Weight | 18.5 kg (40.8 lbs) |
| Housing Material | Cast Aluminum Alloy |
| Impeller Material | Heat-Treated Steel |
| OEM Reference | ZF 4166.035.211 |
| Fluid Capacity | 2.8 liters (0.74 gal) |
| Max Torque Rating | 1,200 Nm (885 lb-ft) |
Compatibility
This torque converter assembly is specifically designed for ZF WG 200 Series and WG 201 Series powershift transmissions. It is also compatible with the following ZF transmission models: WG180, WG200, WG201, and WG210. The unit fits both standard and heavy-duty configurations used in construction, agricultural, and material handling equipment. For proper installation, verify that the COVER PLATE and COVER PLATE are not deformed, and replace the O-RING and SCREW PLUG during reassembly to prevent leaks. The SCREEN SHEET and SEALING CAP should also be inspected for debris or damage before final assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Encloses and aligns the torque converter and gearset |
| 4644301223 | TRANSMISSION HOUSING | Secondary housing section for converter support |
| 0730365067 | TYPE PLATE | Identification plate for transmission model and serial number |
| 0631311009 | GROOVED STUD | Fastener for securing housing sections together |
| 4644303060 | COVER PLATE | Protects converter access opening from debris |
| 4644303061 | COVER PLATE | Alternate cover plate for different housing configurations |
| 0634306525 | O-RING | Seals fluid passages between converter and housing |
| 0636305026 | SCREW PLUG | Closes drain or fill ports in the transmission |
| 4644301279 | SCREEN SHEET | Filters debris from hydraulic fluid entering the converter |
| 4644301088 | SEALING CAP | Prevents fluid leakage from unused housing ports |
