Overview
The ZF 4168.028.376 CONVERTER Torque Converter Assembly is a critical hydraulic coupling unit that transfers engine torque to the transmission input shaft while multiplying rotational force during low-speed operation. Positioned between the engine flywheel and the gearbox pump, this complete unit integrates a lock-up clutch, turbine, stator, and impeller within a sealed housing. The SKU 4168.028.376 is engineered for direct replacement in ZF WG 90 Series and WG 94 Series drivelines, ensuring seamless power delivery in heavy-duty industrial applications. When replacing this converter, it is essential to inspect the 4661101032: TRANSMISSION HOUSING for cracks or warping, as alignment tolerances directly affect converter performance.
Symptoms of Failure
- Torque converter shudder or vibration at low speeds: Worn stator bearings or damaged turbine fins cause intermittent shuddering during acceleration, often misdiagnosed as transmission slipping.
- Overheating transmission fluid with burnt odor: A failing lock-up clutch or blocked impeller passages generate excessive heat, leading to fluid degradation and potential seal failure.
- Delayed or harsh engagement when shifting from Park to Drive: Internal leakage past the converter hub reduces hydraulic pressure, causing a noticeable lag before gear engagement.
- Fluid leaks near the bell housing area: Deteriorated converter hub seals or cracks in the welded assembly allow ATF to escape, leaving puddles under the vehicle.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4168.028.376 |
| Assembly Type | Complete Torque Converter (Lock-up Clutch Included) |
| Outer Diameter | ~340 mm (estimated) |
| Overall Length | ~180 mm (estimated) |
| Weight | ~18.5 kg (40.8 lbs) |
| Housing Material | Cast Steel with Friction-Welded Hub |
| OEM Reference | ZF 4168.028.376 |
| Fluid Capacity | ~1.2 liters (ATF Dexron III) |
Compatibility
This torque converter assembly is designed for ZF WG 90 Series and WG 94 Series transmissions, specifically models including WG180, WG200, and WG210. It is also compatible with select WG 92 variants used in forklifts and construction loaders. Always verify the bell housing bolt pattern and pilot diameter against your existing unit. During installation, ensure the 4661301047: HOUSING II is free of debris, and replace the 0631306174: CYLINDRICAL PIN if worn to maintain precise alignment. Additionally, the 4661301093: TUBE should be inspected for blockages that could restrict fluid flow to the converter.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101032 | TRANSMISSION HOUSING | Encloses gear train and supports converter assembly |
| 4661301047 | HOUSING II | Rear housing section for output shaft support |
| 4661301093 | TUBE | Oil feed tube for converter lubrication |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0769123894 | TYPE PLATE | Identification plate with transmission serial number |
| 0750100022 | SCREW PLUG | Seals oil drain or test port |
| 0636302602 | SCREW PLUG | Magnetic plug for ferrous debris capture |
| 0634100633 | O-RING | Seals converter hub to pump interface |
| 4661301041 | NOZZLE | Directs oil flow to clutch packs |
| 4661301062 | NOZZLE | Secondary oil jet for planetary lubrication |
