Overview
The ZF 4168.030.120 CONVERTER Torque Converter Assembly is a critical hydraulic coupling component located between the engine flywheel and the transmission input shaft within the WG 100 Series. This complete unit transfers and multiplies engine torque while allowing the engine to idle without stalling. The SKU 4168.030.120 is engineered to precise OEM tolerances, ensuring smooth power delivery and efficient lock-up performance in heavy-duty industrial applications.
Symptoms of Failure
- Transmission shudder or vibration during acceleration – A worn torque converter can cause noticeable shaking, especially when the converter lock-up clutch engages, indicating internal stator or clutch plate damage.
- Delayed or harsh gear engagement – If the converter fails to build proper hydraulic pressure, operators may experience a significant lag when shifting from neutral to drive or reverse.
- Overheating transmission fluid – A failing converter generates excessive heat due to internal slippage, often leading to burnt-smelling fluid and reduced system efficiency.
- Low stall speed or engine stalling – When the converter’s one-way clutch fails, the engine may stall when coming to a stop, or the vehicle may lack power during low-speed maneuvers.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4168.030.120 |
| Assembly Type | Complete Torque Converter Unit |
| Outer Diameter | ~340 mm (estimated) |
| Weight | ~18.5 kg (estimated) |
| Housing Material | High-strength cast steel |
| Impeller & Turbine Material | Heat-treated aluminum alloy |
| OEM Reference | ZF 4168.030.120 |
| Seal Type | Integrated O-ring groove |
Compatibility
This torque converter assembly is specifically designed for the ZF WG 100 Series transmission family. It is compatible with models including the WG180, WG200, and WG210 series used in off-highway vehicles, wheel loaders, and industrial machinery. Always verify your transmission model and serial number before installation.
During replacement, it is essential to inspect the surrounding components. The 4651101007 TRANSMISSION HOUSING must be checked for cracks or warping. The 4651301029 HOUSING and 4651301024 HOUSING should be examined for wear at the mounting faces. A new 0634303928 O-RING is always recommended to prevent fluid leaks at the converter-to-housing interface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4651301029 | HOUSING | Converter housing adapter section |
| 0634303928 | O-RING | Seals converter-to-housing joint |
| 4651301024 | HOUSING | Rear housing for pump support |
| 4651203002 | SCREEN SHEET | Filter screen for oil intake |
| 4651303005 | SCREEN SHEET | Secondary filter screen element |
| 0636101032 | CAP SCREW | Fastener for housing assembly |
| 0630361028 | SEALING CAP | Closes hydraulic test ports |
| 4475280060 | SCREW PLUG | Threaded plug for drain holes |
| 0634303312 | O-RING | Seal for screw plug interface |
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