Overview
The ZF 4168.030.081 CONVERTER Torque Converter Assembly is a critical hydraulic component within the WG 150 Series transmission system. This complete unit serves as the fluid coupling between the engine and the gearbox, multiplying engine torque during launch and providing smooth power delivery during shifting. The SKU 4168.030.081 represents a fully assembled, ready-to-install torque converter, eliminating the need for separate stator, impeller, or turbine assembly. It sits directly between the engine flexplate and the transmission input shaft, housed securely within the TRANSMISSION HOUSING (part 4642101108) and the TRANSMISSION HOUSING (part 4642301208) to ensure precise alignment and oil flow.
Symptoms of Failure
When the ZF 4168.030.081 torque converter begins to fail, operators will notice distinct performance degradation. Look for these specific failure symptoms to diagnose a worn unit:
- Shuddering during lockup: A vibration felt through the driveline when the converter clutch engages, often described as “torque converter shudder” in heavy equipment.
- Delayed or harsh engagement: A noticeable lag when shifting from neutral to drive or reverse, accompanied by a hard clunk as the converter fills.
- Overheating transmission fluid: Persistent high oil temperatures due to internal stator clutch failure, causing the converter to slip excessively.
- Stall speed deviation: Engine RPM during stall testing is significantly higher or lower than factory specifications, indicating worn turbine splines or damaged impeller vanes.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4168.030.081 |
| Assembly Type | Complete Torque Converter Unit |
| Outer Diameter | 385 mm (estimated) |
| Mounting Bolt Pattern | 6-bolt, 180 mm BCD |
| Weight | 22.5 kg (49.6 lbs) |
| Housing Material | Cast Aluminum with Steel Hub |
| OEM Reference | ZF 4168.030.081 |
| Torque Capacity | Up to 1,200 Nm |
Compatibility
This torque converter assembly is specifically engineered for the ZF WG 150 Series transmission family. While the WG 150 is the primary application, the 4168.030.081 unit is also compatible with the WG 180 and WG 200 series transmissions when used with the correct ADAPTER (part 4642306254). It is not recommended for the WG 120 or WG 250 series without verifying input shaft spline count. Always confirm the TYPE PLATE (part 0730365125) on your transmission housing to match the exact series before installation. The converter is secured using the GROOVED STUD (part 0631311009) for proper alignment with the flexplate.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Main housing enclosing the converter assembly |
| 4642301208 | TRANSMISSION HOUSING | Secondary housing for bellhousing section |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment stud for converter mounting |
| 4642301168 | SCREEN SHEET | Filter screen for transmission oil circuit |
| 4642301169 | SCREEN SHEET | Secondary filter screen for converter circuit |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 0630361029 | SEALING CAP | Cap for converter test port |
| 4642306254 | ADAPTER | Adapter for cross-series compatibility |
| 0634303340 | O-RING | Seal between converter and pump |
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