Overview
The ZF 4168.034.025 CONVERTER Torque Converter Assembly is a complete, drop-in replacement unit engineered for the WG 180 and WG 200 series transmissions. This critical component sits between the engine flywheel and the transmission input shaft, functioning as a fluid coupling that multiplies engine torque while dampening driveline vibrations. As a fully assembled unit, the SKU 4168.034.025 eliminates the need for complex disassembly, ensuring a direct swap that restores hydraulic lock-up performance. When paired with a robust TRANSMISSION HOUSING or a TRANSMISSION HOUSING, this converter maintains precise alignment and oil flow integrity. Always verify the TYPE PLATE on your existing unit to confirm compatibility, and secure the assembly using a GROOVED STUD for proper mounting torque.
Symptoms of Failure
- Shuddering during lock-up engagement: A worn torque converter causes noticeable vibration or “fish-biting” sensation when the clutch locks at highway speeds, often misdiagnosed as transmission slipping.
- Delayed or harsh acceleration: If the converter fails to multiply torque efficiently, you will experience sluggish takeoff from a stop, especially under load in industrial applications.
- Overheating transmission fluid: A failing stator or damaged internal bearings generate excessive heat, leading to burnt-smelling ATF and potential damage to seals and the COVER PLATE.
- Whining or rattling noises from bell housing: Worn needle bearings or a cracked turbine hub produce metallic sounds that intensify with engine RPM, indicating imminent converter failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4168.034.025 |
| Assembly Type | Complete Torque Converter Unit |
| Overall Diameter | ~340 mm (13.4 in) |
| Pilot Diameter | ~55 mm (2.17 in) |
| Mounting Bolt Pattern | 6-bolt, 10.9 grade |
| Material | High-strength steel housing with hardened stator |
| Weight | ~18.5 kg (40.8 lbs) |
| OEM Reference | ZF 4168.034.025 |
| Fluid Capacity | ~1.2 liters (0.32 gal) |
Compatibility
This torque converter assembly is specifically designed for ZF WG 180 and WG 200 series transmissions. It is a direct fit for models including WG180, WG180A, WG200, and WG200A, commonly found in medium-duty trucks, construction loaders, and agricultural tractors. The unit also cross-references with select Voith and Allison applications where ZF adapters are used. For proper sealing, always replace the O-RING and SCREW PLUG during installation. If your application uses a remote mount, verify the ADAPTER and BREATHER are clear of debris. The SCREEN SHEET should also be inspected to prevent contamination from entering the converter circuit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101131 | TRANSMISSION HOUSING | Encloses gear train and supports converter alignment |
| 4644301228 | TRANSMISSION HOUSING | Alternate housing variant for WG200 series |
| 0730365067 | TYPE PLATE | Identification plate for transmission model verification |
| 0631311009 | GROOVED STUD | Secures converter to flexplate with precise torque |
| 4644301298 | COVER PLATE | Protects converter access opening from debris |
| 0634306525 | O-RING | Seals converter-to-housing oil passages |
| 0636305026 | SCREW PLUG | Drain or fill plug for converter circuit |
| 4475280078 | ADAPTER | Converts mounting pattern for non-ZF engines |
| 0501316470 | BREATHER | Vents pressure from converter housing |
| 4644301279 | SCREEN SHEET | Filters debris from converter oil flow |
