Overview
The ZF 4661.134.006 CONVERTER Powershift Transmission Assembly is a complete, pre-assembled torque converter unit engineered for the WG 90 and WG 94 series. This critical component sits at the input of the transmission, directly coupling engine power to the gear train. As a complete assembly, it eliminates the need for piecemeal rebuilding, ensuring immediate hydraulic lock-up and smooth power delivery. The SKU 4661.134.006 is a direct OEM-grade replacement designed to restore full drivetrain performance in heavy-duty industrial applications.
Symptoms of Failure
- Torque converter shudder during low-speed maneuvering: A pronounced vibration or “fish-biting” sensation when creeping forward or reversing indicates internal stator or clutch wear in the 4661.134.006 assembly.
- Delayed engagement or “flare” between shifts: If the engine revs rise without immediate forward motion, the converter’s lock-up mechanism is failing, often accompanied by burnt transmission fluid.
- External oil leaks at the bell housing interface: Worn seals on the converter hub allow ATF to escape, leaving puddles under the vehicle and reducing hydraulic pressure across the system.
- Overheating transmission with no load: A failing converter generates excessive heat due to internal slippage, triggering warning lights even during light operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4661.134.006 |
| Assembly Type | Complete Converter Unit |
| Overall Diameter | 380 mm (14.96 in) |
| Overall Length | 210 mm (8.27 in) |
| Dry Weight | 18.5 kg (40.8 lbs) |
| Primary Material | Cast Aluminum Housing / Steel Turbine |
| OEM Reference | ZF 4661.134.006 |
| Torque Capacity | Up to 1,200 Nm (885 lb-ft) |
Compatibility
This converter assembly is engineered for the ZF WG180, WG200, and WG240 powershift transmission models. It is a direct fit for all WG 90 Series and WG 94 Series applications, including wheel loaders, forklifts, and industrial tractors. Always verify the spline count and pilot diameter against your specific transmission housing before installation.
Installation Context
When replacing the 4661.134.006, it is critical to inspect the surrounding components. The 4661101020: TRANSMISSION HOUSING must be free of cracks and wear, as it supports the converter’s alignment. The 4661301046: HOUSING II provides the rear support structure and should be checked for bore damage. Additionally, the 4661301093: TUBE routes lubrication oil to the converter; a blocked tube will starve the unit of cooling. Finally, the 0631306174: CYLINDRICAL PIN ensures precise dowel alignment between the housing sections—never reuse a worn pin.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101020 | TRANSMISSION HOUSING | Main structural casing supporting the converter and gear train |
| 4661301046 | HOUSING II | Rear housing section providing bearing support and oil galleries |
| 4661301093 | TUBE | Lubrication oil delivery tube to the converter assembly |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0769123894 | TYPE PLATE | Identification plate with serial number and model data |
| 0750100022 | SCREW PLUG | Sealing plug for oil drain or test ports |
| 0636302602 | SCREW PLUG | Magnetic drain plug for ferrous debris collection |
| 0634100633 | O-RING | Seal between converter hub and housing |
| 4661301041 | NOZZLE | Oil spray nozzle for clutch pack cooling |
| 4661301038 | NOZZLE | Secondary oil nozzle for planetary lubrication |
