Overview
The ZF 4661.001.019 4 WG 90 Powershift Transmission Assembly represents a complete, ready-to-install unit engineered for demanding off-highway applications. As the core hydraulic-mechanical assembly within the WG 90 Series, this SKU 4661.001.019 integrates the clutch packs, planetary gear sets, and valve body to deliver smooth, full-power shifts under load. This assembly sits directly between the torque converter and the output shaft, serving as the primary power transfer module. For structural integrity, it mounts directly to the 4661101020: TRANSMISSION HOUSING and the 4661301046: HOUSING II, which enclose the rotating components.
Symptoms of Failure
- Erratic or delayed gear engagement: When the assembly wears, operators may experience a noticeable lag between selecting a gear and the transmission responding, often accompanied by harsh engagement.
- Internal hydraulic pressure loss: Worn seals or piston rings within the unit cause a drop in clutch-apply pressure, leading to slipping under load and overheating of the transmission fluid.
- Metallic debris in the oil pan: As internal components degrade, fine metal particles or larger fragments from worn clutches or bearings will contaminate the hydraulic circuit, often visible during oil changes.
- Audible whining or grinding noises: A failing assembly will produce distinct mechanical noises from the planetary gears or clutch packs, particularly during directional shifts or when the transmission is under heavy torque.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4661.001.019 |
| Assembly Type | Complete Powershift Unit (4 WG 90) |
| Estimated Dry Weight | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Primary Material | High-Grade Cast Iron & Alloy Steel |
| OEM Reference | ZF 4661.001.019 |
| Hydraulic Connection | Integrated Valve Body (4 Clutches) |
Compatibility
This complete assembly is engineered specifically for the ZF WG 90 Series of powershift transmissions. It is directly compatible with models including the WG 90, WG 100, and WG 120, which are commonly found in wheel loaders, telehandlers, and industrial tractors. The unit also interfaces with the 4661301093: TUBE for lubrication flow and is secured using the 0631306174: CYLINDRICAL PIN for precise alignment during installation. Always verify your transmission serial number against the WG 90 series parts catalog to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101020 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4661301046 | HOUSING II | Secondary housing for clutch pack retention |
| 4661301093 | TUBE | Lubrication oil delivery conduit |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for assembly positioning |
| 0769123894 | TYPE PLATE | Identification and specification label |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports |
| 0636302602 | SCREW PLUG | Drain or fill port closure |
| 0634100633 | O-RING | Hydraulic seal between mating surfaces |
| 4661301041 | NOZZLE | Directed lubrication spray orifice |
| 4661301038 | NOZZLE | Secondary lubrication jet for gear cooling |
