Overview
The ZF 4661.004.022 4 WG 94 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single ready-to-install package. As the core rotating assembly within the WG 94 series, it directly governs torque distribution and gear ratio changes. The SKU 4661.004.022 is a direct OEM replacement, ensuring precise fitment within the transmission housing. When rebuilding a powershift unit, this complete assembly eliminates the need to source individual gears and shafts, reducing downtime. It interfaces directly with the 4661101023: TRANSMISSION HOUSING and the 4661301051: HOUSING II to form the sealed driveline envelope.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, clutch pack clearances increase, causing a noticeable lag when shifting from neutral to forward or reverse. This often manifests as a “clunk” under load.
- Intermittent gear slipping under load: Worn thrust washers or damaged gear teeth within the 4661.004.022 unit allow the gear train to lose torque transfer, particularly when climbing grades or pushing heavy loads.
- Metallic debris in the oil filter: Internal spalling of gears or bearing raceways generates fine metallic particles. If you find silver or bronze flakes during routine oil changes, the internal assembly is likely degrading.
- Constant oil leaks at the PTO interface: A failing input shaft seal inside the assembly can pressurize the housing, forcing transmission fluid past the 0631306174: CYLINDRICAL PIN alignment points and out of the bell housing.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4661.004.022 |
| Assembly Type | Complete Powershift (4 WG 94) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Primary Material | Alloy Steel (gears) / Cast Iron (carrier) |
| Max Input Torque | 1,200 Nm (885 lb-ft) |
| OEM Reference | ZF 4 WG 94 |
Compatibility
This complete assembly is engineered specifically for the ZF WG 94 series of powershift transmissions. It is a direct fit for the following models: WG94, WG180 (early variants using the 94mm gear center), and WG200 (when equipped with the 4-speed planetary option). It is also compatible with select 4WG-94 and 4WG-180 configurations found in telehandlers and wheel loaders. Always verify your transmission serial number against the housing casting to confirm the 4661.004.022 assembly is correct. The assembly mounts securely within the 4661301093: TUBE which routes lubrication oil to the upper gear cluster.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101023 | TRANSMISSION HOUSING | Main structural case for the gear assembly |
| 4661301051 | HOUSING II | Rear cover supporting output shaft bearings |
| 4661301093 | TUBE | Lubrication oil delivery conduit |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 0750100022 | SCREW PLUG | Seals oil drain or fill ports |
| 0636302602 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0634100633 | O-RING | Seals plug and tube interfaces |
| 4661301029 | NOZZLE | Sprays oil onto clutch packs |
| 4661301027 | NOZZLE | Secondary oil spray for gear mesh |
