Overview
The ZF 4661.044.021 3 WG 94 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the clutch packs, planetary gear sets, and hydraulic control components into a single, ready-to-install package. As the core of the WG 94 series, it manages torque distribution and speed changes under high load conditions. The SKU 4661.044.021 is a direct replacement for original equipment, ensuring precise fitment within the transmission housing. This complete unit eliminates the need for piecemeal repairs, reducing downtime for industrial loaders, graders, and material handlers.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the internal clutch packs or seals within the 4661.044.021 assembly degrade, the transmission may hesitate or fail to hold a gear, especially during heavy lifting or pushing operations.
- Delayed or harsh shifting between forward and reverse: Worn components can cause a noticeable lag or a jarring shift when changing direction, a common sign that the complete unit requires replacement.
- Contaminated transmission fluid with metallic debris: Internal wear from the planetary gears or bearings generates metal particles in the oil, often visible during routine fluid checks or filter changes.
- External oil leaks near the bell housing or output flange: Cracks or seal failures in the assembly can lead to fluid loss, which accelerates component damage and reduces hydraulic pressure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4661.044.021 |
| Assembly Type | Complete Powershift Unit (3 WG 94) |
| Estimated Weight | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF 3 WG 94 |
| Seal Type | Viton (high-temperature resistant) |
Compatibility
This complete assembly is engineered for the ZF WG 94 series, which includes models such as the WG180, WG200, and WG210. It is commonly used in ZF 3 WG 94 and 4 WG 94 configurations found in articulated dump trucks, wheel loaders, and telehandlers. The 4661.044.021 unit is not interchangeable with WG 80 or WG 120 series without significant modifications. For proper installation, ensure the TRANSMISSION HOUSING and the HOUSING II are free from cracks or warping. Secure the assembly using the CYLINDRICAL PIN for alignment, and affix the TYPE PLATE for correct identification after service.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101042 | TRANSMISSION HOUSING | Encloses and supports the gear train and clutch packs |
| 4661301108 | HOUSING II | Rear section housing the output shaft and bearings |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0769123894 | TYPE PLATE | Identification tag for transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports |
| 4660201008 | SCREW PLUG | Closes oil passages in the valve body |
| 0636100117 | SCREW PLUG | Drain plug for the torque converter housing |
| 0501211384 | VALVE | Modulates clutch pressure for smooth shifts |
| 0732042156 | COMPRESSION SPRING | Returns valve spools to neutral position |
| 0768409154 | SCREW PLUG | Seals the accumulator circuit |
