Overview
The ZF 4661.043.026 3 WG 94 Powershift Transmission Assembly | Complete Unit is a fully assembled drop-in replacement designed for heavy-duty off-highway applications. This complete unit integrates the main gear cluster, clutch packs, and hydraulic control circuits into a single, pre-tested assembly. As the core power transfer module in the WG 94 series, it directly manages torque distribution across all forward and reverse ranges. The SKU 4661.043.026 is the definitive reference for this complete assembly, ensuring exact fitment without the need for sub-component matching. This unit works in concert with the 4661101036: HOUSING and the 4661301094: HOUSING to form the sealed transmission casing.
Symptoms of Failure
- Delayed or harsh gear engagement: When the complete unit wears, internal clutch clearance increases, causing a noticeable lag or a jarring shift when moving from neutral to drive or reverse.
- Intermittent power loss under load: A failing assembly may allow internal pressure to bleed off, resulting in the transmission slipping or losing drive torque when climbing grades or hauling heavy loads.
- Contaminated transmission fluid with metallic debris: Worn bearings or clutch plates within the unit shed metal particles into the oil, visible during routine fluid changes as a silver or dark sludge.
- External oil seepage at mating flanges: Degraded seals between the assembly and the 0631306174: CYLINDRICAL PIN alignment points can cause slow drips, leaving oil stains under the vehicle.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4661.043.026 |
| Assembly Type | Complete Powershift Unit (3 WG 94) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Primary Material | High-grade cast iron housing with hardened steel gears |
| OEM Reference | ZF 4661.043.026 |
| Seal Type | Viton® O-rings and PTFE lip seals |
Compatibility
This complete unit is engineered specifically for the ZF WG 94 series of powershift transmissions. It is a direct fit for models including the WG180, WG200, and WG211 used in wheel loaders, bulldozers, and material handlers. The assembly also integrates with earlier WG 94 variants where the main housing bolt pattern matches the 0769123894: TYPE PLATE identification. Always verify the serial number on your existing unit against the 4661.043.026 designation before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101036 | HOUSING | Front casing section for gear support |
| 4661301094 | HOUSING | Rear casing section for clutch pack enclosure |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 0750100022 | SCREW PLUG | Oil drain port seal |
| 4660201008 | SCREW PLUG | Pressure test port plug |
| 0636100117 | SCREW PLUG | Filter housing plug |
| 0501211384 | VALVE | Modulation pressure control |
| 0732042156 | COMPRESSION SPRING | Clutch return spring |
| 0768409154 | SCREW PLUG | Lubrication gallery plug |
