Overview
The ZF 4642.056.026 6 WG 150 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This fully assembled gearbox integrates the main drive housing, clutch packs, and hydraulic control circuits into a single drop-in replacement. The SKU 4642.056.026 corresponds to a 6-speed forward, 1-reverse configuration within the WG 150 series, providing seamless power shifting under load. It sits as the central driveline component between the engine bellhousing and the output flange, managing torque distribution across all gear ranges. For a full rebuild, this assembly mates directly with the TRANSMISSION HOUSING (4642101109) and the TRANSMISSION HOUSING (4642301205), which form the structural backbone of the unit.
Symptoms of Failure
- Delayed or harsh engagement: When the 4642.056.026 assembly wears, hydraulic pressure drops, causing a 2-3 second lag before the transmission engages forward or reverse. Operators often report a “clunk” upon shifting.
- Intermittent gear slipping under load: Worn clutch discs inside the unit lead to RPM flare without corresponding vehicle speed increase, especially on inclines or during heavy digging cycles.
- External oil seepage at housing seams: Fatigue cracks or gasket failure in the main assembly allow ATF to weep from the bellhousing area, leaving visible drips on the undercarriage after shutdown.
- Loss of directional control: A failing shift valve body within the assembly can cause the machine to creep forward when reverse is selected, or fail to hold park lock on grades.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4642.056.026 |
| Series | WG 150 (6 WG 150) |
| Gear Configuration | 6 Forward / 1 Reverse |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 480 mm |
| Housing Material | Cast Iron (GGG-40) |
| Max Input Torque | 1,200 Nm |
| Oil Capacity | 18.5 liters |
| Identification | Includes TYPE PLATE (0730365125) |
Compatibility
This complete assembly is engineered for the ZF WG 150 series, but its core architecture is shared across the WG family. It is a direct fit for WG 150 models used in telescopic handlers, wheel loaders, and forklifts from 8 to 14 tons. The unit is also mechanically compatible with WG 180 and WG 200 series when paired with the correct adapter housings. The GROOVED STUD (0631311009) is required for mounting the assembly to the engine flywheel housing. For filter and screen maintenance, the assembly accepts the SCREEN SHEET (4642301168) and SCREEN SHEET (4642301169) in the suction circuit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301205 | TRANSMISSION HOUSING | Rear housing section for output shaft |
| 0730365125 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Engine-to-transmission mounting fastener |
| 4642301168 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Coarse mesh pre-filter for oil sump |
| 0636100621 | HEXAGON SCREW | M16 bolt for housing flange assembly |
| 4642301186 | SCREEN SHEET | Secondary filter for clutch lubrication |
| 4644106300 | SHIFT SYSTEM | Electro-hydraulic valve body assembly |
| 4644306500 | COVER PLATE | Access cover for shift system inspection |
