Overview
The ZF 4642.054.026 4 WG 150 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the planetary gear set, clutch packs, and hydraulic control system into a single, ready-to-install package. As the core power transfer module in the WG 150 series, it replaces the entire internal rotating assembly. The SKU 4642.054.026 is the direct OEM reference for this complete unit, ensuring a precise fit without modification. It sits between the torque converter and the output flange, managing all gear ratio changes under load.
Symptoms of Failure
- Erratic shifting under load: When the internal clutch packs wear, the transmission may hesitate or slam into gear, particularly when moving heavy material. This is a common long-tail search query for “ZF WG 150 hard shifting.”
- Loss of forward or reverse drive: A complete unit failure often presents as a total loss of motion in one direction, caused by a seized planetary carrier or broken piston seals within the assembly.
- Contaminated transmission fluid with metallic debris: Worn bearings or friction discs shed metal particles. If you find glitter in the oil, the 4642.054.026 assembly likely requires immediate replacement.
- Hydraulic pressure drop at the shift valve: Internal leakage past worn seals prevents the transmission from building adequate pressure, leading to clutch slip and overheating.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4642.054.026 |
| Assembly Type | Complete Powershift Unit (4 WG 150) |
| Dry Weight (approx.) | 145 kg (320 lbs) |
| Overall Length | 620 mm |
| Housing Diameter | 410 mm |
| Material | Cast Iron Housing / Hardened Steel Gears |
| OEM Reference | ZF 4642.054.026 |
| Bolt Torque (housing) | 120 Nm |
Compatibility
This complete unit is specifically engineered for the ZF WG 150 transmission series. It is also compatible with the WG 180 and WG 200 series when used with the correct adapter housing, though the internal gear ratios are optimized for the WG 150. It fits models including the 4 WG 150, 5 WG 150, and 6 WG 150 used in loaders, graders, and forklifts. Always verify the serial number on your existing TRANSMISSION HOUSING (part 4642101109) or the TRANSMISSION HOUSING (part 4642301205) to confirm compatibility before installation.
During installation, ensure the TYPE PLATE (part 0730365125) is transferred to the new assembly for correct identification. The GROOVED STUD (part 0631311009) must be reused to secure the shift valve body to the housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses the gear set and supports bearings |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG 150 series |
| 0730365125 | TYPE PLATE | Identification tag with serial number |
| 0631311009 | GROOVED STUD | Locating pin for valve body alignment |
| 4642301168 | SCREEN SHEET | Fine mesh filter for oil return line |
| 4642301169 | SCREEN SHEET | Coarse mesh filter for suction line |
| 0636100621 | HEXAGON SCREW | M12 bolt for housing flange |
| 4642301186 | SCREEN SHEET | Filter for lubrication circuit |
| 4644106300 | SHIFT SYSTEM | Hydraulic valve assembly for gear selection |
| 4644306500 | COVER PLATE | Seals the rear of the transmission housing |
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