ZF 4657.024.057 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4657.024.057 4 WG 190 Powershift Transmission Assembly is a complete, ready-to-install unit engineered for heavy-duty off-highway machinery. This assembly serves as the core power transfer module within the WG 190 series, managing torque distribution across four forward and reverse speeds. Designed for demanding applications such as wheel loaders and graders, the SKU 4657.024.057 integrates the main gear cluster, clutch packs, and hydraulic control valves into a single sealed unit. It mounts directly between the engine bell housing and the final drive, ensuring seamless power delivery under extreme loads. For structural integrity, this assembly pairs with the 4657101045: TRANSMISSION HOUSING, which encloses the rotating components and maintains alignment.

Symptoms of Failure

When the ZF 4657.024.057 assembly begins to degrade, operators typically notice these specific failure indicators:

• Delayed or harsh gear engagement — A common sign of worn clutch discs or degraded hydraulic seals within the unit, causing hesitation when shifting from neutral to forward.
• Torque converter shudder under load — Vibrations during acceleration indicate internal wear on the stator or turbine assembly, often accompanied by rising transmission fluid temperatures.
• External oil seepage from the main case joint — Leaks around the mating surfaces suggest gasket failure or housing distortion, frequently requiring replacement of the 4657201027: HOUS.FRONT SECT to restore sealing.
• Intermittent power loss in higher gears — Slipping in 3rd or 4th gear points to worn planetary gear sets or a failing sprag clutch, necessitating a full assembly swap.

Technical Specifications

Compatibility

This complete assembly is specifically designed for the ZF WG 190 series powershift transmissions. It is directly compatible with the WG 190, WG 190 II, and WG 190 III variants used in construction equipment from 1995 onward. While the unit is not interchangeable with the WG 180 or WG 200 series without major adapter modifications, the internal components share common architecture. The assembly requires the 4657201020: HOUSING REAR PART to complete the rear bearing support, and the 0631306792: CYLINDRICAL PIN for precise alignment during installation. For auxiliary systems, the unit interfaces with the 0750301003: OIL FEED.HOUSG. to supply lubrication to the upper gear train.

Related Components

Frequently Asked Questions

Q: Can the 4657.024.057 assembly be rebuilt, or must it be replaced as a complete unit?
A: While individual clutch packs and seals can be serviced, ZF recommends replacing this assembly as a complete unit due to the precision tolerances between the planetary gear sets and valve body. Rebuilding often requires specialized tooling for bearing preload and clutch clearance adjustments.

Q: What is the typical service life of this transmission assembly in a wheel loader application?
A: Under normal operating conditions with proper fluid maintenance, the 4 WG 190 assembly typically delivers 8,000 to 12,000 hours before major overhaul. Harsh environments with high dust or continuous heavy loading may reduce this interval to 6,000 hours.

Q: Does this assembly include the torque converter, or is that sold separately?
A: The 4657.024.057 is a complete unit that includes the torque converter, all clutch packs, and the hydraulic control valve. However, the external oil feed housing (part 0750301003) and mounting hardware like cap screws (part 0636100801) must be ordered separately if not retained from the old unit.