ZF 4657.024.158 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

This ZF 4657.024.158 4 WG 190 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. As the core hydraulic-mechanical assembly in the WG 190 series, it integrates the torque converter, planetary gear sets, and clutch packs into a single ready-to-install package. The SKU 4657.024.158 serves as the direct replacement for worn or failed assemblies in wheel loaders, dozers, and material handlers. It interfaces directly with the TRANSMISSION HOUSING to form the main structural backbone, while the HOUS.FRONT SECT and HOUSING REAR PART enclose the rotating components. This complete unit eliminates the need for piecemeal rebuilding, reducing downtime in critical applications.

Symptoms of Failure

• Delayed or harsh gear engagement: When the internal clutch packs or seals degrade, operators experience a noticeable lag when shifting from neutral to forward or reverse, often accompanied by a jarring engagement.
• Torque converter shudder under load: A rhythmic vibration during acceleration, particularly at low speeds, indicates worn stator or turbine components within the assembly.
• External fluid seepage at housing joints: Oil weeping from the mating surfaces between the main housing and the HOUSING REAR SECTION signals gasket failure or housing distortion.
• Loss of power in higher gears: Slipping in 3rd or 4th gear, often accompanied by elevated transmission oil temperature, points to worn piston seals or damaged friction discs inside the powershift section.

Technical Specifications

Compatibility

This complete unit is engineered for the ZF WG 190 series powershift transmissions. It is a direct fit for models including WG 180, WG 190, and WG 200, commonly found in construction equipment from Volvo, Liebherr, and Caterpillar. The assembly is also compatible with certain WG 170 variants when used with the appropriate adapter plate. Always verify the bell housing pattern against your existing TRANSMISSION HOUSING to ensure proper alignment with the engine flywheel.

Related Components

Frequently Asked Questions

Q: Does this complete unit include the torque converter?
A: Yes, the ZF 4657.024.158 assembly ships as a fully assembled unit with the torque converter, all clutch packs, and valve body installed. No additional internal components are required for installation.

Q: Can I install this assembly without removing the engine?
A: In most wheel loader applications, the transmission can be separated from the engine and removed through the chassis access panel. However, you must first detach the HOUS.FRONT SECT to access the flexplate bolts. Allow a minimum of 8 hours for the swap.

Q: What is the warranty period for this transmission assembly?
A: This complete unit carries a 12-month warranty against manufacturing defects under normal operating conditions. The warranty excludes damage caused by contaminated fluid or improper installation of the HOUSING REAR SECTION seals.