ZF 4657.024.051 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

This complete ZF 4657.024.051 4 WG 190 Powershift Transmission Assembly is a fully integrated unit designed for heavy-duty off-highway applications. As the core of the WG 190 series, this assembly manages torque distribution and gear engagement under extreme loads. The SKU 4657.024.051 represents a complete drop-in replacement that includes the main gear cluster, clutch packs, and hydraulic control components. It sits directly between the engine bell housing and the output driveline, serving as the primary power transfer module. For proper installation, this assembly mates with the TRANSMISSION HOUSING which provides structural support, while the HOUS.FRONT SECT and HOUSING REAR PART enclose the rotating assembly.

Symptoms of Failure

• Erratic gear engagement under load: When the 4 WG 190 assembly wears, operators experience delayed or harsh shifting during grading or dozing operations, often accompanied by a metallic grinding noise.
• Internal hydraulic pressure loss: A failing unit will show low clutch pack pressure readings, leading to torque converter overheating and reduced machine pulling power.
• Visible oil seepage at mating flanges: Worn seals within the assembly cause transmission fluid to leak from the joint between the housing sections, often requiring replacement of the CYLINDRICAL PIN which aligns the housing halves.
• Intermittent neutral condition: A worn powershift unit may suddenly drop into neutral during forward/reverse direction changes, indicating internal clutch drum or piston failure.

Technical Specifications

Compatibility

This complete assembly is engineered specifically for the ZF WG 190 series powershift transmissions. It is directly compatible with WG 190 models used in wheel loaders, graders, and compactors from manufacturers such as Volvo, Case, and Caterpillar. While primarily designed for the WG 190, the 4657.024.051 unit shares mounting patterns with the WG 180 and WG 200 series, though internal gear ratios differ. Always verify bell housing alignment using the CAP SCREW specifications for proper torque settings.

Related Components

Frequently Asked Questions

Q: Can the 4657.024.051 assembly be rebuilt, or must it be replaced as a complete unit?
A: While individual internal components like clutch discs and seals are serviceable, the 4 WG 190 assembly is typically replaced as a complete unit due to the precision alignment required. We recommend replacing the FIXING PLATE and all CAP SCREW fasteners during any rebuild.

Q: What is the expected service life of this powershift transmission assembly?
A: Under normal operating conditions with proper maintenance, the ZF 4657.024.051 unit typically lasts 8,000 to 12,000 hours. Regular replacement of the SCREEN SHEET filters and OIL FEED.HOUSG. components can extend this lifespan significantly.

Q: Does this assembly include the torque converter?
A: No, the 4657.024.051 is the transmission gearbox section only. The torque converter is a separate component that mounts to the HOUS.FRONT SECT via the input shaft.