ZF 4657.024.303 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4657.024.303 4 WG 190 Powershift Transmission Assembly is a complete, fully assembled unit engineered for heavy-duty off-highway applications. This core assembly integrates the main gear train, clutch packs, and hydraulic control system within a robust housing structure. As a direct replacement for the WG 190 series, the SKU 4657.024.303 ensures seamless integration with existing drivelines, delivering reliable power distribution and smooth shifting under extreme loads. It sits as the central power transfer module between the engine and the final drive, making it critical for operational uptime in construction, mining, and agricultural machinery.

Symptoms of Failure

• Delayed or harsh gear engagement: When the internal clutch packs or valve body wear, operators experience a noticeable lag or jarring shift between forward and reverse gears.
• Transmission fluid contamination: Worn seals or bearing degradation within the assembly often introduce metallic debris into the oil, visible during routine fluid checks.
• Loss of power under load: A failing unit may slip under heavy torque, causing the vehicle to lose traction or speed on inclines or during digging operations.
• External oil seepage at housing joints: Cracks or gasket failures in the TRANSMISSION HOUSING or the HOUS.FRONT SECT can lead to visible drips, reducing fluid levels and accelerating internal wear.

Technical Specifications

Compatibility

This complete unit is specifically designed for the ZF WG 190 series powershift transmissions. It is fully compatible with the WG 180, WG 190, and WG 200 model families, which are commonly found in wheel loaders, telehandlers, and industrial tractors. The assembly also integrates with the HOUSING REAR PART and the HOUSING REAR SECTION for complete rear-end closure. Always verify the specific serial number range of your transmission to ensure a direct fit.

Related Components

Frequently Asked Questions

Q: Is the ZF 4657.024.303 a direct bolt-in replacement for my existing WG 190 transmission?
A: Yes, this complete unit is designed as a direct replacement for the WG 190 series. It includes all internal components pre-assembled, but you should verify your transmission’s serial number and bellhousing pattern to confirm compatibility with your vehicle.

Q: What causes premature failure in this assembly?
A: Common causes include low fluid levels due to leaks from the HOUS.FRONT SECT or HOUSING REAR SECTION, contaminated hydraulic oil, and overloading beyond the 1,900 Nm torque rating. Regular fluid analysis and torque checks can extend service life.

Q: Do I need to replace the housing sections when installing this unit?
A: Not necessarily. The TRANSMISSION HOUSING and related sections should be inspected for cracks or wear. If they are in good condition, they can be reused with new gaskets and seals. However, we recommend replacing the HOUSING REAR PART if it shows any scoring or pitting.