ZF 4657.024.123 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

This ZF 4657.024.123 4 WG 190 Powershift Transmission Assembly is a complete, ready-to-install unit engineered for heavy-duty off-highway applications. As the core assembly within the WG 190 series, it integrates the full gear train, clutch packs, and hydraulic control system to deliver seamless power shifting under load. The SKU 4657.024.123 replaces worn or failed original assemblies, restoring machine performance and reliability. This unit sits directly between the engine flywheel and the final drive, managing torque distribution across four forward and reverse speeds. For a full rebuild, pair this assembly with a new 4657101051: TRANSMISSION HOUSING to ensure structural integrity and precise alignment of internal components.

Symptoms of Failure

• Erratic gear engagement or slipping under load: Worn clutch packs or valve body wear inside the 4657.024.123 cause delayed or incomplete shifts, especially when transitioning from forward to reverse.
• External oil leaks near the bell housing or output flange: Degraded seals and gaskets on this complete unit allow hydraulic fluid to escape, leading to low pressure and eventual transmission failure.
• Unusual grinding or whining noises during operation: Bearing fatigue or gear tooth damage within the assembly produces metallic sounds that intensify with engine RPM.
• Overheating and burnt fluid odor: Internal friction from slipping clutches or blocked oil passages generates excessive heat, often accompanied by a distinct burnt smell from the transmission fluid.

Technical Specifications

Compatibility

This complete unit is specifically designed for the ZF WG 190 series, including the 4 WG 190 variant. It is also compatible with the WG 180 and WG 200 series when used with the appropriate adapter housings. For installations in WG 180 models, verify that the 4657201151: HOUS.FRONT SECT matches your application. For WG 200 applications, the 4657201103: HOUSING REAR PART or the 4472239184: HOUSING REAR PART may be required to complete the assembly. Always cross-reference your original transmission tag before ordering.

Related Components

Frequently Asked Questions

Q: Is the ZF 4657.024.123 a direct bolt-in replacement for the original 4 WG 190 unit?
A: Yes, this complete assembly is manufactured to OEM specifications and bolts directly into the same mounting points. You must transfer your existing HOUS.FRONT SECT and rear housing if they are in good condition, or replace them with new units for optimal sealing.

Q: What is the typical lifespan of this powershift transmission assembly?
A: With proper maintenance and clean fluid, the 4657.024.123 can exceed 8,000 operating hours in construction equipment. Regular replacement of the SCREEN SHEET filters every 500 hours is critical to prevent contamination damage.

Q: Can I install this unit without replacing the housing components?
A: While possible, we strongly recommend inspecting and replacing the TRANSMISSION HOUSING if it shows any cracks or wear at the dowel pin locations. The CYLINDRICAL PIN should always be replaced to maintain alignment tolerances.