ZF 4657.024.164 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4657.024.164 4 WG 190 Powershift Transmission Assembly is a complete, factory-matched unit engineered for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As the core rotating assembly within the WG 190 series, it manages torque distribution across four forward and reverse speeds. The SKU 4657.024.164 is a direct replacement for worn or failed assemblies, ensuring minimal downtime for loaders, graders, and industrial tractors. This unit interfaces directly with the TRANSMISSION HOUSING to form the sealed driveline envelope.

Symptoms of Failure

• Erratic gear engagement and slipping under load: When the 4657.024.164 assembly wears, internal clutch packs fail to hold torque, causing the machine to lose power during grading or loading cycles.
• Delayed or harsh shifting between ranges: Worn seals or scored drums within the assembly produce a noticeable lag when shifting from forward to reverse, often accompanied by a loud clunk.
• Metallic debris in the transmission oil filter: Advanced wear of gears or bearings sheds ferrous particles, which can be detected during routine oil sampling and indicates imminent internal failure.
• Chronic low oil pressure at the main regulator: Internal leakage past worn pistons or damaged thrust washers prevents the assembly from maintaining adequate hydraulic pressure for clutch application.

Technical Specifications

Compatibility

This complete assembly is specifically designed for the ZF WG 190 series powershift transmissions. It is a direct fit for models including the WG 190, WG 180, and WG 200, which are commonly found in articulated dump trucks, wheel loaders, and heavy forklifts. The unit also shares mounting interfaces with the WG 160 series when used with the correct adaptor plate. For proper installation, the assembly must be paired with the HOUS.FRONT SECT and the HOUSING REAR PART to complete the structural case. In some configurations, the HOUSING REAR SECTION is used as an alternative rear cover for specific output flange arrangements.

Related Components

Frequently Asked Questions

Q: Can the 4657.024.164 assembly be rebuilt, or must it be replaced as a complete unit?
A: While individual clutch packs and seals can be serviced, the complete assembly is balanced and pre-loaded at the factory. For most field repairs, replacing the entire unit with a new 4657.024.164 is recommended to ensure proper shift timing and torque capacity.

Q: What is the typical service life of this powershift assembly in a wheel loader?
A: Under normal operating conditions with proper oil maintenance, the assembly typically lasts 8,000 to 12,000 hours. Harsh applications with frequent direction changes may reduce this interval.

Q: Does this part include the valve body or torque converter?
A: No. The 4657.024.164 is the rotating gear and clutch assembly only. It must be installed with the external valve body, torque converter, and the appropriate housing sections listed in the compatibility table above.