ZF 4657.024.174 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

This ZF 4657.024.174 4 WG 190 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. 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 4657.024.174 replaces the need for individual sub-assembly sourcing, ensuring correct gear ratios and hydraulic pressure calibration for loader, dozer, and forklift drivelines. This assembly sits directly between the engine flywheel housing and the final drive, transferring power through four forward and three reverse speeds. For structural integrity, this unit mates with the 4657101078: TRANSMISSION HOUSING which provides the main casing, while the 4657201166: HOUS.FRONT SECT supports the front bearing cluster.

Symptoms of Failure

• Delayed engagement or gear slipping under load: Worn clutch piston seals or degraded friction discs inside the 4 WG 190 cause the transmission to hesitate before moving or to lose torque when pushing heavy material.
• Hydraulic oil leaks from the bell housing area: Cracks in the main casing or failed gaskets around the 4657201168: HOUSING REAR PART allow ATF to weep onto the ground, leading to low pressure and eventual clutch burn.
• Erratic shifting or harsh engagement: A failing torque converter stator or worn valve body spools cause the transmission to slam into gear or refuse to upshift, often accompanied by a loud clunk.
• Overheating during extended operation: Internal debris from a failing bearing or a blocked screen sheet restricts oil flow, causing the transmission to run above 120°C and triggering thermal shutdown.

Technical Specifications

Compatibility

This complete unit is specifically engineered for the ZF WG 190 series powershift transmissions. It is a direct fit for the 4 WG 190 variant used in wheel loaders, telehandlers, and industrial tractors from manufacturers such as Liebherr, JCB, and Caterpillar (certain models). While the primary application is the WG 190, the assembly shares mounting patterns with the WG 180 and WG 200 series, though internal gear ratios differ. The 4657298101: HOUSING REAR SECTION is a critical match for this unit, as it houses the output shaft bearing and PTO drive. Always verify your transmission serial number against the 4657.024.174 casting code before installation.

Related Components

Frequently Asked Questions

Q: Can the ZF 4657.024.174 be installed without replacing the housing sections?
A: It is strongly recommended to inspect and replace the TRANSMISSION HOUSING and HOUS.FRONT SECT if they show any cracks or bore wear, as mismatched housings can cause misalignment and premature failure of the new assembly.

Q: What is the typical lifespan of this complete unit in a wheel loader?
A: Under normal operating conditions with proper maintenance (oil changes every 1,000 hours), the 4 WG 190 assembly can last 8,000 to 12,000 hours before requiring a rebuild. Overheating or contamination from a failed SCREEN SHEET will significantly reduce this lifespan.

Q: Does this unit include the torque converter?
A: Yes, the 4657.024.174 is a complete assembly that includes the torque converter, all planetary gear sets, clutch packs, and the valve body. You will need to transfer the FIXING PLATE and CAP SCREW from your old unit if they are not included in the shipment.