ZF 4657.024.157 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

This ZF 4657.024.157 4 WG 190 Powershift Transmission Assembly is a complete, ready-to-install unit designed for heavy-duty industrial applications. As a core component of the WG 190 series, this assembly integrates the main gear train, clutch packs, and hydraulic control system into a single, sealed housing. The SKU 4657.024.157 serves as the direct replacement for the original OEM assembly, ensuring precise fitment and restoring full power-shift functionality. It sits at the heart of the drivetrain, transferring engine torque through four forward and reverse speeds without interrupting power flow. For a complete rebuild, this unit is typically paired with a new TRANSMISSION HOUSING to guarantee structural integrity.

Symptoms of Failure

• Delayed or harsh engagement: When the assembly wears, operators notice a significant lag or a jarring clunk when shifting between forward and reverse. This is often the first sign of internal clutch pack wear.
• Torque converter shudder under load: A rhythmic vibration or shudder during acceleration, especially under heavy loads, indicates worn stator bearings or damaged one-way clutches within the assembly.
• External oil leaks at housing seams: Visible fluid drips from the mating surfaces between the HOUS.FRONT SECT and the main body suggest gasket failure or housing distortion, leading to low pressure and slipping.
• Loss of power in higher gears: If the transmission slips out of gear or fails to hold torque in 3rd or 4th gear, the internal sealing rings or piston seals have likely failed, requiring a complete unit replacement.

Technical Specifications

Compatibility

This complete assembly is engineered for the ZF WG 190 series, but it also fits select models in the WG 180 and WG 200 families due to shared bellhousing patterns and input shaft dimensions. It is a direct drop-in replacement for the 4 WG 190 variant. For installations requiring a different rear mount, consider the HOUSING REAR PART or the HOUSING REAR SECTION to adapt the assembly to specific vehicle chassis. Always verify the serial number on your original unit before ordering.

Related Components

Frequently Asked Questions

Q: Is the ZF 4657.024.157 a complete unit with all internal components?
A: Yes, this assembly includes the fully assembled gear train, clutch packs, valve body, and torque converter. It is ready to install after adding fluid and connecting the shift linkage. You do not need to purchase separate internal parts unless you are performing a partial rebuild.

Q: Can I use this assembly with a different rear housing from the WG 200 series?
A: It is possible, but you must verify the bolt pattern and output shaft length. The HOUSING REAR PART (4657201168) is a common swap for adapting to different driveline angles, but we recommend consulting the original equipment manual for your specific vehicle model.

Q: What is the typical lifespan of this assembly before needing a rebuild?
A: In normal industrial service (e.g., forklifts, wheel loaders), this unit typically lasts 8,000 to 12,000 hours. Harsh operating conditions, such as constant heavy loading or poor fluid maintenance, can reduce this to 5,000 hours. Regular oil analysis and filter changes are critical for maximum life.