ZF 4657.024.019 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

This ZF 4657.024.019 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, it integrates the torque converter, planetary gear sets, and clutch packs into a single sealed system. The SKU 4657.024.019 serves as the primary power transfer module in the WG 190 series, converting engine torque into controlled, multi-speed output for wheel loaders, graders, and material handlers. This complete unit eliminates the need for piecemeal rebuilding, ensuring precise alignment of internal components such as the TRANSMISSION HOUSING and the HOUS.FRONT SECT for optimal oil flow and gear engagement.

Symptoms of Failure

• Delayed or harsh directional shifts: When the internal clutch packs or valve body wear, operators experience a noticeable lag when shifting from forward to reverse, often accompanied by a jarring engagement.
• Torque converter shudder under load: A vibration or “chatter” during acceleration, particularly in 2nd and 3rd gear, indicates failing stator bearings or worn friction discs within the assembly.
• External oil seepage at housing seams: Leaks originating from the joint between the HOUSING REAR PART and the main case suggest compromised gaskets or cracks, leading to low hydraulic pressure and eventual gear slipping.
• Erratic neutral or creeping: A transmission that fails to fully disengage in neutral, causing the machine to creep, points to internal seal failures or a stuck CYLINDRICAL PIN in the shift rail mechanism.

Technical Specifications

Compatibility

This complete unit is engineered specifically for the ZF WG 190 series. It is directly interchangeable with transmissions in the WG 180, WG 190, and WG 200 families that share the same bellhousing pattern and input shaft spline count. Common applications include ZF 4WG-180, 4WG-190, and 4WG-200 powershift models used in Volvo L90/L120 loaders, Caterpillar 924/928 machines, and certain Terex and JCB telehandlers. Always verify the serial number range against your existing TRANSMISSION HOUSING casting marks to confirm fitment.

Related Components

Frequently Asked Questions

Q: Is this a complete drop-in replacement for a ZF 4WG-190?
A: Yes, the 4657.024.019 is a fully assembled unit including the torque converter, valve body, and all internal clutches. It mounts directly to the engine flywheel housing and requires no internal modifications.

Q: What oil type does this assembly require?
A: ZF specifies Dexron III or equivalent ATF. The unit holds approximately 22 liters. Always replace the SCREEN SHEET filters during installation to prevent debris contamination.

Q: Can I reuse my old HOUS.FRONT SECT with this new assembly?
A: We recommend replacing the complete unit to ensure matched wear tolerances. However, if your front section is undamaged, it can be swapped using new CYLINDRICAL PIN alignment dowels and gaskets.