ZF 4657.024.126 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

This ZF 4657.024.126 4 WG 190 Powershift Transmission Assembly is a complete, factory-engineered unit designed for heavy-duty off-highway applications. As the core power transfer module in the WG 190 series, this assembly integrates the main gear sets, clutch packs, and hydraulic control components into a single, ready-to-install package. The SKU 4657.024.126 replaces the need for individual sub-assembly repairs, providing a direct drop-in solution for machinery requiring uninterrupted uptime. It sits at the heart of the drivetrain, converting engine torque into precisely modulated wheel speed and directional control for loaders, graders, and industrial vehicles.

Symptoms of Failure

• Erratic shifting or gear slippage under load: When the internal clutch packs or valve body wear, the transmission fails to hold pressure, causing the machine to lose power during grading or loading cycles.
• Delayed engagement or harsh directional changes: A failing assembly often produces a noticeable lag when shifting from forward to reverse, followed by a jarring engagement that stresses the driveline.
• External oil leaks from housing seams: Cracks or gasket failures in the main casing allow transmission fluid to escape, leading to low pressure and eventual overheating of the TRANSMISSION HOUSING.
• Unusual whining or grinding noises: Worn bearings or damaged planetary gears produce metallic sounds that intensify with engine RPM, indicating imminent internal failure.

Technical Specifications

Compatibility

This complete unit is engineered specifically for the ZF WG 190 series, including the WG 190, WG 191, and WG 192 variants. It is also mechanically compatible with the WG 180 and WG 200 series when used with the appropriate adapter plates and HOUS.FRONT SECT components. For installations requiring a rear-mounted PTO, the HOUSING REAR PART and HOUSING REAR SECTION must be verified for correct bolt patterns. Always cross-reference your existing unit’s serial number to confirm fitment before ordering.

Related Components

Frequently Asked Questions

Q: Does the 4657.024.126 include the torque converter?
A: No, this is a complete transmission assembly only. The torque converter must be ordered separately if your application requires one. Verify your existing converter’s compatibility with the WG 190 series input spline.

Q: Can I install this unit without replacing the housing sections?
A: Yes, but we strongly recommend inspecting the TRANSMISSION HOUSING for cracks or wear. If the original housing shows any damage, it should be replaced to prevent misalignment of the new assembly.

Q: What is the typical lead time for this complete unit?
A: Lead times vary by stock availability. Most orders ship within 5-7 business days. For urgent requirements, contact our parts specialists to check current inventory levels.