ZF 4657.024.124 4 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

This complete ZF 4657.024.124 4 WG 190 Powershift Transmission Assembly is a fully integrated unit designed for heavy-duty off-highway machinery. As the core power transfer module in the WG 190 series, this assembly manages torque distribution across four forward and reverse speeds, enabling precise vehicle control under extreme loads. The SKU 4657.024.124 replaces the entire gear train and clutch pack assembly, making it a direct drop-in solution for overhauling a worn transmission. It sits between the engine bellhousing and the final drive, connecting directly to the TRANSMISSION HOUSING and the HOUS.FRONT SECT to form a sealed, pressurized oil circuit.

Symptoms of Failure

• Erratic gear engagement under load: When the assembly wears, internal clutch packs slip, causing delayed or harsh shifts during grading or dozing operations.
• Torque converter shudder at low RPM: Worn stator bearings or damaged planetary gears produce a distinct vibration when creeping forward, often misdiagnosed as engine misfire.
• Hydraulic oil contamination with metallic debris: Failing thrust washers or gear teeth shed particles that clog the SCREEN SHEET (4657301032) and reduce line pressure.
• External oil seepage from the rear adapter: Cracks in the HOUSING REAR PART (4657201103) allow ATF to leak onto the driveline, leading to low fluid levels and eventual transmission failure.

Technical Specifications

Compatibility

This complete assembly is engineered for the ZF WG 190 series, specifically the 4-speed variant (4 WG 190). It is backward-compatible with earlier WG 180 models when used with the HOUSING REAR PART (4472239184) adapter kit. It also fits WG 200 series transmissions after 2012, provided the SCREEN SHEET (4657301033) is upgraded. Common applications include ZF 4 WG 190, 4 WG 180, and 4 WG 200 powershift units found in loaders, graders, and dump trucks.

Related Components

Frequently Asked Questions

Q: Can the 4657.024.124 be installed without replacing the housing sections?
A: Yes, but we strongly recommend inspecting the TRANSMISSION HOUSING and both rear housing parts for cracks or wear before reusing them, as misalignment can damage the new assembly.

Q: What is the typical service life of this complete unit?
A: Under normal operating conditions with proper oil changes, the 4 WG 190 assembly lasts 8,000–12,000 hours. Failure often begins with debris clogging the SCREEN SHEET (4657301032), so replace that filter during installation.

Q: Does this assembly include the fixing plate and cap screws?
A: No, the 4657.024.124 is the core gear and clutch unit only. You will need to order the FIXING PLATE (4656301148) and CAP SCREW (0636100801) separately for a complete rebuild.