ZF 4657.026.124 6 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4657.026.124 6 WG 190 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the full gear train, clutch packs, and hydraulic control system within a single housing, serving as the central power distribution module for wheel loaders, graders, and industrial vehicles. The SKU 4657.026.124 represents the fully assembled 6-speed forward / 3-speed reverse configuration, ensuring direct bolt-in replacement without the need for internal component matching. It sits between the torque converter and the final drive, managing torque flow through planetary gear sets. For structural integrity, this unit mates with the 4657101080: TRANSMISSION HOUSING, which provides the main casing, while the 4657201167: HOUS.FRONT SECT and 4657201171: HOUSING REAR PART enclose the forward and aft sections of the gear train.

Symptoms of Failure

• Erratic gear engagement or slipping under load — Worn clutch packs or hydraulic seal degradation inside the assembly cause delayed shifts or loss of torque during operation, often accompanied by a burning oil smell.
• External oil leaks at housing joints — Cracks or gasket failure in the main casing, particularly where the 4657298103: HOUSING REAR SECTION seals, lead to progressive fluid loss and eventual transmission starvation.
• Abnormal whining or grinding noises — Bearing wear or planetary gear damage within the 6 WG 190 produces metallic sounds that intensify with speed changes, indicating imminent internal failure.
• Inability to shift into specific gears — Hydraulic valve body malfunctions or broken shift forks prevent engagement of forward or reverse ranges, often requiring complete assembly replacement.

Technical Specifications

Compatibility

This complete unit is specifically engineered for the ZF WG 190 series powershift transmissions. It is directly compatible with WG 180, WG 190, and WG 200 models used in construction and agricultural equipment. The assembly also fits select variants of the WG 170 series when paired with the correct torque converter. Always verify the bell housing pattern and input shaft spline count against your existing unit before ordering.

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