ZF 4657.026.108 6 WG 190 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4657.026.108 6 WG 190 Powershift Transmission Assembly represents a complete, factory-grade replacement unit designed for heavy-duty off-highway machinery. This fully assembled gearbox integrates the main drive train, clutch packs, and hydraulic control system into a single, ready-to-install package. As a core component of the WG 190 Series, this SKU 4657.026.108 unit sits directly between the engine flywheel housing and the final drive axle, managing torque distribution across six forward speeds. For a full rebuild, the 4657101080: TRANSMISSION HOUSING provides the structural foundation, while the 4657201167: HOUS.FRONT SECT seals the forward clutch assembly.

Symptoms of Failure

• Delayed engagement or gear slipping under load: When the internal clutch discs wear, the transmission hesitates before moving or loses torque during uphill operation.
• External oil leaks near the bell housing: Degraded seals around the input shaft cause visible hydraulic fluid drips, often mistaken for engine oil leaks.
• Erratic shifting or harsh engagement: Worn valve body components lead to sudden, jarring gear changes instead of smooth power transitions.
• Overheating during extended operation: Blocked internal oil passages reduce cooling efficiency, triggering thermal warnings in the cab.

Technical Specifications

Compatibility

This complete unit is engineered specifically for the ZF WG 190 Series powershift transmissions. It is directly compatible with WG 180, WG 190, and WG 200 models used in telehandlers, wheel loaders, and agricultural tractors. The assembly also interfaces with the 4657201171: HOUSING REAR PART and the 4657298103: HOUSING REAR SECTION for complete rear-end sealing. For specific vehicle applications, always verify the serial number against your existing transmission tag.

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