ZF 4661.002.017 4 WG 90 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4661.002.017 4 WG 90 Powershift Transmission Assembly is a complete, factory-grade unit designed for heavy-duty off-highway machinery. This assembly serves as the central power distribution hub within the WG 90 series, managing torque flow across four forward and reverse speeds. The SKU 4661.002.017 integrates directly with the TRANSMISSION HOUSING and the HOUSING II to form a sealed, high-pressure oil circuit. As a complete unit, it eliminates the need for partial rebuilds, offering a drop-in replacement for worn or failed assemblies in loaders, graders, and material handlers.

Symptoms of Failure

• Erratic gear engagement or slipping under load: When the internal clutch packs or valve body wear, the assembly fails to maintain consistent hydraulic pressure, causing the machine to hesitate or lose power during operation.
• External oil seepage at housing joints: Degraded seals between the main body and the CYLINDRICAL PIN or tube interfaces lead to visible fluid leaks, often mistaken for simple gasket failures.
• Delayed shift response or harsh shifting: Contaminated oil or worn spools within the assembly create lag between gear changes, accompanied by audible clunks or jarring motions.
• Overheating transmission fluid: Internal friction from damaged components generates excess heat, triggering warning lights or burnt oil odors.

Technical Specifications

Compatibility

This complete unit is engineered for the ZF WG 90 series powershift transmissions. It is directly compatible with models including WG90, WG120, and WG150 used in telehandlers, compact wheel loaders, and backhoe loaders. The assembly also fits select variants of the WG180 and WG200 when paired with the correct TUBE and hydraulic adapter kit. Always verify your transmission serial number against the OEM cross-reference before installation.

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