ZF 4661.003.009 4 WG 94 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4661.003.009 4 WG 94 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single ready-to-install package. As a core element of the WG 94 Series, it governs torque distribution and gear ratio selection under load. The SKU 4661.003.009 identifies this as a fully assembled powershift unit, replacing multiple individual subcomponents. It interfaces directly with the TRANSMISSION HOUSING to form the primary structural shell, while the HOUSING II encloses the rear clutch drum assembly. Proper alignment is ensured by the CYLINDRICAL PIN, which indexes the unit to the bell housing.

Symptoms of Failure

• Delayed or harsh engagement – When the assembly loses internal seal integrity, hydraulic pressure drops, causing a noticeable lag when shifting from neutral to forward or reverse.
• Torque converter shudder – Worn clutch plates within the unit produce a vibration under moderate acceleration, often misdiagnosed as a driveline issue.
• External oil seepage at the housing joint – Degraded gaskets or micro-cracks in the assembly allow ATF to weep from the seam between the unit and the TUBE.
• Intermittent gear slip under load – As friction material wears, the transmission fails to hold torque, particularly when climbing grades or pushing heavy loads.

Technical Specifications

Compatibility

This complete unit is engineered for the ZF WG 94 transmission family, which includes the WG180, WG200, and WG210 models commonly found in telehandlers, wheel loaders, and industrial tractors. It is a direct replacement for earlier 4 WG 94 variants used in Liebherr, Manitou, and JCB equipment. The assembly is not compatible with the 3-speed WG 92 series or the heavy-duty WG 120 series without significant adapter modifications.

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