ZF 4661.002.014 4 WG 90 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4661.002.014 4 WG 90 Powershift Transmission Assembly is a complete, factory-grade replacement unit designed for heavy-duty off-highway applications. This assembly integrates the full gear train, clutch packs, and hydraulic control system into a single, ready-to-install package. As the core of the WG 90 series, it manages torque distribution across four forward and reverse speeds, ensuring smooth power delivery under extreme loads. The SKU 4661.002.014 is a direct OEM-spec unit, eliminating the need for partial rebuilds. When installing this assembly, it is critical to pair it with a properly sealed TRANSMISSION HOUSING to maintain structural integrity and oil flow paths.

Symptoms of Failure

• Erratic gear engagement or slipping under load: Worn clutch discs or valve body wear inside the 4661.002.014 cause delayed shifts or complete loss of drive in specific ranges.
• Internal hydraulic pressure loss: Cracks in the assembly housing or failed seals lead to low line pressure, resulting in sluggish operation and overheating.
• Metallic debris in transmission fluid: Bearing or gear spalling generates visible metal particles, often accompanied by whining noises during acceleration.
• External oil seepage at mating surfaces: Damaged gaskets between the assembly and the HOUSING II create visible drips, particularly after prolonged operation.

Technical Specifications

Compatibility

This complete unit is engineered for the ZF WG 90 series powershift transmissions. It is directly compatible with models including the WG 90, WG 120, and WG 150 when used in telehandlers, wheel loaders, and industrial tractors. For proper oil routing, always install the TUBE (lubrication line) between the assembly and the cooler circuit. Secure the unit using the CYLINDRICAL PIN for precise alignment during installation.

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