ZF 4143.020.107 2 HL 290 Hydrostatic Drive Assembly | Complete Unit

Overview

The ZF 4143.020.107 2 HL 290 Hydrostatic Drive Assembly is a complete, pre-assembled unit designed for the HL 100 and HL 270 series transmissions. This assembly integrates the variable-displacement pump and motor into a single, sealed housing, converting hydraulic pressure into precise mechanical torque for wheel or track drive. As a direct OEM replacement, the SKU 4143.020.107 ensures exact fitment and restores full hydrostatic performance in ZF drivelines. It is typically mounted between the main gearbox and the final drive, where it manages infinitely variable speed control under heavy loads.

Symptoms of Failure

When the ZF 4143.020.107 hydrostatic drive assembly begins to fail, operators often notice erratic speed control under load, where the machine surges or fails to maintain a constant travel speed. Another common symptom is excessive hydraulic oil foaming or overheating, indicating internal bypassing or worn pistons inside the unit. You may also detect audible whining or grinding noises from the drive assembly during acceleration or deceleration. Finally, visible oil seepage around the housing seams suggests seal degradation, often requiring replacement of the adjacent 4143101030: HOUSING or 4143301055: HOUSING to prevent contamination.

Technical Specifications

Compatibility

This hydrostatic drive assembly is engineered for ZF transmissions in the HL 100 and HL 270 series, including models such as the WG180, WG200, and WG250. It also fits select WG160 and WG300 configurations where the 2 HL 290 pump-motor unit is specified. The assembly is commonly used in telehandlers, compact loaders, and agricultural sprayers. For proper installation, ensure the 4143298040: CASE is free of debris, and secure the unit using the 0631329135: SPRING PIN for alignment.

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