ZF 4143.020.038 2 HL 290 Hydrostatic Drive Assembly | Complete Unit

Overview

The ZF 4143.020.038 2 HL 290 Hydrostatic Drive Assembly is a complete, factory-sealed unit engineered for precise power transfer in heavy-duty mobile machinery. This assembly integrates the pump and motor into a single, robust package, converting engine power into infinitely variable hydraulic drive for ZF transmissions. As a core component of the HL 100 and HL 270 series, it controls vehicle speed and torque without mechanical clutch engagement. The SKU 4143.020.038 is a direct OEM replacement, ensuring exact fitment and hydraulic performance. It works in concert with the 4143101030: HOUSING and the 4143301055: HOUSING to form the sealed hydraulic circuit, while the 4143298040: CASE provides structural rigidity for the entire assembly.

Symptoms of Failure

When the ZF 4143.020.038 hydrostatic drive assembly begins to fail, operators will notice distinct performance degradation. Erratic speed control under load is a primary indicator, where the vehicle surges or fails to maintain a set travel speed during grading or loading operations. External hydraulic oil seepage from the pump-to-motor interface is common, often leaving puddles under the transmission bell housing. A third symptom is excessive whining or grinding noise during direction changes, signaling worn internal pistons or a failing swashplate. Finally, complete loss of drive in one range (forward or reverse) points to internal seal failure or a seized rotating group within the 4143.020.038 unit.

Technical Specifications

Compatibility

This hydrostatic drive assembly is designed for ZF transmissions requiring a compact, high-torque hydraulic drive. It is a direct fit for the WG180 and WG200 series power shift transmissions commonly used in telehandlers and wheel loaders. Additionally, it integrates with the WG150 and WG210 series, where the 4143.020.038 replaces the original pump/motor combination. The unit also serves the HL 270 and HL 100 series, as indicated by its category listing. For proper sealing, the 0631329135: SPRING PIN must be installed to secure the control linkage during assembly.

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