ZF 4143.000.173 2 HL 100 Hydrostatic Drive Assembly | Complete Unit

Overview

The ZF 4143.000.173 2 HL 100 Hydrostatic Drive Assembly is a complete, fully assembled unit designed to manage hydraulic power transmission in heavy-duty industrial drivelines. This component serves as the primary hydrostatic motor and gear reduction module within the HL 100 and HL 270 series, converting hydraulic flow into precise mechanical torque for wheel or track drive applications. The SKU 4143.000.173 is a direct OEM replacement unit, ensuring seamless integration with existing ZF systems. It sits between the pump and the final drive, regulating speed and direction under high load conditions.

Symptoms of Failure

• Hydrostatic drive slipping under load: When the internal pistons or valve plate wear, the unit loses pressure, causing erratic or weak motion during operation.
• External oil leaks from the housing: Degraded seals or a cracked 4143101009: HOUSING allow hydraulic fluid to escape, leading to low oil levels and overheating.
• Excessive noise or whining during acceleration: Worn bearings or a misaligned 4143301025: HOUSING create metal-on-metal contact, producing a high-pitched sound.
• Intermittent loss of drive power: A failing 0634313603: O-RING or a loose 4475280018: SCREW PLUG can cause internal pressure drops, resulting in sudden power loss.

Technical Specifications

Compatibility

This complete unit is engineered for the ZF HL 100 and HL 270 series transmissions. It is directly compatible with models including the WG180, WG200, and WG210 series when used in hydrostatic configurations. The assembly also fits select variants of the WG150 and WG250 drivelines that utilize a 2-speed hydrostatic motor. Always verify the housing and mounting interface using the 4143101009: HOUSING and 4143301025: HOUSING for proper alignment.

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