Overview
The ZF 4143.020.247 2 HL 290 Hydrostatic Drive Assembly is a complete, high-capacity unit engineered for demanding industrial driveline applications. This assembly integrates the hydraulic motor and gear reduction into a single, sealed module, providing precise variable-speed control and high torque output for ZF transmissions. As a critical component within the HL 100 and HL 270 series, this SKU 4143.020.247 replaces the original hydrostatic unit, restoring full functionality to the transmission’s steering and braking systems. The assembly interfaces directly with the main 4143101046 HOUSING and the 4143301055 HOUSING, ensuring a precise fit and reliable hydraulic sealing.
Symptoms of Failure
When the ZF 4143.020.247 hydrostatic drive assembly begins to fail, operators will notice distinct performance issues. Erratic or jerky steering response is a primary indicator, often caused by internal wear in the swashplate or piston assembly. Another common symptom is audible whining or grinding noise from the transmission housing during low-speed maneuvers, pointing to bearing or gear degradation. External hydraulic oil seepage around the drive unit flange is a clear sign of seal failure, often requiring replacement of the 0631329135 SPRING PIN and associated seals. Finally, loss of hydrostatic braking power or a “neutral creep” condition where the vehicle moves without throttle input indicates internal leakage within the drive assembly.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4143.020.247 |
| Assembly Type | 2 HL 290 Hydrostatic Drive (Complete Unit) |
| Displacement | 28 cc/rev (estimated) |
| Maximum Operating Pressure | 420 bar (6,100 psi) |
| Input Speed Range | 0 – 3,600 RPM |
| Housing Material | High-strength cast iron |
| Dry Weight | 14.5 kg (32.0 lbs) |
| OEM Reference | ZF 4143.020.247 |
| Seal Kit Compatibility | Includes O-ring 0634303266 |
Compatibility
This hydrostatic drive assembly is specifically engineered for ZF transmissions within the HL 100 and HL 270 series families. It is a direct replacement for units used in the WG180, WG200, and WG211 transmission models. The assembly also fits select WG160 and WG250 configurations where the 2 HL 290 pump is specified. Always verify the existing 4143298040 CASE compatibility before installation, as variations in mounting bolt patterns exist between early and late production runs.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101046 | HOUSING | Main transmission housing, supports drive assembly |
| 4143301055 | HOUSING | Secondary housing for hydraulic manifold |
| 4143298040 | CASE | Outer casing for gear reduction set |
| 0631329135 | SPRING PIN | Locating pin for drive assembly alignment |
| 0501214034 | SEALING CAP | Protects hydraulic ports during service |
| 0636101024 | CAP SCREW | Mounting fastener for drive unit |
| 4475280099 | SCREW PLUG | Seals test ports on the housing |
| 0634303266 | O-RING | Hydraulic seal between mating surfaces |
| 0501200072 | VENT VALVE | Relieves internal housing pressure |
| 0501217673 | LUBRICATING NIPPLE | Grease fitting for drive shaft bearing |
