Overview
The ZF 4143.020.043 2 HL 270 Hydrostatic Drive Assembly is a complete, factory-sealed unit engineered for precise power transmission in heavy-duty industrial drivelines. This assembly integrates the hydrostatic motor and gear reduction components into a single, robust package, serving as the core propulsion element within the ZF HL 270 series. The SKU 4143.020.043 denotes a fully assembled unit, eliminating the need for separate component matching. It directly interfaces with the vehicle’s hydraulic system to convert fluid pressure into mechanical torque, enabling smooth, variable-speed operation for wheel loaders, telehandlers, and other off-highway machinery. This assembly is commonly paired with the 4143101032: HOUSING and the 4143301055: HOUSING to form the complete transmission casing.
Symptoms of Failure
When the ZF 4143.020.043 hydrostatic drive assembly begins to degrade, operators will notice distinct performance issues. Loss of tractive effort during low-speed maneuvering is a primary indicator, often accompanied by a whining noise from the driveline. Intermittent or complete loss of forward/reverse drive under load suggests internal piston or swash plate wear. External oil seepage around the output shaft seal is common, leading to low fluid levels and eventual overheating. Additionally, jerky or surging motion during acceleration points to contamination or scoring within the rotating group. If the 4143298040: CASE shows signs of stress, inspect the 0631329135: SPRING PIN for shearing, as this pin secures critical alignment.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4143.020.043 |
| Assembly Type | 2 HL 270 Hydrostatic Drive (Complete Unit) |
| Maximum Displacement | 270 cc/rev (estimated) |
| Rated Input Speed | 2,800 RPM (continuous) |
| Maximum Operating Pressure | 420 bar (6,100 psi) |
| Dry Weight | Approx. 85 kg (187 lbs) |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF Friedrichshafen AG |
| Seal Kit Compatibility | Includes 0634303266: O-RING |
Compatibility
This hydrostatic drive assembly is designed for ZF’s HL 100 and HL 270 series transmissions. It is a direct fit for models including the WG180, WG200, and WG210 power shift transmissions when configured with hydrostatic input drives. It also integrates with the 4WG-200 and 4WG-210 series used in mid-size wheel loaders. The unit replaces earlier 2 HL 250 variants and is backward-compatible with many ZF drivelines requiring a 270 cc displacement motor. Always verify the 0501214034: SEALING CAP and 0636101024: CAP SCREW are present during installation to prevent contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101032 | HOUSING | Main transmission casing, supports gear train |
| 4143301055 | HOUSING | Secondary housing for hydrostatic motor mount |
| 4143298040 | CASE | Outer protective shell for drive assembly |
| 0631329135 | SPRING PIN | Locks housing alignment during operation |
| 0501214034 | SEALING CAP | Prevents fluid loss from unused ports |
| 0636101024 | CAP SCREW | Secures housing flanges to transmission |
| 4475280099 | SCREW PLUG | Closes hydraulic test points |
| 0634303266 | O-RING | Seals mating surfaces against leaks |
| 4143301045 | SCREEN SHEET | Filters debris from hydraulic return flow |
| 0636420051 | COUNTERSUNK SCREW | Fastens screen sheet to housing |
