Overview
The ZF 4143.020.219 2 HL 290 Hydrostatic Drive Assembly is a complete, pre-assembled unit designed for precise power delivery in heavy-duty industrial transmissions. This assembly integrates the hydraulic motor and gear reduction within a single housing, converting hydraulic pressure into mechanical torque for vehicle propulsion. As a core component of the HL 100 and HL 270 series, it directly controls forward and reverse motion in wheel loaders, forklifts, and agricultural machinery. The SKU 4143.020.219 replaces worn or failed units to restore original performance, ensuring seamless integration with your existing drivetrain. When installing this assembly, always inspect the surrounding 4143101046: HOUSING and 4143301055: HOUSING for cracks or wear, as these components work together to maintain internal pressure and alignment.
Symptoms of Failure
- Hydrostatic drive slipping under load: If the assembly loses internal seal integrity, you will notice erratic wheel speed or a complete loss of torque when climbing grades or carrying heavy loads.
- External oil leaks near the drive flange: Worn shaft seals or a damaged 4143298040: CASE can cause hydraulic fluid to weep from the output area, leading to low oil levels and overheating.
- Whining or grinding noise during operation: Contaminated fluid or bearing failure inside the unit produces a high-pitched whine that worsens as the assembly heats up.
- Erratic response to pedal input: A failing hydrostatic unit may cause jerky starts or delayed engagement, often traced to a loose 0631329135: SPRING PIN that controls valve timing.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4143.020.219 |
| Assembly Type | Complete Hydrostatic Drive Unit (2 HL 290) |
| Displacement | 290 cc/rev (estimated) |
| Maximum Operating Pressure | 420 bar (6,090 psi) |
| Input Shaft Diameter | 32 mm (1.26 in) |
| Overall Length | 485 mm (19.1 in) |
| Dry Weight | 68 kg (150 lbs) |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF 4143.020.219 |
| Seal Type | Viton dual-lip |
Compatibility
This hydrostatic drive assembly is engineered for ZF transmissions in the HL 100 and HL 270 series. It directly fits the following models: WG180, WG200, WG210, and WG220. It is also compatible with the 2 HL 290 standalone unit used in telehandlers and compact loaders. For proper sealing during installation, always replace the 0501214034: SEALING CAP and 0636101024: CAP SCREW to prevent contamination. Verify your transmission serial number against the HL series parts list before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101046 | HOUSING | Encloses the gear train and supports bearings |
| 4143301055 | HOUSING | Mounts the hydrostatic motor and valve block |
| 4143298040 | CASE | Outer shell protecting internal rotating components |
| 0631329135 | SPRING PIN | Secures control linkage and prevents backlash |
| 0501214034 | SEALING CAP | Blocks debris from entering the fill port |
| 0636101024 | CAP SCREW | Fastens the housing halves with precise torque |
| 4475280099 | SCREW PLUG | Seals test ports and drain holes |
| 0634303266 | O-RING | Provides static seal between mating surfaces |
| 0501200072 | VENT VALVE | Relieves internal pressure and prevents vacuum |
| 0501217673 | LUBRICATING NIPPLE | Allows grease injection for spline lubrication |
