Overview
The ZF 4143.020.174 2 HL 290 Hydrostatic Drive Assembly is a complete, factory-sealed unit engineered for the HL 100 Series and HL 270 Series transmission families. This assembly integrates the hydraulic pump and motor into a single, pre-assembled module, converting engine power into infinitely variable hydrostatic drive for heavy-duty mobile machinery. The SKU 4143.020.174 directly replaces worn or failed assemblies, restoring precise speed control and torque output in wheel loaders, telehandlers, and industrial tractors. It interfaces directly with the main gearbox via the 4143101044: HOUSING and the 4143301055: HOUSING, which together form the structural backbone of the drive system.
Symptoms of Failure
- Erratic machine creep or surging: When the hydrostatic drive assembly loses internal seal integrity, the unit fails to maintain consistent hydraulic pressure, causing the vehicle to lurch or creep unexpectedly during low-speed maneuvers.
- Complete loss of forward or reverse drive: A worn swashplate or damaged piston barrel within the 4143.020.174 can result in zero power transmission, leaving the machine immobile despite engine revs.
- Excessive hydraulic oil foaming or overheating: Internal leakage across the rotating group generates heat and aerates the oil, often accompanied by a distinct whining noise from the transmission case.
- External oil seepage at the pump-to-motor interface: Deteriorated seals around the 4143298040: CASE lead to visible drips, especially after prolonged operation under load.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4143.020.174 |
| Assembly Type | 2 HL 290 Hydrostatic Drive (Complete Unit) |
| Displacement (cm³/rev) | 90 (estimated) |
| Maximum Operating Pressure (bar) | 420 |
| Input Speed Range (RPM) | 1,200 – 2,800 |
| Dry Weight (kg) | 48.5 |
| Housing Material | High-grade cast iron with hardened steel internals |
| Mounting Flange | SAE B 2-bolt (estimated) |
| Seal Type | Viton dual-lip with integrated wiper |
Compatibility
This hydrostatic drive assembly is designed for ZF transmissions in the HL 100 and HL 270 series. It is a direct fit for models including the WG180, WG200, WG210, and WG250. The unit also integrates with earlier 4WG-180 and 4WG-200 series gearboxes. For proper sealing during installation, ensure the 0631329135: SPRING PIN is correctly aligned to lock the drive shaft to the input gear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101044 | HOUSING | Encloses the hydrostatic pump section |
| 4143301055 | HOUSING | Encloses the hydrostatic motor section |
| 4143298040 | CASE | Outer structural shell for the drive assembly |
| 0631329135 | SPRING PIN | Locks shaft alignment during assembly |
| 0501337904 | SPEED SENSOR | Monitors output shaft RPM for control feedback |
| 0636101024 | CAP SCREW | Secures housing halves together |
| 4475280099 | SCREW PLUG | Seals hydraulic test ports |
| 0634303266 | O-RING | Provides static seal between mating flanges |
| 0501200072 | VENT VALVE | Relieves internal case pressure |
| 4475280015 | SCREW PLUG | Closes drain and fill openings |
