Overview
The ZF 4143.020.067 2 HL 290 Hydrostatic Drive Assembly is a complete, pre-assembled unit designed for demanding mobile machinery applications. This assembly integrates the hydraulic pump and motor into a single, sealed module, converting engine power into infinitely variable hydraulic flow for precise speed and torque control. As a core component within the ZF HL 100 and HL 270 series, this SKU 4143.020.067 replaces the need for separate pump and motor installations, reducing potential leak paths and simplifying service. It is frequently paired with the 4143101032: HOUSING and the 4143301055: HOUSING to form the complete transmission casing.
Symptoms of Failure
When the ZF 4143.020.067 hydrostatic drive assembly begins to fail, operators often notice specific performance declines. Common failure indicators include:
- Hydrostatic drive slipping under load: The machine loses power or speed when pushing or climbing, indicating internal piston or swash plate wear.
- External oil leaks at the drive flange: Oil weeping from the shaft seal or housing joints suggests seal degradation, often requiring replacement of the 4143298040: CASE or its gaskets.
- Excessive noise or whining during operation: A high-pitched whine or grinding sound points to cavitation or bearing failure within the rotating group.
- Erratic or jerky movement: The machine surges or hesitates when the control lever is moved, a sign of worn control spools or damaged valve plates.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4143.020.067 |
| Assembly Type | 2 HL 290 Hydrostatic Drive (Complete Unit) |
| Displacement (estimated) | 90 cc/rev (nominal) |
| Maximum Pressure | 420 bar (6,100 psi) |
| Weight (approx.) | 38 kg (83.8 lbs) |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF Friedrichshafen AG |
| Seal Kit Reference | Includes 0634303266: O-RING |
Compatibility
This complete hydrostatic drive assembly is engineered for ZF’s HL series transmissions, specifically the HL 100 and HL 270 families. It is a direct replacement for units used in the WG180, WG200, and WG210 transmission models found in telehandlers, compact loaders, and agricultural tractors. The assembly mounts directly to the 4143101032: HOUSING and the 4143301055: HOUSING, and is secured using the 0631329135: SPRING PIN for alignment. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101032 | HOUSING | Main transmission casing, supports drive assembly |
| 4143301055 | HOUSING | Secondary housing for hydraulic components |
| 4143298040 | CASE | Encloses the gear train and differential |
| 0631329135 | SPRING PIN | Alignment pin for housing assembly |
| 0501214034 | SEALING CAP | Seals unused hydraulic ports |
| 0636101024 | CAP SCREW | Fastens housing sections together |
| 4475280099 | SCREW PLUG | Closes threaded oil passages |
| 0634303266 | O-RING | Seals fluid connections |
| 4143301045 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 0636420051 | COUNTERSUNK SCREW | Low-profile fastener for internal components |
