Overview
The ZF 4143.000.162 2 HL 100 Hydrostatic Drive Assembly is a complete, factory-sealed unit designed to manage variable-speed power delivery in heavy-duty mobile machinery. This assembly integrates the pump and motor within a single housing, converting engine torque into smooth, infinitely variable hydraulic output for precise vehicle control. As a core component of the HL 100 and HL 270 series, it sits directly between the prime mover and the final drive, eliminating the need for a traditional mechanical clutch. The SKU 4143.000.162 is a direct OEM replacement, ensuring exact fitment and original performance specifications for ZF drivelines.
Symptoms of Failure
- Hydrostatic drive slipping under load: If the unit fails to maintain consistent pressure, you may notice a loss of traction or speed when the machine is under heavy load, often accompanied by a whining noise from the pump section.
- External oil leaks from housing joints: Worn seals or a cracked 4143101009: HOUSING can cause hydraulic fluid to weep around the mating surfaces, leading to low oil levels and eventual system cavitation.
- Erratic or jerky motion during acceleration: Internal wear in the swashplate or piston assembly can cause hesitation or sudden lurching, particularly when transitioning from neutral to forward or reverse.
- Overheating of the transmission fluid: A failing hydrostatic unit generates excessive heat due to internal bypassing, which can trigger thermal alarms or cause the oil to darken and smell burnt.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4143.000.162 |
| Assembly Type | Complete Hydrostatic Drive (2 HL 100) |
| Displacement | 100 cc/rev (nominal) |
| Maximum Pressure | 420 bar (6,090 psi) |
| Weight | Approx. 85 kg (187 lbs) |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF 4143.000.162 |
| Seal Type | Viton O-rings (requires 0634313603: O-RING) |
| Mounting | Flange-mounted with 4475280018: SCREW PLUG ports |
Compatibility
This hydrostatic drive assembly is engineered for ZF transmissions that require independent hydraulic power for auxiliary functions or steer-by-wire systems. It is a direct fit for the WG180, WG200, and WG210 series transmissions commonly used in telehandlers and compact loaders. Additionally, it integrates with the HL 100 and HL 270 series final drives. For proper sealing during installation, always pair this unit with a new 4143301025: HOUSING gasket and the correct O-rings to prevent contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Encloses the rotating group; provides fluid passages |
| 4143301025 | HOUSING | Secondary housing for charge pump section |
| 0634313603 | O-RING | Seals the high-pressure port interface |
| 4475280018 | SCREW PLUG | Closes test ports and drain holes |
| 0501342341 | SUPPORT RING | Prevents O-ring extrusion under high pressure |
| 4143298457 | SEAL KIT | Complete set of gaskets and O-rings for overhaul |
| 0634313591 | O-RING | Seals the suction line connection |
| 0636101068 | CAP SCREW | Secures the housing halves together |
| 4143221013 | THROTTLE VALVE | Controls flow rate for smooth engagement |
| 0634304484 | O-RING | Seals the throttle valve bore |
