HL-A4VTG HYDRAULIC PUMPS
Variable Displacement Axial Piston Pump for Closed Circuit

Variable Displacement Axial Piston Pump for Closed Circuit

The HL-A4VTG variable displacement pump is designed for high efficiency, precise control, and powerful pressure output in closed-loop hydraulic systems. It is ideal for applications requiring dynamic response and high-load operation in construction and industrial equipment.

  • Displacement 71/90 cm³/rev
  • Nominal pressure 400 bar
  • Max. allowable pressure 450 bar
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Technical Data
Size 71 90
Displacement Variable pump Vgmax cm³/rev 71 90
Auxiliary pump (at p=20 bar) cm³/rev 19.8 28
Rotation speed Max. speed rpm 3300 3050
Min. speed rpm 500 500
Flow at n=nmax L/min 234.3 274.5
Power at nmax Δp=400 bar kW 156.2 183
Torque at nmax Δp=400 bar Nm 451.5 572.4
Weight kg 48 50
Features
  • Engineered for Mobile Equipment Designed specifically for hydrostatic transmissions in heavy-duty machinery.
  • Axial Piston Variable Displacement Pump Uses a swashplate mechanism for precise flow control.
  • Flow Proportional to Speed and Displacement Delivers smooth and stable hydraulic output.
  • Infinitely Adjustable Displacement Swashplate angle allows seamless variable adjustment.
  • Smooth Flow Reversal Transition through zero is steady, preventing pressure spikes.
  • High-Pressure Protection Dual relief valves safeguard hydraulic components from overload.
  • Integrated Auxiliary Pump Provides boost pressure and control oil to maintain system stability.
  • Boost Pressure Limiting Valve Built-in relief valve prevents excessive boost pressure.
  • High-Precision Bearings Designed for extended service life under demanding conditions.
  • Reliable Sealing System PARKER sealing components ensure durability and prevent leakage.
  • Control Mode HW, EP
Applications
Mixer Trucks
Mixer Trucks
Agricultural Machinery
Agricultural Machinery
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