A4VTG71 A4VTG90 Hydraulic pumps

The A4VTG71 and A4VTG90 are types of hydrostatic piston pumps designed for high-pressure applications, commonly found in hydraulic systems. These models are specifically engineered to cater to the demanding needs of hydraulic drives in closed circuits.

Both the A4VTG71 and A4VTG90 feature a robust and compact axial piston design, which is optimized for high efficiency and longevity under heavy-duty conditions. The construction typically includes:

  • Axial Piston Unit: Operates based on the bent axis principle, ensuring high power density and performance.
  • Swash Plate: Its angle determines the flow rate, allowing for variable pump displacement.
  • Control Valve: Integrated within the pump, it directs the hydraulic fluid flow based on the operational requirements.
  • Charge Pump: A smaller, auxiliary pump that maintains the hydraulic circuit’s pressure and compensates for leakage.
  • Pressure Relief Valves: Protect the system from overpressure conditions, ensuring safety and reliability.
  • Shaft Seal: Designed to withstand high-pressure conditions and prevent fluid leakage.

The primary function of the A4VTG71 and A4VTG90 is to convert mechanical energy into hydraulic energy by pumping hydraulic fluid into a closed hydraulic circuit at a specified flow rate and pressure. Their operation involves:

  • Variable Displacement: By adjusting the swash plate angle, the pump’s displacement and, consequently, the flow rate can be varied, allowing for precise control of the hydraulic system’s speed and torque.
  • Hydrostatic Transmission: These pumps are integral components of hydrostatic drives, offering efficient power transmission for variable speeds and reversible operation.
  • Energy Efficiency: Designed to optimize hydraulic system efficiency by reducing energy losses and improving overall performance.

The A4VTG71 and A4VTG90 are widely used in various heavy-duty applications, including but not limited to:

  • Construction Machinery: Such as concrete mixers, where precise control of the drum rotation is essential.
  • Agricultural Equipment: Including tractors and combines, where variable speed and high torque are necessary for optimal performance.
  • Marine Applications: For propelling and steering mechanisms, offering reliable and efficient power transmission in a compact form.
  • Industrial Machinery: In applications requiring precise control of hydraulic systems under high-pressure conditions.

The A4VTG71 and A4VTG90 hydraulic pumps are critical components in many high-demand applications, valued for their reliability, efficiency, and adaptability. Their design and functionality make them ideal for a wide range of heavy-duty hydraulic systems, ensuring optimal performance and control.