A4VSO40 Hydraulic Axial Piston Pump: Cast Iron Housing 400 Bar Max Pressure

A4VSO40 Hydraulic Axial Piston Pump: Cast Iron Housing 400 Bar Max Pressure

Features:

Technical data:

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Competitive Advantage:

1. The A4VSO piston pump incorporates automatic axial and radial force balancing mechanisms that counteract unbalanced forces generated during high‑pressure operation, thereby reducing bearing loads and preventing shaft deflection. This proprietary axial piston pump technology ensures smooth, vibration‑free running across the full operational envelope, resulting in extended bearing and seal life. Equipment manufacturers in sectors like mining, tunneling, and forestry can rely on consistent volumetric performance and minimal wear, even under dynamic load swings inherent to cyclical digging, drilling, and tree‑harvesting processes. The balanced force design reduces maintenance and enhances machine reliability in the toughest working conditions.

2. Supporting both closed‑loop servo and open‑loop proportional control schemes, the A4VSO hydraulic pump offers flexibility to tailor system performance to specific application requirements. In closed‑loop configurations, integrated displacement sensors enable real‑time feedback for ultra‑precise positioning and force control, ideal for robotics, die‑casting machines, and wind turbine blade pitch actuators. In open‑loop mode, the pump operates with reduced electronic complexity and cost, yet still delivers energy‑saving benefits through optimized displacement control. This dual‑mode capability makes the pump an attractive choice for OEMs seeking a single platform that can address a wide spectrum of control and efficiency objectives.

3. The A4VSO axial piston pump enables energy‑saving soft‑start and soft‑stop strategies by ramping displacement gradually during start‑up and shutdown sequences, effectively smoothing out power draw and eliminating current inrush peaks. This gentle ramping protects drive motors, hydraulic accumulators, and control valves from mechanical and electrical stress, thereby extending component life and reducing maintenance costs. Industrial OEMs implementing this hydraulic pump in systems such as textile machinery, material handling conveyors, and automated guided vehicles benefit from enhanced electrical grid stability, lower inrush currents at start, and improved lifecycle economics.

The Analysis For Rexroth A4VSO Piston Pump Common Breakdown: 

1. Blocked lubrication passages causing poor lubrication: Presence of fibers or large particulates in the hydraulic oil can clog internal lubrication galleries and micro‑ports, depriving pistons, cylinder bores, and valve components of essential lubrication. This leads to metal‑to‑metal contact, resulting in abrasive wear. Symptoms include increased noise levels and efficiency loss. Remedy by disassembling the pump, performing ultrasonic cleaning of internal oil passages, and upgrading filtration to 5 µm or finer to prevent recontamination and ensure proper lubrication of the axial piston pump’s moving parts.

2. Excessive back‑pressure at pump return port: If an incorrectly specified check valve or an overly stiff valve spring is installed at the return line, back‑pressure can exceed recommended levels, impairing pump output and increasing internal leakage. Indicators include sudden drops in pump efficiency and unexpected temperature rises. Check return line pressure and maintain it below the manufacturer’s maximum (e.g., 5 bar). If necessary, replace the valve with one having appropriate spring characteristics or remove superfluous back‑pressure devices to restore proper function of the hydraulic pump.

3. Hydraulic oil emulsification causing failure: Operating in humid or water‑contaminated environments with inadequate reservoir sealing can allow water ingress. Water emulsification with hydraulic oil destroys the lubricating film, causing metal components to contact directly and accelerate wear. This condition leads to steep declines in volumetric and mechanical efficiency, accompanied by corrosion‑type noises. The remedy involves draining the reservoir, thoroughly cleaning the hydraulic circuit, installing high‑efficiency water removal filters, and adding manufacturer‑recommended demulsifying additives to restore oil properties and protect the axial piston pump.