Rexroth A4fo40/71/125/180/250 Piston Pump 400 Bar For Conveyor / Winch Drives

Product Overview

Rexroth A4FO series represents high-performance fixed displacement axial piston units designed for both pump and motor applications in industrial and mobile hydraulics. 

Key Features and Benefits

· Dual Functionality: Can operate as either a hydraulic pump or motor, providing design flexibility
· High Power Density: Compact design delivers maximum performance in minimal space
· Excellent Efficiency: Optimized hydraulics ensure high volumetric and mechanical efficiency
· Robust Construction: Heavy-duty bearings and hardened components ensure long service life
· Multiple Configurations: Available in various displacements, shaft types, and porting options
 

Technical Specifications

· Series: A4FO
· Type: Fixed Displacement, Axial Piston Unit (Pump/Motor)
· Displacement Range: 28 cm³/rev to 500 cm³/rev
· Maximum Pressure:
  · As Pump: Up to 400 bar (5,800 psi) continuous
  · As Motor: Up to 450 bar (6,500 psi) intermittent
· Speed Range: Up to 3,600 rpm (depending on size)
· Efficiency: >95% volumetric efficiency
· Mounting: Standard SAE and ISO flange mounts
· Shaft Options: Splined, keyed, or tapered shaft ends

Working Principle

The A4FO operates on the bent-axis principle. The cylinder block and drive shaft are connected at a fixed angle, causing the pistons to reciprocate as the unit rotates. This fixed geometry creates a constant displacement per revolution. When used as a pump, mechanical energy is conver

Applications

As Hydraulic Pump:

· Industrial hydraulic power units
· Machine tool hydraulics
· Press and injection molding machines
· Mobile equipment hydraulic systems

As Hydraulic Motor:

· Winch and hoist drives
· Conveyor systems
· Mixer and agitator drives
· Wheel drives for mobile equipment
· Fan and pump drives

Configuration Options

· Rotation: Clockwise or counter-clockwise rotation available
· Porting: Various port connection styles and positions
· Shaft Types: SAE splined, DIN splined, parallel key, or tapered shafts
· Drain Connections: Multiple drain port options for flexible installation
· Mounting Flanges: Standard SAE and ISO mounting patterns

Selection Guide

Choose the right A4FO unit by considering:

1. Application Type: Determine whether used as pump or motor
2. Displacement Requirements: Calculate required flow (pump) or torque (motor)
3. Pressure Needs: Identify operating and peak pressure requirements
4. Speed Range: Verify operating speed matches unit capabilities
5. Shaft Requirements: Select appropriate shaft type for your coupling
6. Mounting Configuration: Confirm flange type and port orientation

Contact our hydraulic experts for application-specific recommendations.

Frequently Asked Questions (FAQ)

· Q: Can A4FO units be used as both pump and motor?
  · A: Yes, the A4FO is designed to operate efficiently as either a hydraulic pump or motor, providing excellent flexibility in system design.
· Q: What is the maximum speed for A4FO units?
  · A: Maximum speed depends on displacement size, ranging from 1,800 rpm for larger units (500 cm³) to 3,600 rpm for smaller units (28 cm³).
· Q: Are there special requirements for using A4FO as a motor?
  · A: When used as a motor, consider case drain flow requirements and ensure proper flushing flow for optimal bearing life.
· Q: Where can I find installation dimensions?
  · A: Complete dimensional drawings are available in the product documentation. Contact us for specific dimension sheets.

Model numbers