Axial Piston Units
Variable Pumps
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Variable displacement hydraulic pumps from Rexroth offer a wealth of features, plus a product variety that delivers a variable pump solution for almost any hydrostatic drive or circuit type.
Below is extensive information about specific variable pump products. You can also learn more about the complete range of Rexroth mobile hydraulic applications.
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Model Code AA4VG, Series 32
Variable Displacement Pump, Closed Circuit
Key Features:
- Sizes 28 to 250
- Nominal pressure 5800 psi (400 bar)
- Peak pressure 6500 psi (450 bar)
- Closed circuit design
- Swashplate design ideal for hydrostatic closed circuit transmissions
- Infinitely variable flow -- proportional to drive speed and displacement
- Two pressure relief valves on the high pressure ports to protect the hydrostatic transmission (pump and motor) from overload
- Pressure relief valves also function as boost valves
- Integrated boost pump acts as a feed pumo and control pressure supply
- Maximum boost pressure limited by built-in boost pressure relief valve
- The integral pressure cut-off is standard
Find out more about Variable Displacement Pump AA4VG, Series 32 (PDF)
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Model Code AA4VG, Series 40
Variable Displacement Pump, Closed Circuit
Key Features:
- Sizes 45 to 175
- Nominal pressure 6525 psi (450 bar)
- Peak pressure 7250 psi (500 bar)
- Closed circuit design
- Swashplate design ideal for hydrostatic closed circuit transmissions
- Infinitely variable flow -- proportional to drive speed and displacement
- Two pressure relief valves on the high pressure ports to protect the hydrostatic transmission (pump and motor) from overload
- High pressure relief valves also function as boost valves
- Integrated boost pump acts as a feed pumo and control pressure supply
- Maximum boost pressure limited by built-in boost pressure relief valve
- The integral pressure cut-off is standard
Find out more about Variable Displacement Pump AA4VG, Series 40 (PDF)
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Model Code A4VTG
Variable Displacement Pump for Concrete Mixer Drum Drive
Key Features:
- Sizes 71, 90
- Swashplate design ideal for hydrostatic closed circuit transmission
- Infinitely variable flow -- proportional to drive speed and displacement
- Output flow increases with swashplate swivel angle (from 0 to maximum value)
- Flow direction changes smoothly when swashplate is moved through neutral position
- Two pressure-relief valves on the high pressure ports to protect the hydrostatic transmission (pump and motor) from overload
- High-pressure relief valves also function as boost valves
- Integrated boost pump to replenish leakage and provide control oil.
- Built-in boost pressure-relief valve limits maximum boost pressure
Learn more about Variable Displacement Pump A4VTG (PDF)
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Model Code A4VSO
Variable Displacement Pump, Open Circuit
Key Features:
- Sizes 40 to 1000
- For application use requiring large displacements such as cranes, excavators, and winches
- Swashplate design
- Infinitely variable displacement
- Good self priming suction characteristics
- Continuous operating pressure of 5100 psi (350 bar)
- Excellent service life
- Drive shaft designed to accept axial and radial loading
- Low power to weight ratio
- Over-center design (swallow circuits)
- Through drive and pump combinations possible
- Swivel angle indicator standard
- Operation on HF fluids permitted at de-rated parameters
Get more information on Variable Displacement Pump A4VSO, HFC Hydraulic Fluids, LR3 Control for A4VSO, or HD Control for A4VSO(all PDF)
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Model Code AA11VO
Variable Displacement Pump, Open Circuit
Key Features:
- Sizes 40 to 260
- Swashplate design ideal for hydrostatic drives in open circuit hydraulic system
- Designed with mobile applications in mind
- Can operate under self-priming conditions, with tank pressurization, or with an optional built-in charge pump (impeller)
- Comprehensive range of control options for any application requirement
- Power control option is externally adjustable, even when pump is running
- Gear pumps and axial piston pumps can be added to through drive -- up to 100% through drive
- Output flow proportional to the drive speed and infinitely variable between maximum and zero
Get more information on the Variable Displacement Pump AA11VO (PDF)
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Model Code A10VO, Series 31
Variable Displacement Pump, Open Circuit
Key Features:
- Variable, swashplate design for hydrostatic transmissions in open loop circuit
- Flow proportional to drive speed and displacement – infinitely varied flow produced by adjusting swashplate angle
- Mounting flange meets SAE J744
- Flanged ports meets SAE J518
- 2 case drain ports
- Good suction characteristics
- Permissible working pressure 4000 psi (280 bar)
- Low noise level
- Long service life
- Axial and radial loading of drive shaft possible
- High power weight ratio
- Wide range of controls
- Through drive option for multi-circuit system
Discover more information on the Variable Displacement Pump A10VO/31 (PDF)
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Model Code A10VO, Series 52 & 53
Variable Displacement Pump, Open Circuit
Key Features:
- Swashplate design for open-circuit hydrostatic drives
- Flow proportional to drive speed and displacement – infinitely variable flow produced by adjusting swashplate angle
- Strong bearings for long service life
- High drive speeds possible
- High power to weight ratio
- Compact size
- Good suction characteristics
- Axial and radial loading of drive shaft possible
- Pressure and flow control
- Electro-hydraulic pressure control
- Power control
- Electro-proportional displacement control
Get additional information on the Variable Displacement Pump A10VO/52 & 53 (PDF)
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Model Code A10VNO
Variable Displacement Pump, Open Circuit
Key Features:
- Sizes 28 to 85
- Swashplate design for open-circuit hydrostatic drives
- Flow proportional to drive speed and displacement – infinitely variable flow produced by adjusting swashplate angle
- High power to weight ratio – compact size
- Low noise level
- Permissible continuous pressure of 210 bar
- Axial and radial loading of drive shaft possible
- Pressure and flow control
- Short response times
- Proven A10 technology
- Extremely compact mounting dimensions
- Cost-effective alternative to fixed displacement pumps
- Designed for optimum cost-effectiveness
Download additional information on the A10VNO Variable Displacement Pump (PDF)
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Model Code AA10VG
Variable Displacement Pump, Closed Circuit
Key Features:
- Sizes 18 to 63
- Swashplate design suited for hydrostatic closed circuit transmission
- Infinitely variable flow proportional to drive speed and displacement
- Output flow increases with the swivel angle of the swashplate (from 0 to maximum value)
- Flow direction changes smoothly when swashplate is moved through the neutral position
- Wide range of highly adaptable control devices available for various control and regulating functions
- Two pressure relief valves on the high pressure ports to protect hydrostatic transmission (pump and motor) from overload
- Pressure relief valves also function as boost valves
- Integrated boost pump acts as a feed and control oil pump
- Maximum boost pressure is limited by a built-in boost pressure relief valve
Get more information about Variable Displacement Pump AA10VG (PDF)
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Model Code A30VG
2 Circuit Axial Piston Variable Pump, Closed Circuit
Key Features:
- Size 28
- Compact 2-circuit variable pump has swashplate design for closed circuit drive solutions
- Two equal flows from one pump -- supplying 2 separate circuits
- All functions necessary for differential lock effect are integrated in the pump
- Flow increases with swashplate swivel angle from 0 to its maximum value
- Wide range of highly adaptable control devices available for various control and regulating functions
- Single control for both circuits
- Two pressure-relief valves on the high pressure ports of each circuit to protect hydrostatic transmission (pump and motor) from overload
- High-pressure relief valves also function as boost valves
- Integrated boost pump acts to replenish leakage and provide control oil
- Maximum boost pressure is limited by a built-in boost pressure-relief valve
Here’s additional information on the A30VG 2 Circuit Axial Piston Variable Pump (PDF)
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Model Code A20VG/A22VG
Axial Piston Variable Double Pump, Closed Circuit
Key Features:
- Sizes 18, 45
- Only one case drain for both circuits is required
- Integrated auxiliary pump for boost and control oil supply (optional)
- Combined boost and high pressure relief valves
Learn more about the A20/A22VG Double Pump (PDF)
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Model Code A7VO
Variable Displacement Pump, Open Circuit
Key Features:
- Sizes 55 to 500
- Pump features bent axis for hydrostatic drives in open circuits
- Flow proportional to drive speed and displacement – infinitely variable through adjustment of the bent axis.
- Axial tapered piston rotary group features bent axis design
- Infinitely variable displacement
- Compact, robust bearing system designed for long service life
- Optional long-life bearings
- Good performance-to-weight ratio
- Pressure control supplied as standard
- External controller adjustment during operation
- Optional visual or electrical swivel angle indication
- Can be installed in any position
- HF operation possible with reduced specifications
Find out more about the Variable Displacement Pump, Sizes 55...160 or the Variable Displacement Pump, Sizes 250...500 (both PDF)
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Model Code KVAA
Variable Displacement Pump, Designed for Commercial Vehicles
Key Features:
- Sizes 55 to 107
- Pump features axial tapered piston rotary group of bent axis design.
- Designed especially for commercial vehicle requirements.
- Output flow is proportional to the drive speed and pump displacement -- steplessly variable between maximum and zero (qv max to qv min = 0).
- Favorable power/weight ratio, compact overall dimensions, optimum efficiency, and economical design
- Self aspirating for open circuit operation
- Flange and shaft designed for direct mounting on truck gearbox PTO
More information on Variable Displacement Pump KVAA (PDF)
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Model Code A8VO
Variable Displacement Double Pump, Open Circuit
Key Features:
- Sizes 55 to 200
- Pump features two axial tapered piston rotary groups with bent axis design for open circuit hydrostatic drives
- Flow is proportional to drive speed and displacement -- infinitely variable between qV ma.x and qV min. of 0
- Can be mounted directly on the flywheel housing in diesel engines
- Single common suction port for auxiliary pump and both circuits.
- Wide range of control instruments for various control and regulating functions
- Individual power control
- Integrated auxiliary pump with pressure relief valve – additional pressure reducing valve is an option
- Power take-off for mounting axial piston and gear pumps
- Excellent power to weight ratio
- Long service life
Find out more about Variable Displacement Double Pump A8VO (PDF)
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