Choosing the right hydraulic pump is not only about brand or price. It is about matching pump design with pressure requirement, duty cycle, control accuracy, and operating conditions.
Among Bosch Rexroth hydraulic pumps, axial piston pumps and gear pumps are the two most commonly used types across Indian industries.
At Infinity Hydraulic Pumps, we regularly support customers who are confused between these two options. This article explains the real technical differences, practical applications, and a clear selection logic to help you choose the right Rexroth pump for your system.
Understanding Axial Piston Pumps (Working Principle)
An axial piston pump uses multiple pistons arranged in a circular block. These pistons move parallel to the drive shaft. When the shaft rotates, the pistons slide against a swash plate, creating suction and discharge cycles.
Key working points:
- Pistons move axially inside a rotating cylinder block
- Flow is controlled by changing the swash plate angle
- Can be variable displacement or fixed displacement
- Designed for high pressure and precision control
Bosch Rexroth axial piston pumps are commonly used where pressure stability, efficiency, and control accuracy are critical.
Understanding Gear Pumps (Working Principle)
A gear pump works using two inter-meshing gears inside a casing. As the gears rotate, hydraulic oil is trapped between the gear teeth and casing and pushed from inlet to outlet.
Key working points:
- Simple positive displacement design
- Fixed flow output
- Minimal internal components
- Easy to install and maintain
Rexroth gear pumps are preferred for basic hydraulic circuits where simplicity and cost control matter more than precision.
Pressure Range Comparison
Pressure capability is one of the biggest deciding factors.
| Pump Type | Typical Pressure Range |
|---|---|
| Rexroth Gear Pump | Up to ~210 bar |
| Rexroth Axial Piston Pump | 280 bar to 420 bar (model dependent) |
Conclusion:
If your system operates at high pressure or fluctuating load, axial piston pumps are the correct choice. Gear pumps are suitable for low to medium pressure applications.
Efficiency and Noise Levels
Axial Piston Pumps
- Higher volumetric and mechanical efficiency
- Better performance under continuous load
- Lower heat generation in long-running systems
- Generally quieter at higher pressures
Gear Pumps
- Moderate efficiency
- Noise increases as pressure rises
- More suitable for intermittent duty cycles
In industries where energy consumption and noise control are important, axial piston pumps deliver better long-term performance.
Control, Flexibility, and System Response
Axial piston pumps offer:
- Variable flow control
- Load sensing capability
- Pressure compensation
- Servo and proportional control integration
Gear pumps offer:
- Fixed flow only
- Limited control flexibility
- Simple ON/OFF hydraulic circuits
In high-pressure systems, axial piston pumps are commonly paired with hydraulic motors used with axial piston pumps to achieve precise speed and torque control.
Ideal Applications – Where Each Pump Fits Best
Rexroth Axial Piston Pump Applications
- Injection moulding machines
- Hydraulic presses
- CNC and machine tools
- Steel plants and rolling mills
- Construction equipment
- Servo hydraulic systems
Rexroth Gear Pump Applications
- Agricultural machinery
- Material handling equipment
- Power packs with simple circuits
- Lubrication systems
- Mobile hydraulics with basic functions
In applications like presses and material handling equipment, axial piston pumps supply consistent pressure to hydraulic cylinders for linear motion, ensuring smooth and controlled operation.
Maintenance and Service Considerations
From field experience at Infinity Hydraulic Pumps:
- Gear pumps are easier to repair and tolerate contamination better
- Axial piston pumps require cleaner oil and proper filtration
- Incorrect oil quality affects piston pumps faster than gear pumps
However, when maintained correctly, Rexroth axial piston pumps provide longer service life in demanding applications.
Selection Logic – Which One Should You Choose?
Ask these practical questions before deciding:
- Does your system operate above 210 bar?
- Do you need variable flow or energy saving?
- Is precision movement important?
- Will the machine run continuously for long hours?
- Is automation or PLC integration required?
Simple rule:
- Choose a Rexroth gear pump for basic, cost-effective, low-pressure systems
- Choose a Rexroth axial piston pump for high-pressure, efficient, controlled, and long-duty applications
Expert Advice from Infinity Hydraulic Pumps
Since 2020, Infinity Hydraulic Pumps has been working closely with Indian industries to select, repair, and optimise Rexroth hydraulic systems. Our team of hydraulic engineers evaluates:
- Actual operating pressure
- Oil temperature and contamination level
- Duty cycle and load pattern
- Existing system design limitations
Instead of recommending based on catalog values alone, we focus on real working conditions, which helps avoid over-sizing, overheating, and premature failures.
Final Thoughts
Both Rexroth axial piston pumps and gear pumps have their own strengths. The wrong choice leads to higher energy costs, frequent breakdowns, and poor machine performance.
Understanding how each pump works and where it fits best is the key to building a reliable and efficient hydraulic system.
If you are planning a new hydraulic setup or facing performance issues with an existing pump, correct technical selection matters more than brand or price.