What is the stopping procedure for a Rexroth pump?

As a supplier of Rexroth pumps, I often encounter customers who are curious about the stopping procedure for these high - quality hydraulic pumps. Understanding the proper stopping procedure is crucial for maintaining the longevity and performance of the Rexroth pumps. In this blog, I will delve into the details of the stopping process, taking into account different types of Rexroth pumps and various operating scenarios.

General Considerations for Stopping Rexroth Pumps

Before we get into the specific steps, it's important to understand some general principles. Rexroth pumps are designed to operate under specific conditions, and any sudden or improper stopping can lead to issues such as pressure surges, cavitation, and mechanical damage. Therefore, a well - planned stopping procedure is essential.

The first step in the stopping process is to reduce the load on the pump gradually. This is because a sudden drop in load can cause a rapid change in pressure within the hydraulic system, which may damage the pump and other components. For example, if the pump is powering a heavy - duty machine, gradually reducing the speed or force applied by the machine will help the pump adjust to the changing operating conditions.

Stopping Procedure for Vane Pumps

Let's start with vane pumps, such as the PV7 - 1X/20 - 20RA01MA Vane Pump Machine Tool Specific Pump. Vane pumps are known for their smooth operation and high efficiency, but they also require a careful stopping process.

1. Reduce the Flow Rate: Begin by gradually reducing the flow rate of the hydraulic fluid. This can be done by adjusting the control valves in the system. A slow reduction in flow rate helps prevent pressure spikes and allows the pump to slow down smoothly.
2. Monitor the Pressure: As you reduce the flow rate, closely monitor the pressure within the system. The pressure should decrease gradually. If there is a sudden drop or increase in pressure, it may indicate a problem in the system, and you should stop the process immediately to investigate.
3. Shut Off the Power: Once the flow rate and pressure have reached a safe level, shut off the power supply to the pump. Make sure to follow the manufacturer's instructions for shutting off the power, as different models may have different requirements.
4. Relieve the Pressure: After shutting off the power, relieve any remaining pressure in the system. This can be done by opening the pressure - relief valves. This step is important to prevent damage to the pump and other components when the system is restarted.

Stopping Procedure for Variable Hydraulic Motors

Variable hydraulic motors, like the Variable Hydraulic Motor A6VM80 Rexroth, have a different stopping procedure compared to vane pumps. These motors are designed to adjust their displacement according to the load, which requires a more complex stopping process.

1. Reduce the Displacement: First, gradually reduce the displacement of the motor. This can be done by adjusting the displacement control mechanism. Reducing the displacement helps the motor slow down gradually and reduces the stress on the pump.
2. Lower the Speed: As you reduce the displacement, also lower the speed of the motor. This can be achieved by adjusting the flow rate of the hydraulic fluid. A coordinated reduction in displacement and speed ensures a smooth stopping process.
3. Stop the Fluid Flow: Once the motor has reached a low speed, stop the flow of hydraulic fluid to the motor. This can be done by closing the control valves.
4. Check for Leakage: After stopping the motor, check for any signs of leakage in the hydraulic system. Leakage can indicate a problem with the seals or other components, which should be addressed immediately.

Stopping Procedure for Piston Pumps

Piston pumps, such as the Rexroth A4VG56 A4VG71 Piston Pump, are known for their high - pressure capabilities and durability. However, they also require a specific stopping procedure.

1. Reduce the Pressure: Begin by gradually reducing the pressure in the system. This can be done by adjusting the pressure - control valves. A slow reduction in pressure helps prevent damage to the pistons and other internal components of the pump.
2. Decrease the Flow Rate: As you reduce the pressure, also decrease the flow rate of the hydraulic fluid. This helps the pump slow down smoothly and reduces the risk of cavitation.
3. Shut Off the Drive: Once the pressure and flow rate have reached a safe level, shut off the drive mechanism of the pump. This could be an electric motor or a diesel engine, depending on the application.
4. Cool Down the Pump: Piston pumps generate a significant amount of heat during operation. After shutting off the pump, allow it to cool down naturally. Do not attempt to restart the pump immediately, as this can cause thermal stress and damage the pump.

Special Considerations for Different Operating Environments

The stopping procedure may also vary depending on the operating environment. For example, in a cold environment, the hydraulic fluid may have a higher viscosity, which can affect the stopping process. In such cases, it may be necessary to pre - heat the fluid or use a lower - viscosity fluid to ensure a smooth stopping process.

In a dirty or dusty environment, it's important to protect the pump from contaminants. After stopping the pump, make sure to cover the inlet and outlet ports to prevent dust and debris from entering the system.

Importance of Regular Maintenance

Regular maintenance is crucial for ensuring the proper functioning of Rexroth pumps and for following the correct stopping procedure. Maintenance tasks include checking the fluid level, changing the filters, and inspecting the seals and other components for wear and tear. By performing regular maintenance, you can identify and address any potential issues before they become major problems, which will help extend the lifespan of your Rexroth pump.

Conclusion

In conclusion, the stopping procedure for Rexroth pumps is a critical aspect of their operation. Whether you are using a vane pump, a variable hydraulic motor, or a piston pump, following the correct stopping procedure will help maintain the performance and longevity of the pump. By gradually reducing the load, monitoring the pressure and flow rate, and following the manufacturer's instructions, you can ensure a smooth and safe stopping process.

If you are interested in purchasing Rexroth pumps or need more information about their operation and maintenance, please feel free to contact us for procurement and negotiation. We are here to provide you with the best solutions for your hydraulic system needs.

References

• Rexroth Hydraulic Pump Operation Manuals
• Hydraulic System Design and Maintenance Guides
• Industry - standard Hydraulic Engineering Textbooks