How to Bleed Air in a Hydraulic Cylinder?

There are a lot of moving parts in a hydraulic system, and if one of them isn’t working right, the whole system can break down. If you’re having trouble with your hydraulic system, it might be time to start by bleeding the air out of the cylinders. In this article, we’ll show you how to do that. Stay tuned!

What is air in a hydraulic cylinder and why should it be removed?

Hydraulic cylinders are an essential component of many machines and devices, providing the power to create linear motion. However, these cylinders can be delicate, and one of the biggest threats to their performance is air in the system. Air can enter the system through a small leak or crack, and it quickly gathers in the cylinder, compressing under pressure. 

This compressed air acts as a cushion, absorbing shock and preventing the hydraulic fluid from doing its job. As a result, the machine may not operate as efficiently as it should. In some cases, air in the system can also cause the cylinder to fail completely. For these reasons, it is important to remove air from hydraulic cylinders on a regular basis. 

There are a few different ways to do this, but the most effective method is to use a vacuum pump. By removing air from the system, you can help keep your hydraulic cylinders operating correctly for years to come.

There are many different hydraulic cylinders manufacturers out there, each with their own strengths and weaknesses. It’s important to select a reputable manufacturer that produces high-quality products. 

How to identify the source of air in a hydraulic cylinder?

Air in a hydraulic system can cause major problems. It can reduce the effectiveness of the system, cause component failure, and lead to premature pump failure. There are two main sources of air in a hydraulic system: ingress through external seals and leaks, and contamination during fluid build-up and container filling. 

  • The first step in identifying the source of air in a hydraulic cylinder is to check for external leaks. Inspect all seals, hoses, and fittings for any signs of damage or wear. If there are no external leaks. 
  • The next step is to check for contaminated fluid. If the fluid is dirty or cloudy, it may be contaminated with air. 
  • Finally, if the system is not functioning properly, it may be due to an internal leak. To check for an internal leak, remove the cylinder from the system and pressurize it with nitrogen. If there is a drop in pressure, there is an internal leak. 

By following these steps, you can identify the source of air in a hydraulic cylinder and take appropriate action to fix the problem.

Tips for proper bleeding of hydraulic cylinder

Bleeding a hydraulic cylinder is a common task that is often performed to remove air from the cylinders. There are a few different ways to properly bleed a hydraulic cylinder, but the most important thing is to make sure that all of the air is removed from the system. 

  • One way to bleed a hydraulic cylinder is to use a hand pump. This method can be done by attaching a hose to the bleeder valve and then Pumping the handle of the pump until all of the air is removed from the system. 
  • Another way to bleed a cylinder is by gravity bleeding. This method can be done by opening the bleeder valve and then allowing the fluid to flow out until all of the air has been removed. 

Whichever method you choose, it is important to make sure that all of the air is removed from the system before you close the bleeder valve. If there is still air in the system, it will compress when pressure is applied and could cause damage to components in the system.

Bottom line 

In conclusion, the best way to bleed air out of a hydraulic cylinder is by using the pump. Pumping will push fluid and any air trapped in the system through the return line and back into the reservoir. You can also use a manual bleeder valve to release air from the system, but this process will take longer. Remember to keep an eye on your fluid level as you bleed air from the cylinder, and add more fluid if necessary.