Cause and Solution for Air in the Hydraulic Hose

Cause and Solution for Air in the Hydraulic Hose

Summary

Jerky movement of a butt fusion machine may be caused by air trapped in the hydraulic hose. This guide explains the cause and shows how to remove air from the hydraulic system step by step.

Cause and Solution for Air in the Hydraulic Hose
Cause and Solution for Air in the Hydraulic Hose
During the operation of a butt fusion machine, the machine frame may sometimes move unevenly when traveling forward or backward. Operators may notice that the movement appears jerky or intermittent instead of smooth.

One possible reason for this situation is the presence of air inside the hydraulic hoses.
Why Air in the Hydraulic System Causes Jerky Movement
Hydraulic systems rely on stable oil pressure to move the machine frame smoothly.
If air is trapped in the hydraulic hoses, the oil flow may become unstable during operation. As a result, the machine may move in small steps instead of a continuous motion.

This condition does not usually indicate a mechanical fault. In most cases, the issue can be solved by removing the air from the hydraulic system.
How to Remove Air from the Hydraulic Hose
The following procedure can help release the air from the hydraulic hoses.
1.Connect the hydraulic quick couplings properly.
2.Open the oil tank cap.
3.Keep the pressure relief valve closed.
4.Operate the machine forward and backward for about 20 seconds.
5.Repeat this operation several times.
By repeating the forward and backward movement, the trapped air inside the hydraulic hoses can be gradually released, allowing the hydraulic system to return to normal operation.
Operation Demonstration Video
The following video shows the actual operation process for removing air from the hydraulic hose.