Bleeding a Double Acting Hydraulic Cylinder: A Step-by-Step Guide

how to bleed a double acting hydraulic cyliner

How to Bleed a Double Acting Hydraulic Cylinder

Bleeding a double acting hydraulic cylinder is a crucial process to remove air and other contaminants from the system, ensuring smooth and efficient operation. Air pockets and contamination can cause damage to the cylinder, seals, and other components, leading to costly repairs and downtime. To bleed a double acting hydraulic cylinder, follow these steps:

Preparation

Before starting the bleeding process, make sure the hydraulic system is turned off and the cylinder is in a safe position. Lock out the system to prevent accidental start-up. Next, identify the bleed valves or ports on the cylinder. Typically, double acting hydraulic cylinders have two bleed valves, one for each chamber.

Bleeding Procedure

To bleed the cylinder, follow these steps:

• Loosen the bleed valve on the rod end of the cylinder (chamber 1) by turning it counterclockwise.
• Pump the hydraulic fluid into the cylinder, slowly extending the rod.
• As the fluid flows into the cylinder, air will be pushed out through the bleed valve. Continue pumping until fluid starts to come out of the valve.
• Tighten the bleed valve in a clockwise direction to secure it.
• Repeat the process for the blind end of the cylinder (chamber 2) by loosening the second bleed valve and pumping fluid into the cylinder.

Important Considerations

When bleeding a double acting hydraulic cylinder, it's essential to work slowly and carefully to avoid introducing more air into the system. Also, make sure to use the correct hydraulic fluid and follow the manufacturer's recommendations for bleeding procedures. If you're unsure about any part of the process, consult the cylinder's manual or seek assistance from a qualified technician.