A Guide to Hydraulic Cylinder Parts 

You might work with it every day, but do you know exactly what a hydraulic cylinder is made up of? Learning about each part can go a long way in understanding how your cylinder works, and can assist you in being able to accurately troubleshoot any issues, and get your machine to work at its optimal performance level.

Use our comprehensive guide to learn about each hydraulic cylinder part, so you can have crucial mastery of the system.

1. Clevis (Cylinder Cap) 

The clevis is a kind of mounting system for hydraulic cylinders. It allows hydraulic cylinders to pivot in a motion along an axis.

A cylinder cap is where the clevis is attached to, and is one of the most common mounting systems. It’s often used when it requires the cylinder to pivot through an arc, retracting and extending.

2. End Cap (Cylinder Head)

End caps cover the pressure chamber from one end of the hydraulic cylinder, also known as the cylinder head.

They’re connected to the cylinder’s body through bolts, rods, or threading.

3. Port

The port is where fluid enters and exits the system. If it’s a double acting hydraulic cylinder, there are two ports located at either end of the cylinder.

Ports need to be secure so as not to allow any leaks to occur.

4. Piston

Found inside the cylinder, the piston separates the pressure zones inside the cylinder’s barrel. The back and forth action that the piston creates is what generates the power.

Pistons come in two different resting states; sprung in and sprung out, which is when it’s in a retracted position or an extended position.

5. Piston Rod

One of the most critical parts of a hydraulic cylinder, the piston rod extends and retracts, generating the movement that the cylinder requires to function.

It’s attached to the piston and the cylinder head.

6. Cylinder Barrel

Cylinder barrels are made from highly durable materials to endure a lot of stress, as it is what’s keeping the pressure inside the cylinder while housing the piston.

7. Gland (Seal Gland)

The gland is equipped with a number of seals to prevent the pressurised fluid from leaking beyond the piston rod or cylinder head.
The seal gland allows for easy removal and replacement of all the seals in the hydraulic cylinder.

8. Seal

Seals are found all throughout the hydraulic cylinder, and are designed to withstand the constant movement of the piston rod moving in and out of the barrel.

Different kinds of seals are used depending on the hydraulic cylinder’s application.

If you’re still scratching your head when it comes to understanding your hydraulic cylinder, or have any issues with your hydraulic system, contact us today for assistance in any of your queries. We are the experts in hydraulic repairs and replacements.