Pressurized fluid pushes directly against a hydraulic cylinder's piston. This pressure moves the piston, which moves whatever else the cylinder rod end is attached onto. Most cylinders have a small number of parts, but the piston is probably the most important part of a hydraulic cylinder. If a cylinder malfunctions, the piston may be to blame, but the only way to access the piston is to take the entire cylinder apart.
Things You'll Need
- Bench vise
- Soft jawed-vise
- Snap-ring pliers
- Spanner wrench
- Gland wrench
Unscrew any hydraulic caps on the cylinder ports drain all the hydraulic fluid. Tilt each fluid port over a bucket and let the fluid drain into it.
Secure the cylinder in a bench vise and pull the rod until it fully extends.
Remove the head cap or other piston rod retaining device. Use a spanner wrench to remove most typical end caps; but you will need snap-ring pliers to remove a head cap or rod guide held by a snap ring. Other cylinders may be secured with different retaining devices that may also require special tools.
Pull the rod completely out of the cylinder barrel.
Place the entire rod end into a soft-jawed vise.
Unscrew the nut that secures the piston. Remove the nut and the piston.
- Photo Credit pump image by Aleksander Nordaas from Fotolia.com
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