Cylinder rating

[jhlittle]

As I've stated before I don't know much about hydraulics. Is there any way to tell what a cylinder is rated for based on measurements? I have 2 cylinders that were given to me but we don't know what their capacity is.

Thanks

 

[J_J]

A hyd shop probably can run some test to see what the pressure limits are.

They test things like pressure, bypassing, etc.

 

[jhlittle]

Thanks j_j

 

[dfkrug]

Is there any way to tell what a cylinder is rated for based on measurements?

You can get some idea, yes. The biggest factor is whether they are tie-rod or welded construction. Tie
rod cyls depend on the tie rods to keep the ends on, so they are low-pressure. 2500psi is the highest I have
owned. Many are 2000psi or less.

If they are welded construction, the cylinder wall thickness can give you some indicator. I have measured
a low in the range of 0.17", all the way up to 0.30". The welded cyls I have bought have not been rated
lower than 3000 psi.

Then there is the internal seals, but that's getting into the weeds. Simple O-ring and scraper seals on
the piston, for example, will be found on lower pressure cyls, versus U-cup or other seals.

Finally, note that a lab test on a cyl will need to apply pressure that may be over 1.5x-2x the rated
pressure before you will see a failure.

Since this is a tractor site, note that most tractors owned by TBN members put out less than
3000psi. You usually have to go industrial or skid-steer to go higher.

 

[oldnslo]

You can get some idea, yes. The biggest factor is whether they are tie-rod or welded construction. Tie
rod cyls depend on the tie rods to keep the ends on, so they are low-pressure. 2500psi is the highest I have
owned. Many are 2000psi or less.

NFPA Tie rod cylinders are rated to 3000 PSI but are very rare in ag or construction equipment.

If they are welded construction, the cylinder wall thickness can give you some indicator. I have measured
a low in the range of 0.17", all the way up to 0.30". The welded cyls I have bought have not been rated
lower than 3000 psi.

Then there is the internal seals, but that's getting into the weeds. Simple O-ring and scraper seals on
the piston, for example, will be found on lower pressure cyls, versus U-cup or other seals.

Finally, note that a lab test on a cyl will need to apply pressure that may be over 1.5x-2x the rated
pressure before you will see a failure.

Since this is a tractor site, note that most tractors owned by TBN members put out less than
3000psi. You usually have to go industrial or skid-steer to go higher.

 

[J_J]

Prince Fortress Welded Cylinders

Has welded cyl rated at only 2500 and they also have TR/tie rod cyl rated at 3000 psi,

It would be hard to judge/determine by looking at a cyl.

Even testing a cyl might damage it.

Baileynet test their cyl at 1.5 times the psi rating.

I would guess the avg psi on tractors is about 2500 psi, maybe lower.