Re: Hydraulic Cylinder Replacement?

Posted by Tom R on June 01, 1999 at 16:22:39 from (206.158.251.18):

In Reply to: Hydraulic Cylinder Replacement? posted by DaveB on June 01, 1999 at 14:58:07:

Dave:

Replacing two 2 inch dia. cylinders with two 3 inch dia. cylinders while keeping the flow rate (GPM) and system pressures the same will result in the following behavior when operating in the extending direction. The cylinders will move slower about 44% of the present speed, The larger cylinders are capable of more force (about 2.25 times more) than your present cylinders. This addition force may well cause failure in other parts of the loader, such as the loader frame or the pivot pins or pivot points where the bucket attaches.

Retracting charateristics would be similar, and could be calculated if you knew the rod size of the cylinders. But since you are working with smaller areas on the rod end the speeds would not be as slow or the forces as great as on the blind end of the cylinder.

These things should be considered before installing larger cylinders.

One final note: Cylinders are designed to operate at a maxium pressure, at that pressure the rod should not bend. Rod bending usually is caused by shock load, while the cylinder is not being powered or bottoming out on the clevis while being powered(where the rod end is traveling in an arc). I don't know about you but I have a bad habit of using my front end loader as a bulldozer, and ramming things with the bucket, that is the type of thing that usually causes rod bending.

Hope these comment will give you some things to consider.

Tom R.

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