Posted by NC wayne on January 13, 2020 at 07:26:23 from (174.247.0.171):
In Reply to: hydralic cylinder posted by rick n ohio on January 12, 2020 at 17:18:46:
On a thumb cylinder you're not so much worried about the pressure the pump puts out as you are the pressure that will be caused in the cylinder if you curl the bucket into it. Both can blow seals, but the force generated from the bucket curling can easily bend the rod as well, if the relief doesn't pop first. I've seen it happen several times over the years.
With that in mind, the machine may run at XXX pressure, but you'll want to set the relief on the port going to the cylinder at no more than the pressure rating the cylinder is designed for.
Too, using generic numbers for an example, if you see you can use say a 2 1/2 inch cylinder at 3000 psi, I'd suggest stepping to a 3 inch at 2500. That will typically give you the strength of a larger rod diameter, and give you the power you need at a lower pressure, both of which are important on a thumb.
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