Sizing a hydraulic motor

toxic · Jul 19, 2022

Got a question for those who are more informed. I am building a power rake for my ctl and am rather stumped as to which hydraulic motor I should get to power the drum. My skidsteer on the low flow side puts out 21.8 gpm at 3000 max psi. I want the drum to turn around 250rpm and of course use the most available power as possible. Most motors I've seen with the correct hp and rpm are not rated for the flow or psi that the skidsteer is capable of putting out?

KWentling · Jul 19, 2022

21.8x231/259=20.143 cubic inch per rev. is what you want if you are going to run the skid steer at rated rpm. There will actually be a little loss but you won't notice it. A pressure relief valve can be added if necessary.
This one is close.

oldnslo · Jul 19, 2022

In previous job we tested attachments on skid steers and found that most of them are optimistic on the amount of flow they produce at full pressure. I suspect the motor kwentling suggested would be a good fit.

MossRoad · Jul 19, 2022

toxic said:
Got a question for those who are more informed. I am building a power rake for my ctl and am rather stumped as to which hydraulic motor I should get to power the drum. My skidsteer on the low flow side puts out 21.8 gpm at 3000 max psi. I want the drum to turn around 250rpm and of course use the most available power as possible. Most motors I've seen with the correct hp and rpm are not rated for the flow or psi that the skidsteer is capable of putting out?

You can go over to Surplus Center website and plug those numbers into one of their free hydraulic calculators to determine what size motor you need to get those results. Then see if they have anything close.