electric motor with hydraulic pump?

[LD1]

that was my gut, but i almost think i've seen used industrial units with 3hp motors. i may be way off on the pump too. to be honest, i'm not even sure if a 2 stage pump is a workable design. it just seems logical to me to be able to move the tool up to the work at a good rate of speed, and then have it kick down a gear to do the heavy lifting, so to speak. i need to find a way to get inside a machine to see what makes them tick i guess.

An industrial 3HP motor would only power about a 2 gpm pump @ 2500psi.

Industrial applications usually dont use 2 stage pumps.

The whole theory of using the 2 stage is to be able to use smaller engines and still get the fast cycle times, because it only has to slow down when the load exceeds 650psi(which is about 4 ton on a 4" cyl).

If you tried to run a straight 11 or 16gpm pump with a motor that is sized as above, You would over current your electric motor on enything needing more than 650psi to split. And if you used a gas motor, it would stall it.

On the flip side, to actually run a 11gpm single stage up to 2500psi, would require about 19 HP electrically, more for a gas motor. It wouldn't be very efficient, but it wouldn't slow to a second stage in the split either.