If you are able to run a 32 gpm single stage pump with 24hp. without reduced pressure it is probably because the pump is well worn. That is also probably the cause of over heating at high rpms.
At 1800 RPM and 3000 psi a gas motor wouldn't produce the power it needed to run it and it would stall. Your theory would work with a 1800 RPM electric motor.I see a few things must be clarified when determining hp. required to operate a hydraulic pump.
A combination of three things determine horsepower needed to operate, gpm , psi , and rpms. A pump rated at 20 gpms at 3600 rpms will produce only 10 gpm at 1800 rpms and will require less horsepower to operate. A pump rated at 3000 psi operated at 1500 psi will require half the horsepower.
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