g.p.m.

i`m sure some one here can tell me what the gpm flow rate should be to effectively run a hydraulic driven bush hog such as the skid steer type ?

https://www.surpluscenter.com/Hydraulics/Hydraulic-Motors/Low-Speed-High-Torque-Hydraulic-Motors/7-63-cu-in-PTO-Drive-Motor-BMSY125E2SLS-9-7368-125.axd

Example from Surplus Center.
They have several torque/rpm/Gomez models...seem to range 17-20 gpm

You need to know the flow rate(GPM) and pressure(PSI), of YOUR skid steer. Ot should be in your manual, or through your manufacturer. Once you have this info, go to Surpluscenter.com's websit, and go to their hydraulic formula tech pages. This will give you the hyd motor specifications, to make a decision as to which motor will fit your application...

This link takes you to their tech help calculator page, If you are still confused, I'd recommend that you give them a call, they are super-helpful, even if they don't have a product you may need, they still help, without any sales pressure...

https://www.surpluscenter.com/Tech-Help/Hydraulics/Calculators/Pump-Disp-HP-GPM-RPM/