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How wide is the bar? A 7' sickle bar mower can give a 25HP tractor a good load in tough grass. Hydraulic motors are rated as to HP, and how many cubic inches of oil are needed for each revolation of the motor. So you choose a motor of adequate HP, determine how fast it needs to run, multiply that times the cubic inches of oil the motor needs to turn one revolution, and convert that result to gallons per minute. Then, choose a pump that can deliver the GPM's needed at the RPM's you'll be running the pump. A motor of a given HP rating that has a low displacement per revolution will require more system pressure than a higher displacement motor, so you need to consider that when matching the pump, the motor, and the system relief valve. If you're going to use a valve in the system (rather than having it stop and start with the PTO lever), get a valve designed for motor use. Such a valve will have a detent to keep it "ON", and is "free wheeling" when shut off, which will let the mower coast to a stop, rather than abruptly stopping it, and risking motor, hose, or valve damage. Use a big reservoir, and also consider a cooler, if it is going to be used for hours at a time in hot weather. A good filter is important, also. Have you checked out: Link (They offer some degree of tech help.)
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