The size of the component ports is not as critical as the size of the lines between the ports.
Parasitic power loss in hydraulics is due to several factors, none of which are affected by the size of the tractor. Internal component leakage is the big one. Parts that are expected to move freely have clearance to do so, and that clearance allows fluid to leak from the high pressure side of the component to the low pressure side. Undersized lines can also contribute to parasitic power losses due to friction between the wall of the lines and the fluid itself. An excess of fittings, particularly the ones incorporating an angle for changing direction, will also contribute. The type of pump and/or motor is another source of power loss, with piston pumps/motors being the most efficient, and gear pumps/motors being the least. Piston to piston hydrostatic transmissions are the most efficient for transmitting power.
If the motor that you have is reversible, this valve
will give you bi-directional control with detents to hold the spool in position for working.
Pump > Control Valve > Reservoir Return
The two ports on top of the valve body go to the motor. The drain on the motor can be Teed into the return line.
The big advantage of a hydraulic PTO is that the motor can be installed directly on the implement without the need for a drive shaft. Quick connects installed on the back of the tractor allow the lines from the motor to be plugged into the work lines from the valve body.
Sizing the motor for a given implement is the important part, whether using a drive shaft from the rear PTO on the tractor, or hydraulic lines from the valve. The motor for the auger will turn considerably slower than the one needed for a finishing mower. Changing the motor displacement is a lot easier than building a gear box or chain reduction to accommodate implements with higher or lower rpm requirements.
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Sometimes you get on a roll, sometimes the roll gets on you.
MF GC2310, Husqvarna YTH20B42T
Down for Repairs
MF1655 w/ FEL, MF1655, MF12H, MF8H, MF7H
Spending too much time on MTF to work on my toys.