You can use this Hypro 1321-0007 Quick Coupler Pump Adapter to quickly attach a Hypro 1500, 1700, 7560, or 7700 Series Roller Pump with a 15/16" ID shaft to a 1-3/8" (6-spline) 540 RPM tractor PTO shaft with virtually no effort.
The Hypro 3430-0540 PTO Torque Arm Kit (sold separately) is recommended if you plan on driving one of the Hypro Series Roller Pumps mentioned above with a PTO shaft.