anyone ever converted a standard 3pt post hole digger to hyd to run off of a hyd motor?have the a hyd motor i im told it puts out around 540 rpm at 18gpm,and where would you buy the couplers for the motor and post hole digger.i am thinking of mounting this using a 3pt adapter plate so i can still use this on my tractor with my rear hyd.i also have a shaft that goes on the motor that couples to a pto shaft they used the hyd motor and adaper on trucks to run a liquid pump for ammonia and fertaliser