Hi everyone, Brand new here and have a question. I recently bought 3 Gilmour sprinklers model 167SMB. When I hooked them up to my hoses, the sprinklers would not rotate and impulse. I figured the orifices were too large and therefore not enough pressure was being created to make them work, so I downsized all the nozzles to 3/32 and tried again....same problem. My supply hose is 3/4", and the system is running on a 1hp jet pump with a 20-40 pressure switch. Anyone any ideas as to what my problem ...
