I have several, two, sprinkler heads leaking while the system is in operation. It appears to be comming from around the pop up section of the rotating head.
How do i repair the leaking rotating head? It leakes only when in operation around the actual pop up head.
Rotors are not usually repairable on the component level. Sounds like your seal is worn out, which will happen after a period of time.
Find the same model, swap guts.
What model heads are they? I just had that problem with my Hunter PGP rotors. They Have been in the ground for about 9 years. They have some repair parts available but considering the age I just replaced them. Before you do anything take the heads apart and flush everything out with water. Sometimes debris can get into them and cause a leak at the seal. If that doesn't work then replace the bad heads.