I have a 4 zone system with 4-5 sprinkler heads per zone. Last year 3 of the Rainbird impulse sprinklers on Zone 1 pop up and seems to have enough water pressure but they do not rotate as they should. I replaced all three last year and they seemed to be operating fine all summmer. I winterize all sprinklers last year as ususal. Last week I turned on sprinklers for first time and zone 1 was not working. After I found and repaired a leak on a craked valve manifold for zone all sprinklers heads ( r...
