sprinkler head adjustment

[jimnvalk]

My mom has a sprinkler system, but one of the sprinklers is only covering about 160 degrees.  It needs to cover 180, how do you adjust these?  Thanks for your response.  This is a PUMA sprinkler head.

[2-CUP]

  HOLD THE STEM AND TRY TURNING JUST THE HEAD. THAT IS HOW MINE WORK.

[SideCar]

It depends on the model head. Some have a screw, flathead or allenhead, that adjusts how far it goes in one direction. The other direction is fixed, so you have to turn the whole sprinkler head to have the right start point on that side and you adjust the travel by turning the screw.