Sprinkler heads will need replacing from time to time, especially if they are accidentally hit by lawn mower blades. Before you change your sprinkler head, it is a good idea to inspect the spray body for damage. If the spray body is intact, only the spray head needs replacing. Most big-box home improvement centers carry the heads and spray bodies for many major manufacturers of sprinklers.
Turn off your sprinkler system until you complete the head replacement.
Dig around the sprinkler head with a hand garden shovel. Although this may take a little time, you will avoid accidentally damaging the sprinkler water line. Dig to a depth of 10 inches so that you can access the bottom of the sprinkler head without uncovering the water line.
Grab the spray body with both hands and twist the body counter-clockwise to remove it from the water line. Place a rag over the inlet portion of the line to prevent dirt from getting inside.
Twist the upper portion of the spray head counter-clockwise to remove it from the spray body. If the spray body has damage as well as the spray head, replace both with the same brand and type of spray head.
Slide the replacement head assembly into the spray body if you are not replacing the entire component. Twist the head clockwise to tighten the head assembly to the spray body.
Remove any loose dirt from around the inlet line and remove the rag you have covering the inlet port. Thread the spray body onto the inlet port.
Turn the sprinkler system on and check the spray and also check for leaks around the connection. Turn the sprinkler system off and place the soil back around the head.