It is a good idea to clearly designate the locations of the sprinkler heads using one of the choices available, such as marking flags or marking spray paint. If the device that aerates your lawn runs over a sprinkler head, there is a good risk that one of the tines that are located underneath the machine will make contact with the sprinkler head and cause it to become damaged. Before we begin aerating your grass, we always make sure to check the sprinkler heads on your irrigation system.