Find Hunter sprinkler manuals on Hunter's website, hunterindustries.com/resource_guide/owners-manuals. The owner's manuals that are available are for the STK-1/STK-2 and STK-5V/STK-6V systems, as well as various controllers, remotes, sensors and central control systems.
When you get to the website, scroll to the section that is for owner's manuals and select the appropriate manual for the system which you own. It downloads to your computer for easy access. If you need owner's manuals for any of the other parts of the system, such as the controller or sensors, scroll down the main page until you find the section you are looking for and download the correct manual for your system.