To adjust a Toto power gravity fill valve, follow these steps:
• Turn off water supply.
• Remove lid and rubber diaphragm from top of the tank.
• Locate adjustment screw located directly above the float cup assembly.
• Rotate clockwise to increase flow rate, counterclockwise to decrease it.
• Reinstall lid and diaphragm, turn on water supply and test for desired results.
By following these simple steps you can easily adjust your Toto power gravity fill valve as needed to maintain proper pressure in your toilet tank system.