I left the grate in my RT-340 for storage. The putty knife for scraping the drip pan lives there, and it’s a dry place to put my ThermoWorks thermometer unit if it is raining during a cook.
Assuming it is like the Bullseye, very small screws on the inside of the hopper. Just unscrew and take off. I left it off my Bullseye, just easier that way.