You can download an owners manual on the Scag site, should give ya instructions.
But basically, just drain the tank and replace the filter. Refill and your good to go.
Any more then that, and it gets a little complicated. The above is all ya need to do.
" But let me tell you something ,folks: You can't fix stupid! There's not a pill you can take, there's not a class you can go to. Stupid is forever!"