What should I do to prepare the TB30R for off-season storage?

You must either completely empty the fuel system or treat the gasoline with a fuel stabilizer to prevent gum deposits from forming in the carburetor. If emptying the system, drain fuel into an approved container outdoors, run the engine until it falters, then use the choke to exhaust all remaining fuel from the carburetor. Additionally, clean and lubricate the tractor thoroughly and store it in a dry, clean area away from corrosive materials such as fertilizer. (Page 25-26)