Nearly always this is a clogged radiator on the air side. See if you can shine a flashlight from the back side and see through every inch of the radiator. The 4110 used a pretty fine core, which is just perfect to collect certain types of fluff from mowing. As Galen said, clean it really well and see what it does. Unless you have blown a head gasket or cracked a head already, I bet it runs cool.
Exactly! Cleaning is the key. From operator standpoint, I'm always looking for easy way out. spent whole year cleaning and looking for "other " things. next season same thing.. I wrestled with problem spraying cleaning etc. heated it up once real hot. Sprung leak in radiator. probably from over heating. Sent it out to radiator guy to repair. Radiator came back as good and clean as new. Put back on in center of heat spell. Ran for 4 years now and nary even close to heat up, until this season. Screwed up and got in some high stuff with a lot of left over crap from old weeds. running hotter now, even after cleaning out. My experience says Dave is right on the money.
If I have to cut high stuff, I try to cut on wet day. Less dust. I've tried furnace filters in front of rad. not so good. Even tried cutting in reverse. Too hard to do big cut. After this seasons clog up, I was thinking cheese cloth might work. It would clog up fast, but save having inside fins clog. Maybe leave side panels off too as one person here suggested.
I was lucky I didn't hurt machine.
Good luck.....Coffeeman