Exhaust system was replaced on this unit also, muffler had a hole in it blowing exhaust on radiator. while counterweight was off, radiator was blown out. Unit has been run without thermostat and the same problem exsist. Fan is on correctly and at the right angle. Temp is being checked with a mech. gauge. Unit has been drove without using the the paper roll clamp or the inching pedal. It does take longer for it to overheat at an idle. Timming is set at 8 degrees @ 700 rpm's. I have just about ruled out that this problem is comming from the engine. The transmission has only been serviced. I did find some rather large metal chewed up shims in the tranny strainer. I will have to get the pressure readings on the trans. I would like to at least rule out one of the two.