Both of my 973 and my 963 run hot. I've washed out radiators to no avail. The 63 has a newer radiator which didn't help. Do they make a higher cfm fan or smaller pulleys to move more air in these things? I realize age has something to do with it but running yesterday it ran 230. I hate running them this hot. New radiators have gone threw the roof on prices so that is out of the question right now.
Condition of pulley and belt tensioners.? External or internal, or both.? What sort of temps are the hydraulics/power train running at.?
If you posted Serial Numbers I could take a look.........
What engine? If it's a 3306 the oil coolers plug up causing overheat.
Both 73's are 86g 00438 and the other is 01300's. The older one had a fresh motor put in around 5 years ago. Where is the oil cooler on them? Hydrostats will peg the needles also.
Are you simply relying on temp gauge readings, or have you shot temps with an infra-red heat gun.?
I have mechanical gauges on two and the stock gauge on the one I bought a year or so ago. I'll get a infra-red heat gun this weekend, maybe that will cure it . That is a good idea, thanks. The mechanical gauges I put on are reading right above the thermostat.
It will not cure anything but might just give more accurate information. Keep an eye on which temperature starts to skyrocket first, drive system or engine coolant. There is a possibility that you might just be looking in the wrong place for the source of your overheating.