We have been having engine high temp problems with our Komatsu D51EX-22. It has a rear mounted radiator with a self reversing fan to purge out dirt and debree. Lately the fan has been surging, or speeding up and slowing down, periodically. When this happens the engine temp gradually builds up to around 200 degrees. If the engine RPM is reduced, and the heater is run, the temp will drop off some. The weather has been cool or mild. Temps from 40 to 70 degree F.
Komatsu D51EX-22 Dozer
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