I go through the most common reasons for overheating on an excavator. This one was bugging me because I could not find the reason for the longest time. I thought it was the waterpump, but soon found out it was in fact not. 1999 john deere 35 zts. The cooling system on this machine is the same for most machines around those years. The fan belt was spinning at all times, never had a problem with the alternator, leaving it hard to diagnose the problem. New crankshaft pulley and the problem went away.

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