Hi, as Jim said rad cap, also check that water pump is not leaking down the front of the block. Also first thing in morning before starting the tractor, loosen the oil pan drain and make sure that there is no coolant coming out before oil. The older German Diesel had a problem with the O-rings at the bottom of the sleeves leaking. Does your 685 have a coolant filter to prevent sleeve cavitation? I know 95 series have it and it is supposed to be changed as per Operator;s manual.
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