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SW Ontario | I suspect (don't quote me) that the standard cooling on these machines is very adequate. I believe that the 8630 and 8640 have the same cooling systems, again don't quote me, and my 8640 has a kinze repower at 475 hp and the original rad keeps the gauge in the lower part of the green all the time. If it takes a while to get hot, I would check to make sure the rad is real clean...it is over sized for 275hp from my experience.
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JD 8630 Heating
