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Good practice - 1st find out why it is hot...! Too much heat generated or too little of cooling...(dirty case)? If second - than you are on the right track (do the cooling)!

Why Hot is bad? For the bearing there is a limit from material(steel) heat threatment aspect (usually it is +150C(~300F)) Exceeding that metal loosed its heat treatment (gets softer and changed dimensions!). But usually there are way more things arund the bering that do not like to be even at these Temps (+150C(~300F)) - think lubricants and rubbers... 

Why cooling can be bad? If heat generation comes from bearing(or shaft) than cooling might do one potentially dangerous thing related to theremal expansion(compression) - if bearing inner ring(shaft) is hot(er) and you activelly cool outer ring (casing of machinery) - you will get reduction of bearing internal clearance to zero(or interference). Most of bearing types do not like that and might actually seize because of it...

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