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Radiator fins can accumulate crud over time that a blower won't move. Take it out and jet wash on it ( very low pressure) then an airline to dry and clean. Happy to be contradicted but it worked on an occasionally overheating chipper I had.

I know many mini digger operators will operate with the capot open to aid cooling, but it's difficult to believe that an engine as big as that will overheat in summer without an underlying issue.

I'm presuming your chipper is air cooled Sean. If the engine covers are around the engine fins it may well be they're meant to be in place to use air flow around to cool.