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Message: <blockquote data-quote="RodNH" data-source="post: 50874" data-attributes="member: 4512">@ OldMachinist:Thanks. The cooling fan is run by a variable speed hydraulic motor, the speed of which is determined by temperature signals from both the engine coolant and the hydraulic oil. If everything is working the way it should, I wouldn't expect any overheating of the hydraulic oil during engine operation at idle.@ jerry:That's interesting. I hadn't thought of the actual differences in revolutions over time. My S650 idles at 1350 rpm (spec is 1250-1450) and has a full throttle speed of 2600 rpm (spec is 2525-2650). That's a 1250 rpm difference that results in 75,000 less revolutions in every hour operating at idle, compared with operating at full throttle.What I don't know at this time is if the engine ever really gets up to normal operating temperature while operating at idle with only light loads. I've only got about 170 hours on the skid so far and have not really noticed what the temperature gauge says during extended idle - for example splitting wood for an hour. I'll have to check that out because I think repeatedly not getting up to normal operating temperature in a reasonable time is probably not good for the engine.</blockquote>