Monday, Apr 07, 2008 at 21:58
not with todays Greases , some claim to have any heat / no liquid properties - , meaning your bearings will be glowing white before the grease liquifys (if at all ) then disperses - i have not seen this as yet - but have to presume truth in advertising.
as for packing the dust cover - it may be a waste of grease , but who will honestly be stingy enough to say that 30 mls of grease is an unexceptable waste of grease ? also , if this space is occupied with grease , it makes water and dirt ingress into this area a lot harder than if it was not packed with grease.... when you correctly pack bearings using the palm of your hand to force grease into the races - you will probably waste the same amount of grease that would be in the dust cap anyway ....
Another thing to think about is that providing you have a good seal in your cover - then once the grease heats up - it will expand , thus forcing its way into your bearings where an air pocket may be present , almost acting like the mechanical greasers you see on machinery with a preloaded spring and adjustable dispenser.
some machinery ( inc some new machinery ) still use a simple dust cap that you pack with grease and screw on to "inject" grease into bearings .... i have not seen these bearing produce excessing heat ? and this is going into a machine worth about $150 k ( one of the cheapest machines by far i have to maintain)
everyone will have a theory - greasing is not brain surgery --- having more grease than less will not create excessive heat - its a lack of lubrication that will produce heat ... grease often if in doubt - look for tell tale signs such as grease that goes off colour in a very short time ........
Boc
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