Grinder Lubrication

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Any idea how often to change out the grease in the gear heads of a grinder?I have a DeWalt and Milwaukee and both users manuals are sketchy on details.I am a hobbiest user and occasionally use them heavily.  Your experiences?Thanks!
Reply:Take the 4 screws off the top and all I do is fill the gear box cavity by hand with bearing grease.And even then sometimes that 'aint enough......zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:I tend to do it after this happens.You get what you put in and people get what they deserve...
Reply:I don't do nothing and buy new ones when there on sale. No bearing grease would help what I put them through.I hate being bi-polar it's awsomeMy Heroes Have Always Been Cowboys
Reply:Thanks guys.I've been running mine on weekends - about once a month if I get the time and typically about two to three hours per day - all told about 40 hours per year.Have not checked the grease - been running with factory lube for about 3 years.Popped open the gear case after the motor burned out and a couple of teethwere half ground off.  Don't know if more frequent repacking would have helped.
Reply:It's pretty straight forward, I did mine a few years ago. Go for it, you'll figure it out.If you don't want to stand behind our Troops, feel free to stand in front of them.
Reply:The original lubrication is probably supposed to last the lifetime of the grinder. But on the other hand, manufacturers make money by selling new stuff, not by keeping the old ones alive longer... Might just have to open up my new Makita 5" grinder and have a look at how much grease the factory put in there.Another thing - what type of grease would be most suitable? Bearing grease should be designed mostly for roller bearings, not high speed sliding metal-to-metal contact as between gears.