had two vac pumps now,my latest is a robinair,spec unkown 
they have both been pretty noisy and run very hot,im wondering if this is normal.
ive done a full oil change on the robinair using vac oil but it still makes a loud mechanical chugging noise and is very hot after about 15 minutes,im worried if i try and leave it running for an hour it may get TOO hot??
my bags arent very good at the moment and are almost certainly leaking a lot,i get new proper vac supplies this week,will the pump run better if the bag is 100% sealed or are they all just like this??
The pump will always run loud with leaks. Once there’s no more air to be removed from your layup, then the pump will quiet down. You should really try and get the bag sealed before running the pump any longer. It hurts the pump when it has to pull air constantly.
ok,that confirms what i was thinking,got new tape and bag fittings on the way 
will it also run cooler?