AZKAT,
The grease cups sit vertically just behind the hand wheel. You'll need a very short flat bladed screwdriver to unscrew them. Once the cups are out clean the old grease out if it's icky or just stick the lube tube up in the cup and fill it with new lube.
Then you should check the brushes too. Make sure they are still good, clean and not all oily. If so then after that, unlock the clutch so the hand wheel free wheels and put the hammer down. Run it till it it cleans itself out.
This I got from my LSMG.
Joe