Makita 8406C Gearbox oil
It uses grease to lube the gearbox. makita supply their own grease so you should be able to get a small tube from your local dealer. You don't have to use Makita grease though, just general grease should be fine. Not too thick and heavy, or too oily and light. I know that sounds a bit vague. Do you have other machines that you have grease for? SDS hammer drills, saws, any small power tool like that will use a similar type of grease.
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