the starter motor on my RB30 has jammed on a couple of times but so far has always eventually dis engaged
can I do anything to adjust or to lubricate it?
its an auto so I guess I cant rock car back and forth if it stays jammed
yes you can remove it and pull it down and clean etc, try spary crc in to the drive, this might help for a while
if it jams you can give it a tap with a hammer ....
as what moff_man said you can service it yourself free it up..
goodluck