I have never worked on one, bolts do come loose from vibrations. Hopefully its nothing to be worried about after you tighten them up again.my owners manual had instructions on moving the rops forward so i did and changed the muffler fairly easy, but while i was in there i noticed some leaking and loose bolts on the right side drive , ill take the side cover off tomorrow and see if i can tighten the bolts and figure out why they came loose in the first place . i hope its not something to wrong with it, anyone here have experience with the case 1840.