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Message: <blockquote data-quote="billrbg" data-source="post: 83551" data-attributes="member: 10970"><p>I finally got around to opening the chain-case today and bailing out the old oil, now I have a few questions: 1) Those two big disks, with the square drive, are really floppy. Not radially, but side-to-side, since they are fairly thin and have no real hub. I'm thinking those are rotors for the parking brake and I shouldn't be too concerned about them, correct? 2) The chains are fairly loose, about 2.375" from "full up" to "full down" with the other side of the chain tight. I'm talking about just the front chains, of course, the ones that are easy to see with the case cover off. Considering the size of those chains, the operating speed, and that slack is the same on both sides, I intend to leave them alone unless somebody can suggest a critical reason to fuss with them. 3) There are white plastic blocks/guides under each chain. Those blocks are each attached to a single large screw. One block is tight, but the other can be easily rotated a few degrees. What am I looking at there? Are those blocks supposed to be loose or tight? Do I need to adjust them???</p></blockquote><p></p>