Back in the day, adjusting your bike's chains was a chore that had to be done with annoying regularity. On a Pan or Knuckle, it takes about an hour or so to do the deed. You first have to loosen the transmission's four mounting nuts and one mounting bolt. Unfortunately, many a wrench has forgotten that one odd mounting bolt, which is over by the kicker cover, resulting in much distress and liberal amounts of verbal lubrication as he tries to get the still-bolted-to-the-frame transmission to move.
Once all the hardware is loosened, the transmission is slid back in the frame until the primary chain is properly adjusted. Once the transmission is again secured to the frame, you then loosen the rear axle and move the rear wheel to readjust the rear chain, since you screwed up its adjustment when you moved the transmission.
Once the chains are right, you have to readjust the rear brake rod, shifter rod, and, if equipped with a foot clutch, the clutch rod, because you changed their settings when you moved the transmission and rear wheel. Sounds like fun, eh?