Was able to remove the fan by removing the three allen bolts. No special tools; just an orinary L-shaped hex wrench. (I guess the 260E has only three of these vs four as I read elsewhere.)
I was also able to download a diagram for how to thread the belt over the pulleys, as someone was good enough to post in another forum.
Looks like all the pulleys are pretty tight, though I only have 7, not 8 (no air pump). I was able to remove the belt only after it jumped the alternator pulley when my cleaning rag got caught in it
I recall yet another thread which said it can be replaced by loosening the alternator; since I have the fan and shroud off already, would that be preferable to loosening the tensioner?