Ragan 5" siezed

At least, I think that's it's name!
Anyway, when I am operating it in auto-traverse, it runs happily and then
the spindle suddenly siezes. I've disconnected the drive from the side-gear
train to the quick-change gear box on the front, and the lead screw/traverse
happily turns by hand. When the spindle is connected to just the idler, it
runs OK. Could it have anything to do with the locking nut for the
How do I take off the top of the housing around the spindle, to see where
it's siezing? I undid the top two (8"?) Alen-Key bolts, but it wouldn't
Where can I get a manual for it?
Thanks for your interest.
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