Oki ML5521 User Manual page 51

5. Open the tractor covers and place continuous forms paper on
the first two pins of either tractor, then close the left tractor
cover.
You must keep the number of paper holes engaged on either pin the
same. If you don't the paper will skew and jam.
6.
Adjust the position of the right tractor to centre the holes in
the paper on the pins. Then, close the right tractor cover and
push back the lock lever. Do not stretch the paper.
If the paper is too loose or too tight it can cause jams.
NOTE
MAINTENANCE > 51