Epson DFX-9000 Reference Manual page 144

6. Slide the two paper supports so they are spaced evenly
between the two sprockets.
Note:
When you use the paper with less than four inches wide, remove the
paper supports.
7. Fit the sprocket holes of the paper over the sprocket pins. If
there is slack in the paper or if the holes in the paper do not
align properly with the sprocket pins, pull the paper slightly
and use the pull tractor knob to adjust the position of the
paper as shown below. Slide the knob to the right first, and
then turn it as necessary.
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144
Options and Consumables
Caution:
Be sure the sprockets on the built-in front tractor and the
optional pull tractor are aligned.