IBM 3 User Manual page 213

CAUTION:
<2-53> If the front tractor unit is not installed, make sure the gear
protector cover is closed. Do not touch inside the printer or insert any
object into the gears.
f. Close the gear protector cover and the front tractor cover.
5. Locate the push-pull selector next to the gears on the left side of the printer.
Push the push-pull selector down and toward the rear of the printer until the
Chapter 17. Setting Up Forms Paths
203