Epson LQ-1150 User Manual page 52

2. Squeeze the tractor's lock tabs gently on both sides, and then
rotate the tractor up to pull it away from the printer.
3. Move the tractor forward to the mounting slot at the top of
the printer and tilt it into place as shown below. When you
push the tractor onto the posts, you should feel the notches
snap into place.
2-18
Using the Printer