Oki Microline Ml184T+ Handbook page 48

6. Adjust the left tractor if necessary; make sure it is not more than 12.7
mm (1/2 inch) from the left-hand end of the tractor unit. To move the
tractor pull the lock lever forwards, slide the tractor to the desired
position, then push it backwards to lock it in place.
7. Pull the paper under the column indicator and up to the level of the
tractor unit.
8. Adjust the right tractor to the paper width by pulling the lock lever
forwards, sliding the tractor to the right or left (depending on the pa-
per size), and pushing the lock lever backwards to lock it in place.
2 -- 26 Operating Your Printer
Lock lever
Sprocket cover
Tractor