Kyocera Ecosys P4040dn Operation Manual page 52

Paper Size Dial
Paper Size Window
If you are going to use paper that is longer than A4-R, pull the
cassette out until it stops at the back and then adjust the paper length
guide to the paper size required.
Note Paper sizes are marked on the cassette.
6
Turn the Paper Size Dial so that the size of the paper you are going
to use appears in the Paper Size Window.
Note When the Paper Size Dial is set to Other the paper size
must be set into the printer on the operation panel. Refer to
Cassette (1 to 5) Set. (Settings for the cassettes) on page 4-
32.
2-30
Preparation before Use