Shimano STEPS EP800 Serie Gebrauchsanweisung Seite 66

INSTALLING THE DRIVE UNIT AND PERIPHERAL PARTS
Measuring and adjusting the chain tension
(2) Push TL-DUE60 up, and make it touch the chainring and rear sprocket.
Protrusion part
2.
Adjust the chain tension so that the head shaped part of the protrusion
part of TL-DUE60 is not hidden by the frame.
Protrusion part (head shaped part)
44