Nautilus T618 Service Manual page 84

9. Lift and pivot the Front Roller out of the Frame. This action will free the
Drive Belt with the Front Roller contained within the Walking Belt.
10. Slide the Front Roller out of the Walking Belt and replace with the new
Front Roller in the same orientation.
11. Insert the end of the Front Roller with the Drive Pulley into the Frame,
and pivot the other end into the Bracket.
12. Using a 6mm hex wrench, attach the Front Roller to the Bracket.
Note: Tighten the hardware until the Front Roller is centered in the Bracket.
13. Loop the Drive Belt around the Motor Pulley. Start the Drive Belt on
the Drive Pulley and roll it in a clockwise motion. Be sure the Belt does not
come off of the Motor Pulley.
Keep fingers out of any pinch opportunities when turning the
Pulleys.
14. Roll the Drive Pulley clockwise until the Drive Belt is fully installed.
Continue to roll the Belt forward while adding side pressure with fingers to
align as necessary.
15. With the Motor Assembly loosely attached to the Frame, turn the Belt
Tensioner Screw to the previous level. This will tighten the Drive Belt to the
previous tension level.
16. Using a 6mm hex wrench, fully tighten the screws that attach the Motor
Mount to the Frame.
17. Inspect the Speed Sensor to see if it has been moved during the
procedure. If necessary, adjust it to be the observed distance from the Drive
Pulley.
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Drive Pulley
Motor Pulley