Quinton ST 55 Service Manual page 46

Repa~irIReplacement and Calibration
- -
Method 2: Without Calipers
NOTE Both adjustment screws must be completely slack before starting
this procedure.
Use this method only if two belt adjustment calipers are not avail-
able. An accurate measuring device is required.
1. Turn both tension adjustment screws clockwise until most of
the slack is removed from the belt.
NOTE Do not stretch the walk belt at this point.
2. Place two pieces of masking tape or two light pencil marks on
the right edge of the belt exactly 50.000 inch apart.
3. Repeat Step 3 on the left edge of the belt.
4. Alternately turn the left and right adjustment screws one-half
turn until the distance between the tape or pencil marks is
50.203 inch (
-
+0.016) on both sides.
Camion
Do not overtighten the adjustment screws. Overtightening
/i\
may damage the walk belt and roller assemblies.
5. Remove the tape.
6. Adjust the walk belt tracking.
Walk Belt Tracking Perform this procedure:
whenever the belt moves to one side
after installing a new walk belt.
each time you adjust the walk belt tension.
WARNING
Do not stand on the belt when adjusting the tracking.
1. Adjust the walk belt tension as described on the previous page.
2. Start the treadmill and let it run for at least one minute at
minimum speed and grade. Do not start the treadmill when
someone is on the walk belt.
3. Make the following adjustment to the right adjustment screw
only:
a. If the belt moves to the right, turn the screw
1/4
turn clock-
wise.
b. If the belt moves to the left, turn the screw
1/4
turn counter-
clockwise.
4. Run the treadmill for at least one minute to observe the track-
ing. Adjustments to belt tracking take some time to become
apparent.
5. Repeat Steps 3 and
4 as required.
Caution
Do not overtighten the adjustment screw. Overtightening
can damage the walk belt and assemblies.