Cardiac Stress Treadmills Service Manual Repair/Replacement and Calibration 4-27
5. Loosen the screw that holds the grade pot sprocket to the grade pot.
This may require removing, then replacing the two Phillips screws
from the pot assembly bracket.
6. Place a flathead screwdriver through the handrail bracket and turn the
pot shaft until the stress monitor displays zero grade.
7. Position the bracket so that the gear is meshed with the rack gear teeth
(see illustration below) and tighten the screws loosened in step 5.
Caution! To prevent damage when replacing the bracket, don’t mesh
gears too tightly. Leave 1/16 in. clearance for each gear.
8. Verify that the treadmill operates through its full grade range (0 –
25%) and that the treadmill is nearly all the way to the top of the rack
gear when the display reads 25%.
9. Turn off the power and disconnect the power cord from the power
outlet.
10. Unplug the treadmill. If no other service is required, replace the
treadmill hood as described in step 9 on page 4-3.
11. Reinstall the siderails and bumpers, if previously removed.
Speed and Grade
The circuitry in the treadmill is self-calibrating for speed and grade. No
additional calibration is required.
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