Quinton TM55, Service Manual

Page: 42 / 82

4-18 Repair/Replacement and Calibration Cardiac Stress Treadmills Service Manual
7. Use a 9/16-inch socket wrench to remove the two hex-head bolts that
hold each siderail to the headframe. Remove the deck assembly from
the headframe.
8. Remove the grade pot bracket and assembly. Remove the four bolts
that hold the handrail bracket in place and remove the bracket.
9. Slide the rack gear out sideways.
10. Inspect the gear on the pinion shaft. If it is damaged, replace both the
rack gear and the pinion shaft as described below.
11. Bolt the handrail bracket back into place.
12. Reassemble the deck assembly and poly-V drive belt.
13. Restore power and decrease the grade to run the other rack gear out
the top.
14. Reassemble the rack gear as described on page 4-16.
15. Calibrate the grade potentiometer as described on page 4-26.
16. Test the treadmill grade. Verify that:
a. it operates over the full range of 0-25%.
b. there is no binding when it moves up or down.
c. the chain is aligned correctly. A popping sound in the chain
indicates misalignment.
17. Turn the treadmill off and unplug it.
18. Replace the bumpers.
19. If no other service is required, replace the treadmill hood as described
in step 9 on page 4-3.
Replacing the Pinion Shaft
1. Remove the deck assembly, (see “Removing the Deck Assembly
from Headframe” on page 4-22) then remove the rack gear as
previously described for jammed rack gears on page 4-17.