4-12 Repair/Replacement and Calibration Cardiac Stress Treadmills Service Manual
3. Disconnect the wire connector on the AC Drive Module.
4. Follow the procedure to remove the grade motor chain (see “Grade
Motor Chain” on page 4-13).
5. Remove the four 7/16 in. hex head nuts and bolts that attach the grade
motor to the headframe, then remove the motor.
6. Loosen the set screw in the grade motor chain sprocket and remove
the sprocket.
7. Install a new grade motor, following steps 3-6 in reverse order. Use a
straight edge to align the motor sprocket with the pinion shaft chain
sprocket.
8. Restore power to the treadmill and stress monitor and test the new
grade motor.
Warning! High voltage is present when the treadmill is plugged into a
power source. Secure loose hair, clothing, and jewelry
before working near rotating machinery.
Verify that:
a. the treadmill operates over the full range of 0-25% grade.
b. there is no binding when it moves up or down.
c. the chain is aligned correctly. A popping sound in the chain
indicates that it is misaligned.
9. Turn off the power to treadmill and stress monitor. Remove the power
cords from the outlets, then replace the treadmill hood as described in
step 9 on page 4-3.
Grade Motor Bolts
1/4-20 x 1.25L
Flat Washer
Kep Nut Far Side
Grade Motor
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