Replacing The Grade Motor - Cardiac Science ST 55 Service Manual

Replacing the Grade Motor

Important: Place a clean sheet of cardboard or a clean rag on the treadmill deck before
starting this procedure.
Do not elevate the treadmill.
Block the treadmill headframe securely with wooden blocks to ensure that the
1.
treadmill will not drop when you remove the grade motor.
Remove the treadmill hood and power as described in
2.
page 5-4.
Disconnect the wire connector on the AC Drive Module.
3.
Follow the procedure to remove the grade motor chain (see
4.
Chain on page 5-18).
Remove the four 7/16 in. hex head nuts and bolts that attach the grade motor to the
5.
headframe, then remove the motor.
Loosen the set screw in the grade motor chain sprocket and remove the sprocket.
6.
Install a new grade motor, following steps 3-6 in reverse order. Use a straight edge to
7.
align the motor sprocket with the pinion shaft chain sprocket.
Restore power to the treadmill and stress monitor and test the new grade motor.
8.
WARNING! Electric shock hazard.
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:
The treadmill operates over the full range of 0-25% grade.
a.
There is no binding when it moves up or down.
b.
The chain is aligned correctly. A popping sound in the chain indicates that it is
c.
misaligned.
Turn off the power to treadmill and stress monitor. Remove the power cords from the
9.
outlets, then replace the treadmill hood as described in
TM 55/65 Treadmill 4.0
Replacing the Grade Motor
Removing the Treadmill Hood
Grade Motor
Grade Motor Bolts
1/4-20 x 1.25L
Flat Washer
Kep Nut Far Side
Replacing the Grade Motor
step 9 on page 5-4.
70-00298-01 A
on
5-17