Replacing The Grade Potentiometer (Pot) - Cardiac Science ST 55 Service Manual

Replacing the Grade Potentiometer (Pot)

Remove the treadmill hood and power as described in
1.
page 5-4. Use caution throughout the following steps.
Remove the two screws from the support bracket.
2.
Cut the cable ties.
3.
Unplug the cable from the AC Drive Module.
4.
Remove the setscrew on the gear wheel.
5.
Remove the nut holding the grade pot to the bracket.
6.
(Step 2)
Support Bracket Screws
6-32 x 1.25L
Flat Washer
Slip the grade pot out of the gear wheel and bracket.
7.
Replace with new pot:
8.
Slip the grade pot into the hole in the pot bracket, then into the gear wheel.
a.
Tighten the nut to 20 inch-pounds torque.
Use the two screws from step 2 to reinstall the pot bracket, engaging the gear wheel
b.
with the rack gear as you install.
Caution: Gear damage.
To prevent damage, don't mesh the gears too tightly. Leave enough clearance for each gear.
Be sure to leave the setscrew accessible and loose.
c.
See Grade Pot Wires
d.
Calibrate the grade pot as described on
9.
TM 55/65 Treadmill 4.0
on page 5-20.
page 5-37.
Replacing the Grade Potentiometer (Pot)
Removing the Treadmill Hood
Grade POT
Bracket
(Step 7)
Spur Gear
Grade POT
Nut (Step 6)
(Step 5)
Setscrew
10-32 x 0.25L
70-00298-01 A
on
5-19