Reassembling The Rack Gears - Cardiac Science ST 55 Service Manual

Repair/Replacement and Calibration

Reassembling the Rack Gears

Install new rack gears at the same time so that they extend an equal distance through the
headframe.
Restore power to the treadmill.
1.
Loosen the setscrew that secures the grade potentiometer gear and remove the gear.
2.
Insert rack gears into headframe.
3.
Decrease the grade until the gears bounce two or three times, then increase the grade.
4.
This should cause both rack gears to mesh in exactly the same place.
Run the rack gears down past the bottom of the headframe. Hold the limit switches
5.
closed to let the rack gear travel beyond its normal lower limit.
Check below the headframe to verify that the rack gears are meshing properly. The
6.
gears should protrude an equal distance.
Run the rack gears down until there is enough room to replace the wheels.
7.
Bolt the wheels to the rack gears.
8.
Replace washers used as spacers in the correct arrangement.
a.
Torque the bolts tightly to 46 ft-lb ±4 ft-lb.
b.
Increase the grade until the wheels touch the floor.
9.
Grease the rack gears with wheel bearing grease.
10.
Remove the blocks that support the headframe.
11.
Reinstall the grade pot bracket and assembly.
12.
Calibrate the grade potentiometer as described on
13.
If no other service is required, turn the treadmill power off, remove the power cord
14.
from the outlet, and replace the treadmill hood as described in
70-00298-01 A
5-22
TM/ST55
TM/ST65
Leftside Limit Switch Locations
page 5-37.
step 9 on page
TM 55/65 Treadmill 4.0
5-4.