Replacing A Jammed Rack Gear - Cardiac Science ST 55 Service Manual

Replacing a Jammed Rack Gear

Remove the treadmill hood and power as described in
1.
page 5-4.
Block the headframe securely with wooden blocks to take the weight off the wheels.
2.
Shake each gear lightly at the top to determine which rack gear is jammed. If there is
3.
no play in a rack gear, it is jammed.
Remove the rack gear wheels from the rack gear. Note the arrangement of washers
4.
used as spacers.
Remove the side bumpers.
5.
Remove the poly-V drive belt from the motor pulley.
6.
Use a 9/16-inch socket wrench to remove the two hex-head bolts that hold each
7.
siderail to the headframe. Remove the deck assembly from the headframe.
Remove the grade pot bracket and assembly. Remove the four bolts that hold the
8.
handrail bracket in place and remove the bracket.
Slide the rack gear out sideways.
9.
Inspect the gear on the pinion shaft. If it is damaged, replace both the rack gear and
10.
the pinion shaft as described below.
Bolt the handrail bracket back into place.
11.
Reassemble the deck assembly and poly-V drive belt.
12.
Restore power and decrease the grade to run the other rack gear out the top.
13.
Reassemble the rack gear as described on
14.
Calibrate the grade potentiometer as described on
15.
Test the treadmill grade. Verify that:
16.
It operates over the full range of 0-25%.
a.
There is no binding when it moves up or down.
b.
The chain is aligned correctly. A popping sound in the chain indicates
c.
misalignment.
Turn the treadmill off and unplug it.
17.
Replace the bumpers.
18.
If no other service is required, replace the treadmill hood as described in
19.
page 5-4.
TM 55/65 Treadmill 4.0
Replacing a Jammed Rack Gear
Removing the Treadmill Hood
page 5-22.
page 5-37.
70-00298-01 A
on
step 9 on
5-23