Quinton TM55, Service Manual

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Cardiac Stress Treadmills Service Manual Repair/Replacement and Calibration 4-17
5. Run the rack gears down past the bottom of the headframe. Hold the
limit switches closed to let the rack gear travel beyond its normal
lower limit.
6. Check below the headframe to verify that the rack gears are meshing
properly. The gears should protrude an equal distance.
7. Run the rack gears down until there is enough room to replace the
wheels.
8. Bolt the wheels to the rack gears.
a. Replace washers used as spacers in the correct arrangement.
b. Torque the bolts tightly to 46 ft-lb
±
4 ft-lb.
9. Increase the grade until the wheels touch the floor.
10. Grease the rack gears with wheel bearing grease.
11. Remove the blocks that support the headframe.
12. Reinstall the grade pot bracket and assembly.
13. Calibrate the grade potentiometer as described on page 4-26.
14. If no other service is required, turn the treadmill power off, remove
the power cord from the outlet, and replace the treadmill hood as
described in step 9 on page 4-3.
Replacing a Jammed Rack Gear
1. Remove the treadmill hood and power as described in “Removing the
Treadmill Hood” on page 4-3.
2. Block the headframe securely with wooden blocks to take the weight
off the wheels.
3. Shake each gear lightly at the top to determine which rack gear is
jammed. If there is no play in a rack gear, it is jammed.
4. Remove the rack gear wheels from the rack gear. Note the
arrangement of washers used as spacers.
5. Remove the side bumpers.
6. Remove the poly-V drive belt from the motor pulley.
Leftside Limit Switch Locations
TM/ST55
TM/ST65