Quinton ST 55, Service Manual

Page: 31 / 82

Cardiac Stress Treadmills Service Manual Repair/Replacement and Calibration 4-7
1. Remove the treadmill hood and power as described in “Removing the
Treadmill Hood” on page 4-3.
2. Remove the four screws and washers holding the resistors to the
headframe.
3. Unplug the resistor wire harness from the AC Drive Module.
4. Install the new resistors and replace the screws and washers.
5. Reconnect the wire harnesses to the AC Drive Module.
6. If no other service is required, replace the treadmill hood as described
in step 9 on page 4-3.
Replacing the Tensioner
The tensioner may need to be replaced if the poly-V drive belt slips, if the
idler pulley bearing makes noise, or if the tensioner roller is damaged.
Warning! Do not attempt to disassemble the tensioner. The internal
springs are tightly compressed and could cause injury if
released.
1. Remove the treadmill hood and power as described in “Removing the
Treadmill Hood” on page 4-3.
2. Use a 9/16 in. open end wrench to remove the 3/8 in. bolt from the
base of the tensioner. Remove and discard the old tensioner.
3. Be sure the drive belt is centered on the motor and roller pulleys.
4. Place the new tensioner onto the headframe in the same position as
before and loosely bolt it to the headframe.
3/8-16 x 2.50L Bolt
Split L.W.
Flat Washer
Large Nut 15/16
Alignment Marks
Tensioner
Poly-V Drive Belt