4-8 Repair/Replacement and Calibration Cardiac Stress Treadmills Service Manual
5. Use either a 15/16 in. open-end wrench or a large adjustable wrench
to turn the
large nut on the tensioner counter-clockwise; put tension on
the poly-V drive belt until the two lines on the tensioner line up (see
figure below). Tighten the 3/8 in. bolt to 19 foot-pounds torque.
6. If no other service is required, replace the treadmill hood as described
in step 9 on page 4-3.
Replacing the Poly-V Drive Belt
1. Remove the treadmill hood and power as described in “Removing the
Treadmill Hood” on page 4-3.
Caution! The drive belt tensioner is spring loaded. Do not let it snap
closed after removing the drive belt.
2. Note where the tensioner marks are lined up.
3. Loosen the drive belt tensioner by turning the mounting bolt counter-
clockwise, then pivot the tensioner away from the belt.
4. Remove the drive belt from the drive pulley.
5. Loosen the roller guard screws.
6. Loosen tension on the walking belt as described in “Belt Tension” on
page 4-23.
7. Use a ½-inch socket wrench to remove the end caps from the
siderails.
8. Remove the plastic insert from the siderail cover.
9. Loosen the two siderail set screws on the pulley side only.
10. Slide the siderail cover backwards approximately 10 inches to expose
the two front-roller retainer bolts.
11. Use a ½-inch wrench to remove the four hex bolts that hold the two
front-roller retainers to the frame. There are two bolts on each side of
the roller.
12. Pull up the drive roller on the right side and remove the poly-V drive
belt from the roller.
13. Replace with a new belt then remount the front drive roller assembly.
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