Precor 9.31 Manual page 46

5. Slowly rotate the drive motor flywheel while pressing the drive belt off of the drive roller
pulley. Continue until the drive belt "walks" completely off of the drive roller pulley.
6. Using a fine tip marker or scribe, place a mark on the right hand drive roller mounting bolt
directly in front of the drive roller shaft. The bolt is being marked so that the drive roller can
be returned to the exact same position. The use of a fine marking line allows for more
accuracy when the replacement drive roller is installed.
7. Remove both drive roller mounting bolts. Remove the drive roller from the treadmill.
8. Slide the replacement drive roller into running belt and into the drive belt. Hand start both
drive roller mounting bolts.
9. Tighten the left hand drive roller bolt fully. The left hand side of the drive roller should be as
far forward as possible.
10. Tighten the right hand drive roller bolt until the mark placed on it in step 6 aligns with the
front edge of the drive roller shaft. Steps 8 and 9 should place the drive roller into its original
position and should now be square to the treadmill frame.
11. Slowly rotate the drive motor flywheel while pressing the drive belt onto of the drive roller
pulley. Continue until the drive belt "walks" completely onto the drive roller pulley. Be sure
that the drive belt is fully onto and correctly aligned on the drive roller pulley.
12. Alternate tightening the two take up roller mounting bolts, in order to tighten both ends
evenly, until both running belt gauges again read exactly 3%.
13. When both gauges again read 3% the belt is at its original tension. It will now be necessary
to touch up the running belt tracking, however if this procedure was carefully followed, the
belt tracking should be very close.
14. Remove both belt gauges from the running belt.
15. Start the treadmill and operate it at 2 m.p.h. Observe the running belt. If the belt drifts away
from its centered position re-track it by adjusting the take up roller mounting bolts as
described in step 16.
Drive Belt
Mark Bolt Here
Drive Roller Pulley
9.31, 9.33, 9.35 Treadmill
Page 46