Precor 9.31 Manual page 45

Procedure 6.10 - Drive Roller Replacement
This procedure is to be used to replace a drive roller while maintaining the drive belt's original
tensioning and the running belt's original tension and tracking settings. Two running belt gauges,
Precor part number 20007-101, are required. It is important that this procedure be followed to
maintain correct drive belt and running belt tension. When tension is removed from the running
belt, the belt requires 24 hours for it to "relax". If tension is removed from the belt and then
re-tensioned without following this procedure or allowing a 24 hour relaxation period, the running
belt may be over tensioned. Over tensioning the belt will lead to premature running belt wear,
premature driver roller bearing failure and premature take up roller bearing failure.
1. Place two running belt gauges on each side of the running belt, being sure that the gauges
are not across a belt seam. Set the gauges to the 3% mark as shown in the Illustration
below.
2. Once set the belt gauges can not be disturbed or moved, doing so will invalidate the tension
settings and necessitate a 24 hour relaxation period before the running belt can be
re-tensioned.
3. Remove the end caps from the rear of treadmill to expose the take up roller mounting bolts.
Remove the treadmill's motor cover.
4. Loosen, but do not remove the take up roller mounting bolts. The bolts are being loosened
to remove tension from the running belt.
9.31, 9.33, 9.35 Treadmill
Take Up Roller
Mounting Bolt
Page 45