Spirit CT900ENT Owner's Manual page 49

TREADBELT TRACKING ADJUSTMENT
The treadmill is designed so that the treadbelt remains reasonably centered while in use. It is normal for some
belts to drift near one side while in use, depending on a user's gait and if they favor one leg. But if during use
the belt continues to move toward one side, adjustments are necessary.
SETTING TREADBELT TRACKING
An 8mm Allen wrench is provided for this adjustment. Make
tracking adjustments on the left side bolt. Set the belt speed to
3 mph. Be aware that a small adjustment can make a dramatic
difference which may not be apparent right away. If the belt is
too close to the left side, then turn the bolt only a 1/4 turn to the
right (clockwise) and wait a few minutes for the belt to adjust itself.
Continue to make 1/4 turns until the belt stabilizes in the center of
the running deck.
If the belt is too close to the right side, turn the bolt counter-clockwise. The belt may require periodic tracking
adjustment depending on use and walking/running characteristics. Some users may affect tracking differently.
Expect to make adjustments as required to center the treadbelt. Adjustments will become less of a maintenance
concern as the belt is used. Proper belt tracking is an owner responsibility common with all treadmills.
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