Precor TRM 811.v2, Service Manual

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Running Belt Tracking Adjustment
CAUTION: 1) The tracking adjustments should only be done in 1/4 turn increments..
2) ONLY use the right side take up roller mounting bolt to adjust tracking.
3) ONLY use hand tools to adjust tracking, power tools may overtighten.
9. Replace the motor drive belt.
10. Start the treadmill and set the speed to 3 mph (5 kph).
11. Observe the running belt tracking while verifying that the belt remains centered::
a. If the belt starts to drift toward the right, slowly turn the right side take up roller mounting bolt
clockwise in ¼ turn increments until the drifting stops.
b. If the belt starts to drift toward the left, slowly turn the right side take up roller bolt
counterclockwise in ¼ turn increments until the drifting stops.