Generally speaking, belt tracking issues are usually due to one or more of the shafts that support the pulleys not being perpendicular to each other - this applies to everything from treadmills to fan belts. Check and correct if possible: that the motor is securely mounted in the housing and that it is not installed crooked; and that the shafts aren't loose or have sloppy side to side movement. Belts should be tight - but not overly so.
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