Spirit CT900ENT Owner's Manual page 48

DO NOT OVER TIGHTEN – Over tightening will cause belt damage and premature bearing failure. If you
tighten the belt a lot and it still slips, the problem could actually be the drive belt (located under the motor
cover) that connects the motor to the front roller. If drive belt is loose it feels similar to the walking belt being
loose. Tightening the motor belt should be done by a trained service person.
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