Precor Precision 400 Series Service Manual page 67

12. Tighten and torque the step-up pulley left and right shaft nuts to 480 in-lbs (40 ft-lbs,
54.2 Nm). Re-check the belt tension. If the tension is not within limits, account for the
small change when tightening the shaft nuts and tension again accordingly until the
tension is within limits 230 Hz +/-10.
Belt Alignment and Tracking Adjustment procedure
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
5 Adjustment Procedures
Input Drive and Step-up Belt Tension Adjustment
Page 59