Procedure 4.4 - Drive Belt Tensioning - Precor 9.17 Appendix

Procedure 4.4 - Drive Belt Tensioning

1. If the running bed is mounted in the treadmill, it may need to be moved slightly to gain
access to the upper surface of the drive belt. The drive belt tension test must be performed
in the center of the belt span between the drive roller pulley and the drive motor pulley.
2. If the running bed is mounted, running bed belt guides on the bottom of the running bed and
the screws that mount the running bed to the frame. Lift and slide the running bed just far
enough out of the right side of the running belt to expose the drive belt.
3. Place a belt gauge (Precor part # 20030-117 or equivalent) in the middle of the drive belt
and in the center of the belt span (see Diagram 5.3). Lay a straight edge along the length of
the belt and beside the belt gauge. Slide one of the o-rings up against the shoulder of the
belt gauge. Press downward on the belt gauge, causing the belt to deflect. Read the
deflection on the belt gauge at the edge of the straight edge. Deflect the belt 1/2". Read the
tension across the top edge of the o-ring. If the belt is correctly tensioned the gauge will
read between 14 and 16 pounds. See Diagram 4.3.
Diagram 4.3 - Drive belt Tension Gauge
15 lbs
1/2"
917, 917si Treadmillr
Page 14