Precor Precision 400 Series Service Manual page 67

9. Press the RESET key to exit.
10. Switch the treadmill circuit breaker "OFF" and unplug the power cord from the wall out-
let.
Lift tube calibration
11. Hand rotate the lift tube clockwise as far as possible. With one hand hold the jacks-
cew from rotating while using the other hand to rotate the lift tube counterclockwise
until the distance from the top edge of the lift tube to the start of the jackscrew threads
is 1 in (2.54 cm). While rotating the lift tube, make sure that the lift motor jackscrew
does not rotate. If the jackscrew does rotate, repeat the adjustment process.
The jackscrew mounting hole may not exactly align with the frame mounting bracket
at the 1 in (2.54 cm) calibration distance. Rotate the tube in the direction that will
cause the least amount of rotation (least amount of jackscrew extension distance)
from 1 in (2.54 cm).
12. Replace the clevis and hitch pins.
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
5 Adjustment Procedures
Lift Motor Calibration
Page 60