Precor Precision 400 Series Service Manual page 176

5. Slide the stairarm pivot block onto the crankarm pin. Then install a flat washer, two
wave washers (2), and flat washer in that order onto the stairarm pin. Secure using
the retaining ring. Make sure that the retaining ring is properly seated in the crank pin
grooves.
6. Reinstall the Stairarm, see
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
"Stairarm Assembly Replacement" on
6 Available Replacement Procedures
Stairarm Pivot Block Replacement
page 163.
Page 168