Pro-Form Pro 16.9 User Manual page 33

HOW TO ADJUST THE DRIVE BELT
If the pedals slip while you are pedaling, even while
the resistance is adjusted to the highest level, the drive
belt may need to be adjusted. To adjust the drive belt,
first unplug the power cord.
Next, using a standard screwdriver, pry off the Shield
Cover (56) and slide it upward.
56
Then, remove the four M4 x 16mm Screws (not shown)
from the upper and lower ends of the Rear Shield (75),
and remove the Rear Shield.
75
Then, look between the Shields (73, 74) and locate the
M8 Locknut (102). Tighten the Locknut until the Drive
Belt (113) is tight.
73
When you have properly adjusted the drive belt, reat-
tach the rear shield and press the shield cover onto the
rear shield.
33
113
102
74