Pro-Form 420 Ce Elliptical Manual page 22

HOW TO ADJUST THE DRIVE BELT
If you can feel the pedals slip while you are pedaling,
even when the resistance is adjusted to the highest
level, the drive belt may need to be adjusted.
Unplug the power adapter. To adjust the drive belt,
you must remove the top shield and the left shield (see
the instructions below).
Using a flat screwdriver, release the tabs on the front
and rear of the Top Shield (20) and then remove the
Top Shield.
20
18
90
93
93
19
90
93
90
Next, remove the M4 x 16mm Screws (93) and the M4
x 42mm Screws (90) from the Right and Left Shields
(18, 19). Make sure to note which size of Screw you
remove from each hole. Then, gently remove the Left
Shield.
Loosen the Pivot Screw (97). Then, tighten the Belt
Adjustment Screw (85) until the Drive Belt (38) is tight.
When the Drive Belt (38) is tight, tighten the Pivot
Screw (97).
Then, reattach the left shield and the top shield.
22
38
97
85