ProForm 520 User Manual page 23

HOW TO LOWER THE TREADMILL FOR USE
1. Hold the upper end of the treadmill with your right hand
as shown. Using your left hand, pull the latch knob to the
left and hold it. Pivot the treadmill down until the frame is
past the latch pin. Slowly release the latch knob.
2. Hold the treadmill firmly with both hands, and lower the
treadmill to the floor. Do not drop the treadmill frame
to the floor. CAUTION: To decrease the possibility of
injury, bend your legs and keep your back straight.
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Latch
Open
Knob
Pin
Catch