Prepare & Test The Door - Chamberlain LM550EVGBSA Installation And Operating Instructions Manual

TESTING THE DOOR
4
Complete the following test to ensure your door is well
balanced, and not sticking or binding:
• Disable all locks and remove any ropes connected to the
garage door.
• Lift the door to about halfway and then release it. The
door should remain spring balanced.
• Raise and lower the door to determine if there are any
sticking or binding points (15 kgf is the absolute maximum
allowable to raise or lower the door in any position).
• If your door does not hold in place or the door binds or
sticks, call a qualified door technician before installing the
opener.
• Depending on the door performance, a weight bar at the bottom edge of the door might be required.
Use a metal bottom edge, which serves as a weight bar.
INSTALLING THE STOP COLLAR
5
• Install the stop collar on the opposite end to where
the opener is to be installed.
• Fit the stop collar hard against the boss of the door
drum. Ensure the U-bolt holding the door shaft to the door
bracket is tightly secured.
6
6 INSTALLING DRIVE LEG EXTENSIONS
Insert the drive leg extensions into the drive legs
and fix them using screws provided.
Non opener side
SAFETY CHECK!
Is the stop collar
installed?
YES: proceed to the next
step
NO: install the stop collar
before proceeding
5
Opener side