Chamberlain LiftMaster PROFESSIONAL SECURITY+ 3800C Mode D'emploi page 6

ASSEMBLY STEP 1
Attach the Collar to the Motor Unit
To avoid installation difficulties, do not run the
garage door opener until instructed to do so.
• Loosen the collar screws.
• Attach collar to either the left or the right side of the
motor unit. Ensure that the collar is seated all the way
on motor shaft until stop is reached (Figure 1).
• Position the collar so that the screws are facing up
(accessible when attached to the torsion bar).
• Tighten both sides of collar screws equally to secure
collar to the motor unit (12-14 ft./lbs. of torque)
(Figure 2).
NOTE: For most installations the screws should be
facing up for easy access.
NOTE: Do not tighten set screws until indicated.
ASSEMBLY STEP 2
Attach Mounting Bracket to
Motor Unit
• Loosely attach slotted side of mounting bracket to the
same side of the motor unit as the collar, using self-
threading screws provided.
NOTE: Do not tighten until instructed.
NOTE: Illustrations shown are for left side installation.
HARDWARE SHOWN ACTUAL SIZE
All manuals and user guides at all-guides.com
Screw
#10-32
WARNING
To prevent possible SERIOUS INJURY OR DEATH, the collar
MUST be properly tightened. The door may NOT reverse
CAUTION
correctly or limits may be lost due to collar slip.
Figure 1
Figure 2
RIGHT
6
Collar Screw
Set Screw
Collar Screw
WRONG
Socket Wrench