Assembly - Chamberlain Merlin MJ3800 Installation And Operating Instructions Manual

ASSEMBLY STEP 1
Attach the Collar to the Opener
To avoid installation difficulties, do not run the door
opener until instructed to do so.
• Loosen the collar screws.
• Attach collar to either the left or the right side of the
opener. 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 (Figure 2) to
secure collar to the opener (16Nm-19Nm of torque).
NOTE: For most installations the screws should be
facing up for easy access. Do not tighten set screws
until indicated.
ASSEMBLY STEP 2
Attach Mounting Bracket to Opener
• Loosely attach slotted side of mounting bracket
to the same side of the opener as the collar,
using self-threading screws provided.
NOTE: Do not tighten until instructed. Illustrations
shown are for left side installation.
HARDWARE SHOWN ACTUAL SIZE
Alternate Mounting Kit (NOT SUPPLIED):
This kit allows model MJ3800 to be
mounted below the torsion bar in the
case where the torsion bar is not
round or the normal mounting area
is obstructed.
G480LM
Screw
#10-32
To prevent possible SERIOUS INJURY or DEATH,
the collar MUST be properly tightened. The door
may not reverse correctly or limits may be lost
due to collar slip.
Right hand
installation
Figure 1
Figure 2
RIGHT
6
Left hand
installation
WRONG
Socket Wrench