LiftMaster J door operator - Manual (Page 10)

TROLLEY
10 Typical installation - Trolley
TYPICAL INSTALLATION
To prevent possible SERIOUS INJURY or DEATH:
• Header bracket MUST be RIGIDLY fastened to structural
support on header wall or ceiling, otherwise door might NOT
reverse when required. DO NOT install header bracket over
drywall.
• Concrete anchors MUST be used if mounting header bracket
or 2x4 into masonry.
• NEVER try to loosen, move or adjust door, springs, cables,
pulleys, brackets, or their hardware, ALL of which are under
EXTREME tension.
• ALWAYS call a trained door systems technician if door binds,
sticks, or is out of balance.
ATTENTION
AVERTISSEMENT AVERTISSEMENT
AVERTISSEMENT
WARNING WARNING
CAUTION
WARNING
WARNING
PRECAUCIÓN ADVERTENCIA
ADVERTENCIA ADVERTENCIA
1
Close the door. Mark the center of the door with a vertical line,
extend the line onto the ceiling.
INSTALL THE HEADER BRACKET
2
Open the door to the highest point of travel mark 4 inches
above the highest point of travel.
1
2
4
3
4"
5
The trolley operator is generally mounted over the center of the
door. However, off center mounting may be required due to
interfering structures or location of door stile / top section support.
Typically, the operator may be mounted up to 24 inches off
center on torsion spring doors. Extension springs require center
mounting.
3
4
Center the header bracket on the vertical center line and the
horizontal line.
Drill the pilot holes for the header bracket.
5
Fasten the header bracket with appropriate hardware
(not provided).