Chamberlain 9902 - Manual (Page 3)

3
Sectional Door
One-Piece Door
Pliers
Wire Cutters
Claw Hammer
Hack Saw
Screwdriver
1/2" & 7/16" Sockets
and Wrench
Drill
Tape Measure
1/2" x 7/16" Box Wrench
2 1
Stepladder
Pencil
3/16", 5/16" and
5/32" Drill Bits
Carpenter's
Level
During assembly, installation and adjustment of the opener, instructions will call for tools shown below.
An unbalanced garage door might not reverse when
required and someone under the door could be seriously
injured or killed.
If your garage door binds, sticks or is out of balance, call
for professional garage door service.
Garage doors, door
springs, cables, pulleys, brackets, and their hardware are
under extreme tension and can cause serious injury or
death. Do not try to loosen, move or adjust them
yourself!
Ropes left on a garage door could cause someone to
become entangled and killed. Remove all ropes
connected to the door before installing and operating the
opener.
To avoid damage to the garage door and opener, disable
locks before installing and operating the opener. Use a
wood screw or nail to hold locks in the "open" (unlocked)
position.
Operation at other than 120V 60 Hz will cause opener
malfunction and damage.
WARNING CAUTION CAUTION
Identify the type and height of your door, any special
conditions that exist, and any additional materials that
may be required. Refer to pages 6 and 7.
Test Your Door for Balance
Before you begin, complete the following test to make
sure your door is balanced, and is not sticking or
binding:
• Lift the door about halfway as shown. Release the door.
It should stay in place, supported entirely by its springs.
• Raise and lower the door to see if there is any binding
or sticking.
Safety Information, Precautions, Tools