You'll Need Tools; Safety Information (Door Locks And Ropes); Testing Your Garage Door For Sticking, Binding And Balance - Chamberlain 1255GM Owner's Manual

During assembly, installation and adjustment of the opener, instructions will call for hand tools shown below.
Stepladder
WARNING
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.
Identify the type and height of your door, any special
conditions that exist, and any additional materials that
may be required, by referring to page 4.

You'll Need Tools

Carpenter's
Level
Drill
1/2" and 7/16" Sockets
and Wrench
SECTIONAL DOOR
Pencil
Tape Measure
Wire Cutters
3/16", 5/16" and
5/32" Drill Bits
Screwdriver
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.
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.
ONE-PIECE DOOR
3
Hack Saw
Claw Hammer
Pliers
Adjustable End Wrench
CAUTION
Test your Door