You'll need tools, You'll need toots – Craftsman 1/2 HP GARAGE DOOR OPENER 139.53978SRT User Manual
Page 3
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You'll Need Tools
During assembly, installation and adjustment of the opener, instructions will call for hand tools shown below.
Locking pliers
Hack Saw
Claw Hammer
Screwdriver
Adjustable End Wrench
An unbalanced garage door might not reverse
when required and someone under the door
couid 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 yourseffl
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 and any
special conditions that exist and any additional
materials that may be required by referring to the
lists on page 4 or page 5.
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.