Craftsman 139.53675SRT - Manual (Page 3)

You'll Need Tools
During assembiy, instaliation and adjustment of the opener, instructions wili cail for hand ioois shnwrs 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,
caii for professionai 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 ioosen, move or adjust
them yourself!
Bopes left on a garage door could cause
someone to become entangled and killed.
Remove ail 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 6.
To avoid damage to the garage door and
opener, disable locks before Installing and
operating the opener. Use a wood screwr 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. •