Preparing Your Garage Door; Tools Needed - Craftsman 139.53903DM Owner's Manual

Preparing your Garage Door
Before you begin:
• Disable locks.
• Removeany ropes connected to garage door.
• Completethe followingtest to make sure your garage door is
balanced and is not sticking or binding:
1. Lift the door about halfway as shown. Releasethe door. If
balanced, it should stay in place, supported entirely by its
springs.
2. Raiseand lower the door to see if there is any binding or
sticking.
If your door binds, sticks, or is out of balance, call a trained door
systems technician.
To prevent possible SERIOUSINJURYor DEATH:
• ALWAYScall a trained door systems technician if garage
door binds, sticks, or is out of balance.An unbalanced
garage door may not reverse when required.
• NEVERtry to loosen, move or adjust garage door, door
springs, cables, pulleys, brackets or their hardware, ALL of
which are under EXTREMEtension.
• DisableALL locks and remove ALL ropes connected to
garage door BEFORE installing and operating garage door
opener to avoid entanglement.
To prevent damageto garage door and opener:
• ALWAYSdisable locks BEFORE installing and operating the
opener.
• ONLYoperate garage door opener at 120 V, 60 Hz to avoid
malfunction and damage.
Sectional Door
One-Piece Door
Tools Needed
During assembly, installation and adjustment of the opener,
instructions will call for hand tools as illustrated below.
Stepladder
Level (optional)
Pencil
Tape Measure
Dr_ Wire Cutters
Drill 3/16", 5/16"
[_[_ and 5/32"
1/2", 5/8", 7/16", 9/16" Pliers
and 1/4"
Hack Saw
Screwdriver
Adjustable End Wrench