Chamberlain 459950 Manual De Usuario

3

To prevent damage to garage door and opener:
•  ALWAYS disable locks BEFORE installing and 

operating the opener. 

•  ONLY operate garage door opener at 120V, 60 Hz to 

avoid malfunction and damage.

To prevent possible SERIOUS INJURY or DEATH:
•  ALWAYS call a trained door systems technician if 

garage door binds, sticks, or is out of balance. An 
unbalanced garage door may NOT reverse when 
required.

•  NEVER try to loosen, move or adjust garage door, 

door springs, cables, pulleys, brackets or their 
hardware, ALL of which are under EXTREME tension.

•  Disable ALL locks and remove ALL ropes connected 

to garage door BEFORE installing and operating 
garage door opener to avoid entanglement.

Before you begin:

• Disable 

locks.

•  Remove any ropes connected to garage door.

•   Complete the following test to make sure your garage 

door is balanced and is not sticking or binding: 

 

1.  Lift the door about halfway as shown. Release the 

door. If balanced, it should stay in place, supported 
entirely by its springs.

 

2.  Raise and 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.

During assembly, installation and adjustment of
the opener, instructions will call for hand tools as 
illustrated below.

Stepladder

Carpenter’s
Level (optional)

Tape Measure

Drill

Sockets and Wrench
1/2", 5/8", 7/16", 9/16" 
and 1/4"

Pencil

Wire Cutters

Pliers

Adjustable End Wrench

Claw Hammer

Screwdriver

Hack Saw

Drill Bits 
3/16", 5/16" 
and 5/32"