Craftsman 139.18473D User's Manual | Page 3

Craftsman Garage Door Opener User's Manual - 139.18473D.
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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.

Preparing your garage door 

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.

Tools needed

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

WARNING

CAUTION

WARNING

WARNING

WARNING

CAUTION

WARNING

WARNING

Pliers

Wire Cutters

Claw Hammer

Hack Saw

Screwdriver

Adjustable End Wrench

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

Drill

Tape Measure

2

1

Stepladder

Pencil

Drill Bits 
3/16", 5/16" 
and 5/32"

Carpenter's
Level (optional)

Sectional Door

One-Piece Door

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