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Preparing your garage door, Tools needed – Chamberlain WHISPER DRIVE 248754 User Manual

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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.

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.

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.

Sectional Door

One-Piece Door

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"