Chamberlain WHISPER DRIVE 248754 - Manual (Page 3)

3
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"