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Manual LiftMaster 8550 Garage Door Opener

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Manual

Safety Symbol and Signal Word

Review

This garage door opener has been designed and

tested to offer safe service provided it isinstalled,

operated,maintained and tested in strict

accordance with the instructions and warnings

contained in this manual.

When you see these SafetySymbols and Signal

Words on the following pages,they will alertyou to

the possibility of serious injury or death if you do

not comply with the warningsthat accompanythem.

The hazard may come from something mechanical

or from electric shock. Read the warnings carefully.

Mechanical

Electrical

When you see thisSignal Word on the following

pages, itwill alertyou to the possibilityof damage to

your garage door and/or the garage door opener if

you do not comply with the cautionary statements

thataccompanyit. Read them carefully.

Check the Door

To preventpossible SERIOUSINJURYor

DEATH:

l ALWAYS call a trained door systems

technician if garage door binds,sticks,

or isout ofbalance. An unbalanced

garage door may NOTreverse when

required.

l NEVER try to loosen, move or adjust

garage door, door springs,cables,

pulleys,brackets or their hardware,

ALLof which are under EXTREME

tension.

l Disable ALLlocks and remove

ALLropes connected to garage door

BEFORE installation and operating

garage door opener to avoid

entanglement.

To preventdamage to garage door and

opener:

l ALWAYS disable locks BEFORE

installing and operating the opener.

l ONLY operate garage door opener at

120V, 60Hzto avoid malfunction and

damage.

1. Disable locksand remove any ropes

connected to the garage door.

2. Lift the door halfway up.Release the

door.If balanced, it should stay in place,

supported entirely by itssprings.

3. Raise and lower the door to check for

binding or sticking. Ifyour door binds,

sticks, or is out of balance,call a trained

door systems technician.

4. Check the seal on the bottomof the door.

Any gap between the floor and the

bottom of the door must not exceed

1/4inch (6 mm).Otherwise, the safety

reversal system may notwork properly.

5. The opener should be installed above

the center of the door. Ifthere is a torsion

spring or center bearing plate in the way

of the header bracket, it maybe installed

within 4feet (1.2 m) to the leftor right of

the door center.See page 7.

Torsion

Spring

tension

Spring

Tools Needed

3/16

7/16

1/2

5/32

5/16

5/8

9/16

1/4

7/16

Preparation

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