Craftsman 139.18987 Owner's Manual download pdf (Page 4)

Safety Reversing Sensor

Horizontal and vertical reinforcement

is needed for lightweight garage doors

(fiberglass, steel, aluminum, door

with glass panels, etc.).

See page 24 for details.

FINISHED CEILING

Support bracket &

fastening hardware

is required.

See page 17.

Door

Center

Safety

Reversing

Sensor

Floor must be level

across width of door.

Header Wall

Access Door

Extension

Spring

Torsion

Spring

— — — — — — — —

Header

Wall

Garage

Door

Header

Bracket

Trolley

Straight

Door

Arm

Emergency Release

Rope & Handle

Door

Bracket

Curved

Door

Arm

Garage

Door

Spring

Belt

Closed Position

Trolley

Stop Bolt

Before you begin, survey your garage area to

see whether any of the conditions below apply

to your installation.

Based on your particular requirements, there are

several installation steps which might call for

materials and/or hardware not included in the carton.

• Step 1, page 12 - Look at the wall or ceiling above

the garage door. The header bracket

must

securely fastened to structural supports.

• Step 5, page 17 - Do you have a finished ceiling in

your garage? If so, a support bracket and

additional fastening hardware may be required.

• Safety reversing sensor, page 21 - Depending

upon garage construction, wood blocks or

extension brackets (see Accessories page 38)

may be needed to fasten sensors to mounting

locations.

• Step 10, page 22 - Floor mounting of the safety

reversing sensor will require hardware not

provided.

• Step 11, page 24 - Do you have a steel, aluminum,

fiberglass or glass panel door? If so, horizontal

and vertical reinforcement is required.

• Look at the garage door where it meets the floor.

It must close on the floor all the way across.

Otherwise, the safety reverse system may not

work properly. See page 30. Floor or door should

be repaired.

• An 8 foot high door will require Item No. 18768

Rail Extension Kit. A 10 foot high door will require

Item No. 18770 Rail Extension Kit.

SECTIONAL Door Installation

• The opener can be installed within 4 feet to the left

or right of the door center if there is a torsion spring

or center bearing plate in the way of the header

bracket or door bracket area.

If your door has

extension springs, the opener must be installed in

the center of the door.

See pages 12 and 24.

• Do you have an access door in addition to the

garage door? If not, Model 18752 Emergency Key

Release is required. See page 38.

You may find it helpful to refer back to this page as

you proceed with the installation of your opener.

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Craftsman 139.18987 Owner's Manual Page 4

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