Справочник Пользователя для Chamberlain WD912K

9

• As a temporary stop, insert a screwdriver into the

hole in the front end of the rail.

• Slide the trolley assembly along the rail to the

screwdriver stop. NOTE: If trolley hits against any
nuts on the rail, the bolts and nuts were attached
from the wrong side and must be repositioned.
Review Assembly Step 1.

• Insert a 5/16"-18x7/8" hex bolt into the trolley stop

hole in the rail as shown. Tighten securely with a
5/16" lock washer and nut. This bolt limits trolley
travel in the DOWN direction.

Trolley

Temporary Stop
Screwdriver

Hex Bolt
5/16"-18x7/8"

Trolley
Stop Hole

Lock 
Washer
5/16"

Nut 
5/16"-18

• Place the opener on packing material to protect

the cover. For convenience, put a support under
the belt pulley bracket.

• Remove the two 5/16"-18x1/2" washered bolts

mounted in the top of the motor unit.

• Align the holes in the back section of the rail with

the holes in the motor unit.

• Fasten the rail with the two washered bolts

previously removed. Tighten securely.
Remember to use only these bolts! Any other
bolts will cause serious damage to the
opener.

• Insert a 5/16"-18x7/8" hex bolt into the cover

protection bolt hole in the rail as shown. Tighten
securely with a 5/16" lock washer and nut.

Washered Bolts
5/16"-18x1/2"

Cover Protection
Bolt Hole

Nut
5/16"-18

Hex Bolt
5/16"-18x7/8"

Lock Washer
5/16"

Nut
5/16"-18

Lock Washer
5/16"

Hex Bolt
5/16"-18x7/8"

To avoid serious damage to opener, ONLY use
bolts/fasteners mounted in top of motor unit.