Fasten The Rail To The Motor Unit - Chamber LiftMaster Professional SECURITY + Manual Del Usuario

ASSEMBLY STEP 3

Fasten the Rail to the Motor Unit

• Place the opener on packing material to protect the
cover. For convenience, put a support under the chain
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.
NOTE: This bolt prevents trolley over-travel. Keep a 25 mm
minimum between the trolley and this bolt when adjusting
travel limits (see page 29).
Model 1225EM Only: Attach chain spreader with #8x1"
hex screws and washers as shown.
HARDWARE SHOWN ACTUAL SIZE
Hex Bolt
5/16"-18 x 7/8" Nut 5/16"-18 Lock Washer 5/16"
To avoid serious damage to opener, ONLY use bolts/fasteners
mounted in top of motor unit.
MODEL 1225EM ONLY
MODEL 1220EM
ONLY
Washers
Washered Bolt
5/16"-18x1/2"
Hex Bolt
5/16"-18x7/8"
Cover
Protection
Bolt Hole
Rail
(Back
Section)
Lock Washer
5/16"
Nut
5/16"-18
12
#8x1"
Hex Screws
Chain
Spreader
USE ONLY THIS
TYPE AND SIZE
BOLT