Install The Trolley; Fasten The Rail To The Motor Unit - Chamberlain LiftMaster 311 El Manual Del Propietario

ASSEMBLY STEP 2

Install the Trolley

• Attach the trolley threaded shaft to the trolley with
the lock washer and nuts as shown.
• 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.
ASSEMBLY STEP 3

Fasten the Rail to the Motor Unit

• Remove the two washered bolts mounted in top of
motor unit.
• Position rail at an angle to opener so one hole in
rail and motor unit line up.
• Thread one of the washered bolts part way in.
Use only these bolts! Use of any other bolts will
cause serious damage to door opener.
• Align rail over sprocket. Cut tape from rail
and chain.
Temporary Stop
Screwdriver
Lock
Washer
5/16"
Outer Nut
5/16"
Trolley
WARNING
CAUTION
To avoid SERIOUS damage to garage door opener,
use ONLY those bolts/fasteners mounted in the top of
the opener.
USE ONLY THIS
TYPE AND SIZE
BOLT
9
HARDWARE SHOWN ACTUAL SIZE
Lock Washer
Nut
5/16"
5/16"-18
Inner Nut
5/16"
Trolley
Threaded
Shaft
Trolley
Washered Bolt
Motor Unit
5/16"-18x1/2"
Sprocket