Fasten The Rail To The Motor Unit And Install The Idler Pulley - Chamberlain Whisper Drive Security+ 182671 Owner's Manual

ASSEMBLY STEP 2
Fasten the Rail to the Motor Unit
• Insert a 1/4"-20x1-3/4 bolt into the cover protection
bolt hole on the back end of the rail as shown.
Tighten securely with a 1/4"-20 lock nut. Do NOT
overtighten.
• Remove the two bolts from the top of the motor unit.
• Place the "U" bracket, flat side down, on the motor
unit and align the bracket holes with the bolt holes.
Fasten with the previously removed bolts.
• Align the rail assembly with the top of the motor unit.
Slide the rail end onto the "U" bracket, all the way to
the stops that protrude on the top and sides of the
bracket.
HARDWARE SHOWN ACTUAL SIZE
Bolt 1/4"-20x1-3/4"
ASSEMBLY STEP 3
Install the Idler Pulley
• Lay the belt beside the rail, as shown. Grasp the
end with the hooked trolley connector and pass
approximately 12" (30 cm) of belt through the
window. Keep the ribbed side toward the rail, and
allow it to hang until Assembly Step 5.
• Remove the tape from the idler pulley. The inside
center should be pre-greased. If dry, regrease to
ensure proper operation.
• Place the idler pulley into the window as shown.
• Insert the idler bolt from the top through the rail
and pulley. Tighten with a 3/8" lock washer and nut
underneath the rail until the lock washer is
compressed.
• Rotate the pulley to be sure it spins freely.
• Insert a 1/4"-20x1-3/4 bolt into the trolley stop hole
in the front of the rail as shown. Tighten securely
with a 1/4"-20 lock nut.
Idler Bolt
To avoid SERIOUS damage to garage door opener,
use ONLY those bolts/fasteners mounted in the top of
the opener.
Lock Nut
Lock Nut
1/4"-20
Idler
Bolt
Lock Washer
3/8"
HARDWARE SHOWN ACTUAL SIZE
Bolt 1/4"-20x1-3/4"
9
WARNING
CAUTION
Bolts
"U" Bracket
Bolt
Cover
Protection
Bolt Hole
SLIDE RAIL TO STOPS
ON TOP AND SIDES
OF BRACKET
Pulley
Nut
Screwdriver
Nut 3/8"
Trolley
Connector
Lock Nut 1/4"-20
Nut 3/8"
Motor Unit
Sprocket
Bolt
Rail
Washer
Bolt
Trolley
Stop Hole
Grease
Inside Pulley
Idler Pulley
Lock
Idler
Nut
Pulley
Lock Washer 3/8"