Fasten The Rail To The Motor Unit; Install The Idler Pulley - Chamberlain Whisper Drive Security+ HD800D 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.
Cover
Protection
Bolt Hole
Lock Nut
1/4"-20
Lock Washer
3/8"
HARDWARE SHOWN ACTUAL SIZE
Bolt 1/4"-20x1-3/4"
9
Bolts
"U" Bracket
Bolt
SLIDE RAIL TO STOPS
Lock Nut
ON TOP AND SIDES
OF BRACKET
Pulley
Idler
Bolt
Screwdriver
Nut 3/8"
Trolley
Connector
Lock Nut 1/4"-20 Nut 3/8"
Motor Unit
Sprocket
Foam Packaging
Bolt
Rail
Nut Washer
Bolt
Trolley
Stop Hole
Grease
Inside Pulley
Idler Pulley
Idler
Lock
Pulley
Nut
Lock Washer 3/8"