Fasten The Rail To The Motor Unit; Install The Idler Pulley - Chamberlain Whisper Drive Security+ WD952KD 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.
Bolt
Cover
Protection
Bolt Hole
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
SLIDE RAIL TO STOPS
ON TOP AND SIDES
OF BRACKET
Bolt
Pulley
Nut
Washer
Screwdriver
Grease
Inside Pulley
Idler Pulley
Nut 3/8"
Trolley
Connector
Lock Nut 1/4"-20 Nut 3/8"
Motor Unit
Sprocket
Foam Packaging
Rail
Bolt
Trolley
Stop Hole
Lock
Idler
Nut
Pulley
Lock Washer 3/8"