Chamberlain Whisper Drive SECURITY+ 459950 Manuel Du Propriétaire page 10

ASSEMBLY STEP 4
Install the Belt and Attach the Belt
Cap Retainer
1. Pull the belt around the idler pulley and toward the
trolley. The ribbed side must contact the pulley.
2. Hook the trolley connector into the retaining slot on the
trolley as shown.
3. With the trolley against the screwdriver, dispense the
remainder of the belt along the rail length toward the
motor unit and around the belt pulley. The belt pulley
teeth must engage the belt.
4. Check to make sure the belt is not twisted and the
FLAT side of the trolley threaded shaft is facing the
rail. Connect the trolley threaded shaft with the master
link, as illustrated:
• Push pins of master link bar through holes in end of
belt and trolley threaded shaft.
• Push master link cap over pins and past pin notches.
• Slide clip-on spring over cap and onto pin notches
until both pins are securely locked in place.
5. Insert the trolley threaded shaft through the hole in the
trolley. Be sure the belt is not twisted and the FLAT
side of the trolley threaded shaft faces the rail.
6. Hold the belt at the trolley shaft as you thread the
spring nut by hand onto the shaft until finger tight
against the trolley. Do not use any tools.
7. Remove the screwdriver.
8. Position the belt cap retainer over the motor unit belt
pulley as shown and fasten to the mounting plate with
8x3/8" hex screws provided.
Master Link
Clip-On Spring
Master Link Cap
T rolle y
Connector
Idler Pulley
Spring Nut
To avoid possible SERIOUS INJURY to fingers from moving
garage door opener:
• ALWAYS keep hand clear of belt pulley while
operating opener.
• Securely attach belt pulley cover BEFORE operating.
HARD W ARE SHOWN ACTUA L SIZ E
Hex Screw 8x3/8"
Spring/ T rolley Nu t
Pin
Notch
T rolle y
Master
Threaded
Link Bar
Shaft
Hole
Retaining
8x3/8" Hex Screws
Slot
10
Belt Cap Retainer
Motor Unit Belt Pulley
Mounting Plate