Install The Belt And Attach The Belt Cap Retainer - Chamberlain Whisper Drive Security+ WD912KS Owner's Manual

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 pliers, dispense the
remainder of the belt along the rail length toward
the motor unit and around the sprocket. The
sprocket teeth must engage the belt.
4. Check to make sure the belt is not twisted, then
connect it to the flat end of 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
ribbed side 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 locking pliers.
8. Position the belt cap retainer over the motor unit
sprocket as shown and fasten to the mounting
plate with 8x3/8" hex screws provided.
To avoid possible SERIOUS INJURY to fingers from
moving garage door opener:
• ALWAYS keep hand clear of sprocket while operating
opener.
• Securely attach sprocket cover BEFORE operating.
Master Link
Clip-On Spring
Master Link Cap
Retaining
Slot
Trolley
Connector
Idler Pulley
Spring Nut
10
WARNING
CAUTION
HARDWARE SHOWN ACTUAL SIZE
Hex Screw 8x3/8"
Spring/Trolley Nut
Pin
Notch
Trolley
Master
Threaded
Link Bar
Shaft
Round
Hole
Belt Cap
Retainer
Hex Screws
#8x3/8"
Motor Unit
Sprocket
Mounting
Plate