Tighten The Belt And Install The Sprocket Cover; Installation - Chamberlain Whisper Drive Security+ 459950 Owner's Manual

ASSEMBLY STEP 5
Tighten the belt and install the sprocket
cover
1. Spin the inner nut and lock washer down the trolley
threaded shaft, away from the trolley.
2. To tighten the belt, turn outer nut in the direction
shown until the line on the spring retainer plate is
visible. Be sure the belt is not twisted, and the ribbed
side faces the rail.
3. Tighten the inner nut to secure the adjustment. This
sets the spring to optimum belt tension.
4. Position the sprocket cover over the sprocket as shown
and fasten to the mounting plate with 8x3/8" hex
screws provided.
You have now fi nished assembling your garage door
opener. Please read the following warnings before
proceeding to the installation section.

INSTALLATION

IMPORTANT INSTALLATION INSTRUCTIONS
To reduce the risk of SEVERE INJURY or DEATH:
1. READ AND FOLLOW ALL INSTALLATION
WARNINGS AND INSTRUCTIONS.
2. Install garage door opener ONLY on properly
balanced and lubricated garage door. An improperly
balanced door may NOT reverse when required and
could result in SEVERE INJURY or DEATH.
3. ALL repairs to cables, spring assemblies and other
hardware MUST be made by a trained door systems
technician BEFORE installing opener.
4. Disable ALL locks and remove ALL ropes connected
to garage door BEFORE installing opener to avoid
entanglement.
5. Install garage door opener 7 feet (2.1 m) or more
above fl oor.
6. Mount the emergency release within reach, but at
least 6 feet (1.8 m) above the fl oor and avoiding
contact with vehicles to avoid accidental release.
7. NEVER connect garage door opener to power source
until instructed to do so.
WARNING WARNING
8. NEVER wear watches, rings or loose clothing
while installing or servicing opener. They could be
caught in garage door or opener mechanisms.
9. Install wall-mounted garage door control:
• within sight of the garage door.
• out of reach of children at minimum height
of 5 feet (1.5 m).
• away from ALL moving parts of the door.
10. Place entrapment warning label on wall next to
garage door control.
11. Place manual release/safety reverse test label in
plain view on inside of garage door.
12. Upon completion of installation, test safety reversal
system. Door MUST reverse on contact with a
1-1/2" (3.8 cm) high object (or a 2x4 laid fl at) on
the fl oor.
13. To avoid SERIOUS PERSONAL INJURY or DEATH
from electrocution, disconnect ALL electric and
battery power BEFORE performing ANY service or
maintenance.
11
Outer Nut
Inner Nut
Lock Washer
Line
CORRECT
Line
INCORRECT
Sprocket Cover
Spring Retainer
8x3/8" Hex Screws
Sprocket
Mounting
Plate