Chamberlain 480LMC Installation

CARTON INVENTORY
1 T-bracket
2 1-1/4" Sprocket with Collar and Screws
3 1" Sprocket with Collar and Screws
4 Chain
5 Cover Assembly
NOT SHOWN
Hardware: 1/2" Screw (1),
#10 Self-Threading Screw (2),
and 1-1/2" Hex Head Screw (2)
Instructions
INSTALLATION
1. Disassemble kit and remove foam pad (attached to
sprocket hub). Discard foam pad.
2. Attach the T-bracket to the motor unit using the
self-threading screws (Figure 1).
NOTE: The T-bracket will be above the existing mounting
bracket.
3. Attach sprocket with larger bore (1-1/4") to the motor
shaft of the opener. Position the sprocket so that the
screws are facing up and are accessible when
attached to the torsion bar (Figure 2).
4. Tighten both sides of the sprocket screws equally to
secure the sprocket to the motor unit (12-14 ft./lbs.
of torque). Securely tighten set screw.
Models 480LM & 480LMC
Alternate Mounting Kit
To avoid possible SERIOUS INJURY to fingers from moving
garage door opener:
• Be sure power is not connected to the garage door opener
BEFORE installing the 480LM mounting kit.
• ALWAYS keep hand clear of chain and sprocket while
operating opener.
• Securely attach chain cover BEFORE operating.
5
2
1
(provided with opener)
Figure 1
3
4
5
Figure 2