Download Chamberlain HD220 Instructions / Assembly

Assembly
STEP 2 Fasten the rail to the motor unit
IMPORTANT: Use ONLY
the 1/4"-20x1-3/4"
self-threading screws
provided in a separate bag
inside the hardware bag.
To avoid SERIOUS damage to garage door opener, use ONLY the 1/4"-20x1-3/4" self-threading
screws provided.
1. Ensure that the chain spreader is installed.
2. Use the carton to support the front end of the rail.
3. Place the rail onto the motor unit. Align the screw holes in the rail with the holes on top of the
motor unit.
4. Fasten the rail with the screws; DO NOT use any power tools. The use of power tools may
permanently damage the garage door opener.
Chain Spreader
HARDWARE
Self-Threading Screw
1/4"-20x1-3/4"
6