Chamberlain PD220 - Fasten the Rail to the Motor Unit

6
Assembly
STEP 2 Fasten the rail to the motor unit
To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the
top of the opener.
1. Ensure that the chain spreader is installed. Insert a 1/4"-20x2" bolt and spacer into the cover
protection bolt hole on the back end of the rail as shown. Tighten securely with a 1/4"-20 lock nut.
DO NOT overtighten.
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.
HARDWARE
Bolt 1/4"-20x2"
Lock Nut 1/4"-20
Spacer
Self-Threading Screw
1/4"-20x1-3/4"
Cover Protection
Bolt Hole
Spacer
Bolt 1/4"-20x2"
Lock Nut 1/4"-20
Self-Threading Screws
1/4"-20x1-3/4"