Chamberlain 248730 - Manual (Page 7)

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.
To avoid possible SERIOUS INJURY to fingers:
l Securely attach chain spreader.
l NEVER connect garage door opener to power source until instructed to do so.
1. Insert a 1/4"-20x1-3/4" bolt 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. Remove the two bolts from the top of the motor unit.
3. Use the carton to support the front end of the rail.
4. Place the “U” bracket, flat side down onto the motor unit and align the bracket holes with the
bolt holes.
5. Fasten the “U” bracket with the previously removed bolts; DO NOT use any power tools. The
use of power tools may permanently damage the garage door opener.
6. Attach spreader to the motor unit with two screws.
(Mounted in the
Bolts
garage door opener)
HARDWARE
Bolt 1/4"-20x1-3/4"
Lock Nut 1/4"-20
“U” Bracket
Bolts
Hex Screws
8-32x7/16
Cover
Protection
Bolt Hole
Bolt
1/4"-20x1-3/4"
Lock Nut 1/4"-20