Chamberlain 248730 User Manual download pdf (Page 7)

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:

Securely attach chain spreader.

NEVERconnectgarage 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 boltsfrom 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

boltholes.

5. Fasten the “U” bracket with the previously removed bolts; DO NOT use any power tools.The

use of power tools may permanentlydamage 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

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Chamberlain 248730 User Manual Page 7