Sears 139.53930D owner manual Fasten the Rail to the Motor Unit, Install the Idler Pulley

ASSEMBLY STEP 2

Fasten the Rail to the Motor Unit

•Insert a 1/4"-20xl-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 NOTovertighten.

•Remove the two bolts from the top of the motor unit.

•Place the "U" bracket, flat side down onto the motor unit and align the bracket hole with the bolt holes. Fasten with the previously removed bolts.

•Align the rail assembly with the top of the motor unit. Slide the rail end onto the "U" bracket, all the way to the stops that protrude on the top and sides of the bracket.

•Attach spreader to the motor unit with two screws.

ASSEMBLY STEP 3

Install the Idler Pulley

To avoid SERIOUSdamageto garagedoor opener, use ONLY those bolts/fasteners mounted in the top of the opener.

Chain

Spreader

Motor Unit

Sprocket

"U" Bracket

\

\

N

Bolt

I

Protection

Cover

Bolt Hole

J Lock Nut

Bolt

Chain and

Cable

•Lay the chain/cable beside the rail, as shown. Grasp the end of the cable and pass approximately 12" (30 cm) of cable through the window. Allow it to hang until Assembly Step 5.

•Remove the tape from the idler pulley. The inside center should be pre-greased. If dry, regrease to ensure proper operation.

•Place the idler pulley into the window as shown.

•Insert the idler bolt from the top through the rail and pulley. Tighten with a 3/8" lock washer and nut underneath the rail until the lock washer is compressed.

•Rotate the pulley to be sure it spins freely.

•Insert a 1/4"-20xl-3/4 bolt into the trolley stop hole in

the front of the rail as shown. Tighten securely with a 1/4"-20 lock nut.