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Manual LiftMaster 8550 Garage Door Opener

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Manual

Assembly

1 Attach the Rail to the Garage Door Opener

To avoid possible SERIOUS INJURY to finger from moving garage door opener:

l ALWAYS keep hand clear of sprocket while operating opener.

l Securelyattach sprocket cover BEFORE operating.

To avoid SERIOUS damage to garage door opener,use ONLY those bolts/fasteners mounted in

the top of the opener.

NOTE: ONLY use the bolts removed from the garage door opener. Place the garage door opener on

the packing material to prevent scratching.

1. Model 8550: Remove the two bolts fromthe top of the garage door opener.

Model 8557: Remove bolt and locknut fromthe top of the garage door opener.

2. Align the rail and the styrofoam over the sprocket.Cut the tape from the rail,belt, and

styrofoam.

3. Model 8550: Fasten the rail with the previously removed bolts.

Model 8557: Fasten the rail with the previously removed washered bolt and lock nut.

4. Position the beltaround the garage door opener sprocket.

5. Attach the sprocket cover over the garage door opener sprocket and attach with hex screws.

Model 8550

Model 8557

Washered Bolt

5/16"-18x1/2"

Hex Screw

#8x3/8"

Lock Nut

Washered Bolt 5/16"-18x1/2"

(Mounted in the garage

door opener)

Model 8550 (2)

Model 8557 (1)

Hex Screw

#8x3/8"

(Packed with the

sprocket cover)

Lock Nut

(Mounted in the

garage door opener)

Model 8557 (1)

Washered Bolt

5/16"-18x1/2"

Hex Screw

#8x3/8"

HARDWARE

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