LiftMaster Model 3280 1/2HP 3280-267 1/2HP GARAGE DOOR OPENER

LiftMaster Garage Door Opener Installation / Repair
Model 3280 1/2HP 3280-267 1/2HP GARAGE DOOR OPENER

ASSEMBLY STEP 1

Attach the Rail to the Motor Unit To avoid installation difficulties, do not run the garage door opener until instructed to do so.

Remove the two washered bolts mounted in top of motor unit.
Align rail and styrofoam over sprocket. Cut tape from rail, belt and styrofoam.
REMOVE STYROFOAM.
Insert washered bolts through the rail into the motor unit. Tighten bolts securely. Use only these bolts! Use of any other bolts will cause serious damage to door opener.
Position belt over the motor unit sprocket. To avoid SERIOUS damage to opener, ONLY use bolts/fasteners mounted in top of motor unit.

Set the Belt Tension

By hand, thread the spring trolley nut on the threaded shaft until it is finger tight against the trolley (Figure 1). Do not use any tools.
Insert a screwdriver tip into one of the nut ring slots and brace it firmly against the trolley (Figure 2).
Place a 7/16″ open end wrench on the square end. Rotate about 1/4 turn until the spring releases and snaps the nut ring against the trolley (Figure 3). This extends the spring for optimum belt tension.

Attach the Belt Cap Retainer

Position the belt cap retainer over the motor unit sprocket so the two holes in cap align with the two holes in mounting plate. Attach with 8×3/8″ hex screws provided.

You have now finished assembling your garage door opener. Please read the following warnings before proceeding to the installation section.

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