Assembly; Attach The Chain Spreader - Chamberlain LiftMaster 3275C Owner's Manual

ASSEMBLY STEP 1
Attach the to the Motor Unit
To avoid installation difficulties, do not run the garage door
opener until instructed to do so.
• Remove the bolt and lock nut from the top of the motor unit.
• Place rail onto the bolt mounted on the motor unit and align
the back hole with the hole in the top of the unit.
• Fasten rail with the washered bolt and lock nut previously
removed. Tighten securely. Remember to use only these
bolts/fasteners! Any other bolts/fasteners will cause serious
damage to the opener.
• Cut tape from T-rail, chain and styrofoam.
• REMOVE STYROFOAM.
ASSEMBLY STEP 2

Attach the Chain Spreader

• Attach chain spreader to the motor unit with two screws.
• Position chain over chain spreader and into the slot of the
spreader. Wrap chain around the sprocket. If necessary, loosen
the outer nut on the trolley to obtain more chain slack.
Hex Screws
8-32x7/16
Chain
Spreader
Motor Unit
Sprocket
6
To avoid SERIOUS damage to garage door opener, use ONLY
those bolts/fasteners mounted in the top of the opener.
Lock Nut
T-rail
Hole
To avoid possible SERIOUS INJURY to fingers from moving
garage door opener:
• ALWAYS keep hand clear of sprocket while operating opener.
• Securely attach chain spreader BEFORE operating.
Washered Bolt
5/16"-18x1/2"
Styrofoam
Chain
Spreader
Motor Unit
Sprocket