Assembly; Attach The Rail To The Motor Unit - Chamberlain 2575C Owner's Manual

ASSEMBLY STEP 1
Attach the T-Rail 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
WARNING
CAUTION
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
WARNING
To avoid possible SERIOUS INJURY to fingers from
moving garage door opener:
CAUTION
• 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