Fasten Rail To Power Unit; Install The Trolley - Chamberlain Security+ 4620 Owner's Manual

ASSEMBLY STEP 2
Fasten the Rail To the Power Unit
and Install the Trolley
NOTE: To aid in assembly and installation, replace
/7/94
the foam packing around the power unit. Remove it
after Installation Step 5.
• Working on a level surface, align the rail assembly with
the power unit, as shown.
• Slip the coupling over the rail sprocket.
• Slide the rail through the power unit bracket until the
coupling fits securely over the power unit sprocket.
• Align the two screw holes in the rail with those in the
power unit bracket. Insert two 1/4"-20x5/8" hex screws
and lock nuts. Tighten securely with a 7/16" socket
wrench.
Trolley
As illustrated above, slide the trolley onto and along the
bottom of the rail until it snaps firmly in place. Be certain
to install it facing correctly: the trolley release arm must
be horizontal (lock position), with its arrow pointed
away from the power unit.
Power
Coupling
Rail
Sprocket
Rail
Assembly
10
Rail/Power Unit
Bracket
Lock Nuts
1/4"-20
Unit
Foam Packaging
Hardware Shown Actual Size
1/4" - 20 x 5/8"
Hex Screw
Power Unit
Sprocket
Hex Screws
1/4"-20x5/8"
1/4" - 20
Lock Nut