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ASSEMBLY STEP 1
Fasten the Rail To the Power Unit
The Chamberlain Group, Inc.
Screw Drive LM 114A1794
Attaching Rail Assembly & Coupling to Chassis
NOTE: To aid in assembly and installation, replace
the foam packing around the power unit. Remove it
6/9/94 - 6/18/94 - 10/19/9
after Installation Step 5.
12/7/94
• 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
ASSEMBLY STEP 2
Install the 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.
Assembly Section: Pages 6 - 7
Rail
Assembly
Lock Nuts
1/4"-20
Opener
Chassis
Coupling
Rail
Sprocket
Foam Packaging
Hardware Shown Actual Size
Power Unit
Rail/Power Unit
Sprocket
Bracket
Hex Screws
1/4"-20x5/8"
1/4" - 20
1/4" - 20 x 5/8"
Lock Nut
Hex Screw
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