To avoid installation difficulties, do not run the, Assemble the rail and attach the pulley bracket, Assembly step 1 – Craftsman 1/2 HP GARAGE DOOR OPENER MODEL 139.5364812 User Manual

Page 8

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Assemble the Rail and
Attach the Cable Pulley Bracket

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

1. Align the three rail sections on a flat surface

exactly as shown. Front and back sections are

interchangeable for ease of assembly.

2. Insert the carriage bolts so the

square bolt necks seat in the square

holes in the rail sections and pass

through the round holes in the center
section rail. Make sure bolt necks
are seated in the square holes and

rails are aligned before you tighten
lock nuts. Improper assembly can

cause Jerky trolley operation, noise
and/or nuisance door reversals.

3. Assemble lock nuts, ensure

alignment and tighten.

NOTE: If rail is not assembled exactly as shown,
trolley will not travel smoothly along length of rail
or It will hit against nuts.

4. Position the cable pulley bracket on the front end

of the rail as shown. Fasten securely with the

hardware shown.

NOTE: When tightening the bolts, be sure to keep
bracket parallel to the rail. Otherwise, the rail may
bow when the opener is operated.

ASSEMBLY STEP 1

RAIL BACK

(TO OPENER)

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