Craftsman 139.53992 Owner's Manual page 10

1/2 hp
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ASSEMBLY
STEP
2
Fasten
the Rail To the Motor
Unit
and Install
the Trolley
NOTE: To aid in assembly and installation, replace
the foam packing around the motor unit. Remove it
after Installation Step 5.
• Working on a level surface, align the rail assembly
with the motor unit, as shown.
• Slip the coupling over the rail sprocket.
• Slide the rail through the motor unit bracket until
the coupling fits securely over the motor unit
sprocket.
• Align the two bolt holes in the rail with those in the
motor unit bracket. Insert two 1/4"-20x5/8" hex
bolts and lock nuts. Tighten securely with a 7/16"
socket wrench.
• 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 motor unit.
Lock Nuts
1/4"-20
HARDWARE
SHOWN ACTUAL
SIZE
Lock Nut
Hex Bolt
1/4" - 20
1/4" - 20 x 5/8"
©
Motor Unit
Sprocket
Motor Unit
Bracket
Rail
Assembly
Coupling
Rail
Sprocket
Foam Packaging
Hex Bolts
1/4"-20x5/8"
Trolley
Release arm
Arrow must point
toward garage door
10

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