Craftsman 139.53663SRT Owner's Manual page 9

1/2 hp
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Assembly
Step 1 (Continued)
Assemble
the Rail
4. Begim_ing with the sprocket end, straighten the two
rail sections so that the screw rod is in a straight line at
the joint. (Avoid handling the joints, which may have
sharp edges.)
5. Carefully slide the pins at the top edge of the rail into
the openings on the adjacent rail. It is essential that
the rail assembly be on a level surface to achieve
proper alignment
and to avoM damage to the pins.
6. Insert two 1/4"-20xl-3/4"
bolts tl_ough the center
holes of a brace, and place its open length against the
rail at this joint, aligning the holes as shown. Position
another brace on the opposite side of the rail over the
bolts, add 1/4"-20 lock nuts, and hand tighten. Insert
two additional bolts and hand tighten.
7. Keeping the rail straight and on a level surface, grasp
the screw rods on each side of the remaining joint and
pivot into a straight line. Repeat steps 5 and 6.
8. With a 7/16 wrench, tighten bolts til snug, working
from the center holes of the braces to those further
from the joints. Do not overtighten.
Sprocket
End
Rail
Support
Brace
AIignment
Slide End
Lock
Hote
Rails Towards
Nuts
Center Rail
Door End
D
Lock
Nuts
Center Rail
1/4x20x1-3/4"
Bolts
Slide End
Rails Towards
Center Rail
Hardware Shown Actual Size
Bolt
1/4"-20
1/4-20xl-3/4"
(8)
Lock Nut

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