Installation step 12, Hole alignment alternative – Craftsman 1/2 HP GARAGE DOOR OPENER 139.53978SRT User Manual
Page 26
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Installation Step 12
Connect Door Arm to Trolley
Follow instructions which apply to your door
type as illustrated below and on page 27.
....... ....................................................................
Make sure garage door is fully closed. Puil the emergency release handle to disconnect the outer trolley
from the inner trolley. Slide the outer trolley back (away from the pulley) for 8" minimum as shown below.
Figure 1:
• Fasten straight door arm section to outer trolley
with the the 5/16"x1" clevis pin. Secure the
connection with a ring fastener.
• Fasten curved door arm to the door bracket in the
same way, using the
5/16“x1-1/4" clevis pin.
Figure 2:
• Bring arm sections together. Find two pairs of holes
that line up and join sections. Select holes as far
apart as possible to increase door arm rigidity.
Figure 3:
• If holes in curved arm are
above
holes in straight
arm, disconnect straight arm. Cut about 6" from
the solid end. Reconnect to trolley with
cut end
down
as shown.
• Bring arm sections together.
• Find two pairs of holes that line up and join with
screws, lock washers and nuts.
Hole Alignment Alternative
Proceed to Adjustment Step 1, page 28. Trolley will re-engage automatically when the opener Is operated.
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