Craftsman 139.53975SRT - Manual (Page 26)

Installation Step 12
Connect Door Arm to Trolley
Follow instructions which appiy to your door
type as iiiustrated beiow and on page 27.
Make sure garage door is fuiiy ciosed. Pull 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"xl" 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.
Hole Alignment Alternative
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.
Proceed to Adjustment Step 1, page 28. Trolley will re-engage automatically when the opener is operated.
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