Craftsman 139.18451DM Manuel D'instructions page 25

INSTALLATION STEP 12
Connect Door Arm to Trolley
Follow instructions which apply to your door type as illustrated
below and on the following page.
SECTIONAL DOORS ONLY
• Make sure garage door is fully closed. Pull the emergency
release handle to disconnect the outer trolley from the inner
trolley. Slide the outer trolley back (away from the pulley) about
8" (20 cm) as shown in Figures 1, 2 and 3.
• Figure 1:
– Fasten straight door arm section to outer trolley with the
5/16"x1" clevis pin. Secure the connection with a ring
fastener.
– Fasten curved section to the door bracket in the same way,
using the 5/16"x1-1/4" clevis pin.
IMPORTANT: The groove on the straight door arm MUST face
away from the curved door arm (Figure 4).
• 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, Hole alignment alternative:
– If holes in curved arm are above holes in straight arm,
disconnect straight arm. Cut about 6" (15 cm) 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 bolts, lock
washers and nuts.
• Pull the emergency release handle toward the opener at a 45°
angle so that the trolley release arm is horizontal.
Proceed to Adjustment Step 1, page 27. Trolley will re-engage
automatically when opener is operated.
HARDWARE SHOWN ACTUAL SIZE
Nut 5/16"-18 Lock Washer 5/16"
Clevis Pin
5/16"x1" (Trolley)
Ring Fastener
Clevis Pin Hex Bolt
5/16"x1-1/4" (Door Bracket) 5/16"-18x7/8"
Pulley
Ring
Fastener
Door
Bracket
Figure 1
Clevis Pin
5/16"x1-1/4"
Pulley
Lock
Washers
5/16"
Nuts
5/16"-18
Figure 2
Door
Bracket
Pulley
Lock
Washers
Nuts
5/16"
5/16"-18
Figure 3
CORRECT
Straight
Door Arm
(Groove
facing out)
Figure 4
25
Outer
Inner
Trolley
Trolley
Clevis Pin
5/16"x1"
Emergency
Release
Handle
Straight
Door Arm
Curved
Door Arm
Bolts
5/16"-18x7/8"
Bolts
5/16"-18x7/8"
Cut this end
INCORRECT
Straight
Door Arm
Curved
Door Arm
Curved
Door
Arm