Craftsman 139.18405D Owner's Manual page 26

ALL ONE-PIECE DOORS
1. Assemble the Door Arm:
IMPORTANT: The groove on the straight door arm MUST face
away from the curved door arm (Figure 5).
• Fasten the straight and curved door arm sections together
to the longest possible length (with a 2 or 3 hole overlap)
(Figure 5).
• Make sure the garage door is fully closed. Connect the
straight door arm section to the door bracket with the
5/16"x1-1/4" clevis pin.
• Secure with a ring fastener.
• Pull the emergency release handle, disconnecting the outer
trolley from the inner trolley by pulling straight down on the
emergency release handle and sliding the outer trolley back
toward the motor unit.
• Connect the curved door arm section to the trolley using the
5/16"x1-1/4" clevis pin and ring fastener.
NOTE: Adjusting the limits on the following page:
• The trolley will automatically connect. If not, review the
trolley lockout feature on page 32.
• When setting the up limit on the following page, the door
should not have a "backward" slant when fully open
as illustrated below. A slight backward slant will cause
unnecessary bucking and/or jerking operation as the door is
being opened or closed from the fully open position
(Figure 6).
Figure 6
Inner Trolley
Door Arm
Closed
Door
Outer Trolley
Emergency Release Handle
Inner Trolley
Correct Angle
Open Door
Figure 5
CORRECT
Straight
Door Arm
Curved
(Groove
Door
facing out)
Arm
Door
Bracket
Clevis Pin Straight
5/16"x1-1/4" Arm
Bolts
5/16"-18x7/8"
Outer Trolley
Door with
Backward Slant
(Incorrect)
26
INCORRECT
Straight
Door Arm
Curved
Door Arm
Ring
Fastener
Nuts
Lock
5/16"-18
Washers
5/16"
Curved
Door Arm