Chamberlain 1356M Owner's Manual 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 door) about 2" (5 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.
• Proceed to Adjustment Step 1, page 27. Trolley will
re-engage automatically when opener is operated.
Nut 5/16"-18 Ring Fastener
Clevis Pin 5/16"x1-1/4"
(Door Bracket)
Clevis Pin 5/16"x1"
(Trolley)
HARDWARE SHOWN
ACTUAL SIZE
Lock Washer 5/16"
Hex Bolt
5/16"-18x7/8"
Figure 1
Outer Trolley
Ring
Fastener
Door Bracket
Clevis Pin
5/16"x1-1/4"
Figure 2
Lock
Washers
5/16"
Nuts
5/16"-18
Door Bracket
Figure 3
Lock
Washers
5/16"
Nuts
5/16"-18
Figure 4
CORRECT
Straight
Door Arm
Curved
Door
(Groove
Arm
facing out)
25
Inner Trolley
Clevis Pin
5/16"x1"
Straight
Door Arm
Curved
Door Arm
Emergency
Release
Handle
Bolts
5/16"-18x7/8"
Bolts
5/16"-18x7/8"
Cut This End
INCORRECT
Straight
Door Arm
Curved
Door
Arm