Connect Door Arm To Trolley - Chamberlain 1120E-1/2HP Owner's Manual

INSTALLATION STEP 11

Connect Door Arm to Trolley

Follow only those instructions which apply to
your door type.
Make sure garage door is fully closed. Pull the manual release handle to disconnect the outer trolley from the
inner trolley. Slide the outer trolley back (away from the door) about 5cm as shown in figures A, B and C.
Figure A: Fasten straight door arm section to outer
trolley with a clevis pin. Secure the connection with
a ring fastener.
Fasten curved section to the door bracket in the
same way.
A
Outer Trolley
Ring
Fastener
Door
Bracket
Clevis Pin
Figure C: If holes in curved arm are ABOVE holes
in straight arm, disconnect straight arm. Cut about
15cm 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.
Hardware Shown Actual Size
Nut 5/16"-18 Lockwasher 5/16"
Hex Screw
5/16"-18x7/8"
Proceed to Step 1, page 23. Trolley will re-engage automatically when opener is operated.
SECTIONAL DOORS ONLY
Inner Trolley
Clevis
Pin
Straight
Door Arm
Curved
Door Arm
Ring Fastener
Clevis Pin
5/16"x1"
21
Figure B: 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.
B
Lock
Washers
5/16"
Nuts
5/16"-18
Door Bracket
C
Lock
Washers
5/16"
Nuts
5/16"-18
Cut This End
Rope
Manual
Release
Handle
Screws
5/16"-18x7/8"
13mm Socket Wrench
Screws
5/16"-18x7/8"