Installation manual
 Owner Installation Instructions GDO-11v1 Ero
®
17
Mounting Door Bracket & Arms
24
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26
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27
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Step 12 - Mounting Door Bracket
The door bracket comes in two parts. The bottom plate 
with two mounting holes is used on its own for one piece 
doors. For sectional doors, the top plate is placed over 
the bottom plate and is fi xed with four (4) screws (Fig. 
24).
Mount the door bracket, or bracket assembly, 
on the door’s centre line one-third down the top 
panel (Fig. 24) using M6 or equivalent screws (not 
supplied), 
STEEL DOORS ONLY: Bracket can be welded in 
place.
NOTE: If in doubt about the door’s strength, 
reinforcement may be added to the door’s frame 
where necessary. Door damage may occur if the 
bracket is installed on a panel with insuffi cient 
strength. The opener’s warranty does not cover 
damage caused to the door and/or door panels.
Step 13 - Attaching the Arms
For Sectional And One Piece Doors With 
Track:
Assemble the bent arm (connecting to the door) 
to the right side of the straight arm (connecting 
to the shuttle) with bolts and nuts supplied in the 
accessory pack (Fig. 25). Always use both bent and 
straight arms.
Connect the assembled arm to the bracket and the 
disengaged trolley with clevis and snap pins. The 
angle “A” must be more than 10° (Fig. 26).
WARNING: Connecting the bent arm the other 
way around may damage the door. The straight 
arm should not protrude beyond the heel of the 
bent arm.
For One Piece Doors Without Track
Assemble the bent and straight arms as shown in 
Fig. 27 with bolts and nuts supplied in the accessory 
pack. Always use both the bent and straight arms.
Connect the assembled arm to the bracket and the 
disengaged trolley with clevis and snap pins.
If installing on a door with a bad wave action, 
lengthening the arm will assist in reducing this 
effect.
IMPORTANT NOTE: Adjust the length of the 
cord so that its toggle is no more than 1.8m from 
the ground.
a.
b.
a.
b.
a.
b.
c.
10
0
A
25
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Bent arm connected 
to the door
Straight arm 
connected to the 
shuttle
Centre of the door










