Connect The Door Arm To The Trolley - Chamberlain HD920EV Manual

Installation

9 Connect the door arm to the trolley

Installation will vary according to the garage door type. Follow the instructions which apply to your door.
IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm (Figure 1).
OPTION A
ONE-PIECE DOORS
9.1A
Close the door. Disconnect the trolley
by pulling the emergency release
handle.
9.2A
Fasten the straight door arm and the
curved door arm together to the
longest possible length (with a 2 or 3
hole overlap) using the bolts (H15),
nuts (H20) and lock washers (H21).
9.3A
Attach the straight door arm to the door
bracket using the clevis pin (H13).
Secure with the ring fastener (H19).
9.4A
Attach the curved door arm to the
trolley using the clevis pin (H14).
Secure with the ring fastener (H19).
9.5A
Pull the emergency release handle
toward the garage door opener until
the trolley release arm is horizontal.
FIGURE 1
CORRECT INCORRECT
Straight
Straight Door
Door Arm Arm
Curved
(Groove
Door
facing out)
Arm
One-Piece Door without Track
H19
H19
H20
H21
H13
H15
One-Piece Door with Track
H20
H19 H19
H21
H13
H15
Curved
Door
Arm
H14
H19
H14
Ring Fastener
19
HARDWARE
H13
Clevis Pin 5/16"x1-1/4"
H14
Clevis Pin 5/16"x1"
H15
Hex Bolt 5/16"-18x7/8"
H20 H21
Lock
Nut
Washer
5/16"-18
5/16" -18