Chamberlain HD920EV Manuale Utente

19

   Close the door. Disconnect the 

trolley by pulling the emergency 
release handle. 

   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).

   Attach the straight door arm to the 

door bracket using the clevis pin 
(H13). Secure with the ring fastener 
(H19).

   Attach the curved door arm to the 

trolley using the clevis pin (H14). 
Secure with the ring fastener (H19).

   Pull the emergency release handle 

toward the garage door opener until 
the trolley release arm is horizontal. 

H20

H21

H15

H13

H19

H19

Hex Bolt
5/16"-18x7/8" 

Nut 
5/16"-18 

Lock Washer
5/16"-18 

Clevis Pin
5/16"x1" 

Clevis Pin
5/16"x1-1/4" 

Ring 
Fastener 

IMPORTANT: The groove on the straight 
door arm MUST face away from the curved 
door arm.

Straight 
Door 
Arm

Curved 
Door
Arm

(Groove 
facing out)

Straight 
Door 
Arm

Curved 
Door 
Arm

H14