Instructions / Assembly
CAUTION
1. Lay the chain / belt beside the rail as shown. 
2. Grasp the turnbuckle connector [K2] at the end of the 
 chain / belt assembly, pass it through the window.
3. Position the trolley assembly [J3] near the door end. Pull the   
 chain assembly (cable end) / belt around the idler pulley [J2] 
 and feed through the trolley. Place the turnbuckle connector 
 2ft from idler pulley. 
 Note: The cable on the chain assembly, or the ribbed side 
  on the belt assembly must contact the pulley.
4. Grasp the turnbuckle [K3] and dispense the remainder of 
 the chain assembly / belt along the rail tow
ard the motor unit around  
 the sprocket assembly and continuing to the turnbuckle 
 connector. The sprocket assembly [J4] teeth must engage 
 the chain / belt. 
5. Hook the turnbuckle into the turnbuckle connector. 
To avoid possible SERIOUS INJURY to finger from moving 
garage door opener:
• ALWAYS keep hand clear of sprocket, chain / belt or any 
moving parts while operating opener.
• Securely attach sprocket cover BEFORE operating.
Step 3 – Install the chain / belt
10
ASSEMBLE THE RAIL










