Chamberlain HD220 Owner's Manual page 8

Chain drive garage door opener
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Assembly
STEP 3 Install the pulley
1. Lay the chain/cable beside the rail, as shown. Grasp the end with the cable loop and pass
approximately 12" (30 cm) of cable through the window. Allow it to hang until Assembly Step 4.
2. Remove the tape from the idler pulley. The inside center should be pre-greased. If dry, regrease
to ensure proper operation.
3. Place the idler pulley into the window as shown.
4. Secure idler pulley with clevis pin and ring fastener.
5. Rotate the pulley to be sure it spins freely.
6. Locate the rail tab. The rail tab is between the idler bolt and the trolley in the front rail section. Use
a flat head screwdriver and lift the rail tab until the tab is vertical (90º).
Clevis Pin 5/16"x1-1/2"
HARDWARE
Ring Fastener
Chain/Cable
Cevis Pin
5/16"x
1-1/2"
Ring Fastener
7
CORRECT
Rail Tab
INCORRECT
Screwdriver
Rail Tab
Grease Inside Pulley
Idler Pulley
Rail

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