Chamberlain HD420EVP - Assembly: Idler Pulley; Install Idler Pulley

7
Assembly
STEP 3 Install the idler pulley
1. Lay the chain/cable beside the rail, as shown. Grasp the end ofthe cable and pass
approximately 12" (30 cm) ofcable 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. Insertthe idler bolt from the top through the rail and pulley.Tighten with a 3/8" lock washer and
nut underneath the rail until the lock washer is compressed.
5. Rotate the pulley to be sure it spins freely.
6. Locate the rail tab. The rail tab isnear the idler pulley on the front rail section. Use a flathead
screwdriver and liftthe rail tab until the tab is vertical (90º).
HARDWARE
Bolt
Nut 3/8"
Lock Washer 3/8"
Rail
Idler Pulley
Grease Inside Pulley
Bolt
Lock Washer 3/8"
Nut
3/8"
Rail
Tab
CORRECT
INCORRECT
Rail Tab