Chamberlain HD210C Manuel page 8

Assembly
STEP 3 Install the idler pulley
1. Lay the chain/cable beside the rail, as shown. Grasp the end of the cable 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. Insert the 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 is near the idler pulley on the front rail section. Use a flat head
screwdriver and lift the rail tab until the tab is vertical (90º).
Bolt
HARDWARE
Nut 3/8"
Lock Washer 3/8"
Lock Washer 3/8"
Nut 3/8"
7
CORRECT
Rail Tab
INCORRECT
Rail
Bolt
Tab
Grease Inside Pulley
Idler Pulley
Rail