Chamberlain 248730 User Manual download pdf (Page 8)

Assembly

STEP 3 Install the idler pulley

1. Lay the chain/cable beside the rail, as shown. Grasp the end with the cable loop and pass

approximately12" (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. Ifdry,

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" lockwasher and

nut underneath the rail until the lockwasher is compressed.

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).

HARDWARE

Bolt

Nut 3/8"

Lock Washer 3/8"

Screwdriver

Rail

Idler Pulley

Grease Inside Pulley

Bolt

Lock Washer 3/8"

Nut

3/8"

Rail

Tab

CORRECT

INCORRECT

Rail Tab

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Chamberlain 248730 User Manual Page 8