Fasten The Rail To The Motor Unit; Install The Idler Pulley - Craftsman 139.18489DS Manuel D'instructions

ASSEMBLY STEP 2

Fasten the Rail to the Motor Unit

1. Insert a 1/4"-20x2-1/2" bolt, washer and spacer into the cover
protection bolt hole on the back end of the rail as shown.
Install lower spacer and washer then tighten securely with a
1/4"-20 lock nut. DO NOT over tighten.
2. Remove the bolt and lock nut from the top of the motor unit.
3. Use the carton to support the front end of the rail.
4. Place the "U" bracket, fl at side down onto the motor unit and
align the bracket holes with the bolt holes. Fasten the "U"
bracket with the previously removed bolt and lock nut; DO NOT
use any power tools. The use of power tools may permanently
damage the garage door opener.
HARDWARE SHOWN ACTUAL SIZE
Washer 5/8"
Bolt 1/4"-20x2-1/2"
ASSEMBLY STEP 3

Install the Idler Pulley

1. Lay the belt beside the rail, as shown. Grasp the end with the
hooked trolley connector and pass approximately 12" (30 cm)
of belt through the window. Keep the ribbed side toward the
rail, and 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 between the idler bolt and
the trolley in the front rail section. Use a fl at head screwdriver
and lift the rail tab until the tab is vertical (90°).
Lock Nut 1/4"-20
Spacer
HARDWARE SHOWN ACTUAL SIZE
Idler Bolt
To avoid SERIOUS damage to garage door opener, use ONLY
those bolts/fasteners mounted in the top of the opener.
Bolt
Washer
Lock Nut
Spacer
Cover
Protection
Bolt Hole
Spacer
Washer
Lock Nut
Rail Tab
Idler Bolt
Screwdriver
Rail
Tab
Lock
Washer
3/8"
Nut 3/8"
Trolley
Connector
Nut 3/8"
9
Bolt
Motor Unit Sprocket
"U" Bracket
CORRECT
INCORRECT
Grease Inside Pulley
Idler Pulley
Lock Washer 3/8"