Fasten The Rail To The Motor Unit And Install The Idler Pulley - Craftsman 139.53985DM Owner's Manual

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 overtighten.
2. Remove the two bolts from the top of the motor unit.
3. Use the carton to support the front end of the rail.
4. Place the "U" bracket, flat side down onto the motor
unit and align the bracket hole with the bolt holes.
Fasten the "U" bracket with the previously removed
bolts, hand tighten ONLY and DO NOT use any power
tools. The use of power tools may permanently
damage the garage door opener.
5. Attach spreader to the motor unit with two screws.
HARDWARE SHOWN ACTUAL SIZE
Washer 5/8"
Bolt 1/4"-20x2-1/2"
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 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).
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
1/4"-20x2-1/2
"U" Bracket
Washer 5/8"
Spacer
Cover
Protection
Bolt Hole
Spacer
Washer 5/8"
Lock Nut
1/4"-20
Chain and
Cable
Rail
Tab
Idler
Bolt
Lock
Washer
3/8"
Nut 3/8"
Nut 3/8"
9
Hex Screws
8-32x7/16"
Chain
Bolts
Spreader
Rail Tab
Trolley
Screwdriver
Grease
Inside Pulley
Idler
Pulley
Cable Link
Lock Washer 3/8"
CORRECT
INCORRECT