Fasten The Rail To The Motor Unit; Install The Idler Pulley - Craftsman 139.53930DM 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
O
Washer 5/8" Lock Nut 1/4"-20 Spacer
Bolt 1/4"-20x2-1/2"
To avoid SERIOUSdamage to garage door opener, use ONLY
those bolts/fasteners mounted in the top of the opener.
B01t
1/4"-20x2-1/2"
\
Washer 5/8" l
Spacer
Cover
Protection
Bolt Hole
B01t
I
I
"U" Bracket
Chain
Spreader
Washer 5/8" "_"
Lock Nut "/_
1/4"-20
ASSEMBLY STEP 3
Install the Idler PuUey
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 (90°).
Chain and
Cable
._ Grease
- - -.._lnside Pulley
Lock i _ Idler
Washer _ Pulley
3/8" i
_-- Nut 3/8"
Cable Link
CORRECT
Q
iNCORRECT
Q
HARDWARE SHOWN ACTUAL SiZE
_ Idler Bolt Nut3/8"
Lock Washer 3/8"