Install The Idler Pulley - Craftsman 139.53915D Manual Del Propietário

ASSEMBLY STEP 2
Fasten the Rail to the Motor Unit
• Insert a 1/4"-20xl-3/4 bolt into the cover protection bolt
hole on the back end of the rail as shown. Tighten
securely with a 1/4"-20 lock nut Do NOTovertighten.
• Remove the two bolts from the top of the motor unit
• Place the "U" bracket, flat side down, on the motor unit
and align the bracket holes with the bolt holes. Fasten
with the previously removed bolts.
• Align the rail assembly with the top of the motor unit.
Slide the rail end onto the "U" bracket, all the way to the
stops that protrude on the top and sides of the bracket.
To avoid SERIOUSdamageto garage door opener, use ONLY
those bolts/fasteners mounted in the top of the opener
"U" Bracket
Bott
I
Cover
Protection
Bott Hote
Bolts
Motor Unit
Sprocket
HARDWARE SHOWN ACTUAL SIZE
Lock Nut
Bolt 1/4" 20xl 3/4 _ 1/4" 20
I
Lock Nut
SLIDE RAIL TO STOPS
ON TOP AND SIDES
OF BRACKET
ASSEMBLY STEP 3
Install the Idler Pulley
• 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 5.
• Remove the tape from the idler pulley. The inside center
should be pre-greased. If dry, regrease to ensure proper
operation.
• Place the idler pulley into the window as shown.
• 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.
• Rotate the pulley to be sure it spins freely.
• Insert a 1/4"-20xl-3/4 bolt into the trolley stop hole in
the front of the rail as shown. Tighten securely with a
1/4"-20 lock nut.
Lock Washer
3/8"
O
Trolley
Connector
Bolt
HARDWARE SHOWN ACTUAL SIZE
Bolt 1/4" 20xl 3/4" Lock Nut 1/4" 20
Nut 3/8" Lock Washer 3/8"