Fastenthe Rail To The Motor Unit; Install The Idler Pulley - Craftsman 139.53918D Manual Del Propietário

ASSEMBLY STEP 2
Fastenthe 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.
• Removethe two bolts from the top of the motor unit.
• Placethe "U" bracket, flat side down, on the motor unit and
align the bracket holes with the bolt holes. Fastenwith 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.
HARDWARESHOWN ACTUALSIZE
Lock Nu @
Bolt 1/4"-20xl-3/4" 1/4"-20
To avoid SERIOUSdamageto garage door opener, use ONLY
those bolts/fasteners mounted in the top of the opener.
"U" Bracket
Bolt
I
Cover
Protection
Bolt Hole X
Bolts _ Unit Belt Pulley
SLIDE RAIL TO STOPS
ON TOP AND SIDES
OF BRACKET
Lock Nut I
ASSEMBLY STEP 3
Install the Idler Pulley
• Laythe belt beside the rail, as shown. Graspthe end with the
hooked trolley connector and pass approximately 12" (30 cm)
of belt through the window. Keepthe ribbed side toward the
rail, and allow it to hang until Assembly Step 5.
• Removethe tape from the idler pulley. The inside center should
be pre-greased. If dry, regreaseto ensure proper operation.
• Placethe 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 underneaththe rail
until the lock washer is compressed.
• Rotatethe 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.
Grease
_ _. __ Inside
Pulley
- _ Idler Pulley
Lock Washer 3/8"-_
Nut 3/8"
Trolley
Connector
Bolt
I
Idler _ Lock
Pulley , Nut
Idler Bo _ _]
HARDWARESHOWN ACTUALSIZE
Bolt 1/4"-20xl-3/4" Lock Nut 1/4"-20 Nut 3/8" Lock Washer 3/8"