Fasten The Rail To The Opener; Install The Idler Pulley - Craftsman 139.18076 Owner's Manual

Assembly Step 2

Fasten the Rail to the Opener

• Insert a 1/4"-20x1-3/4 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.
• Remove the two screws from the top of the
opener.
• Place the U bracket, flat side down, on the opener
and align the bracket holes with the screw holes.
Fasten with the previously removed screws.
• Attach spreaders to the U bracket by snapping
them into place.
• Align the rail assembly with the top of the opener.
Slide the rail end onto the U-bracket, all the way
to the stops that protrude on the top and sides of
the bracket.
Hardware Shown Actual Size
Bolt 1/4"-20 x 1-3/4
Assembly Step 3

Install the Idler Pulley

• Lay the chain/cable beside the rail, as shown.
Grasp the end with the cable loop and pass
approximately 12" of cable through the window.
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"-20x1-3/4 bolt into the trolley stop
hole in the front of the rail as shown. Tighten
securely with a 1/4"-20 lock nut.
Idler Bolt
To fasten rail, use only those screws mounted
in the top of the opener. Any other screws will
cause serious damage to the opener.
Bolt
Lock Nut
1/4"-20
Idler
Bolt
3/8" Lock
Washer
Hardware Shown Actual Size
Bolt 1/4"-20 x 1-3/4
9
CAUTION CAUTION
Screws
"U" Bracket
Cover
Protection
Bolt Hole
SLIDE RAIL TO STOPS
ON TOP AND SIDES
OF BRACKET
Lock Nut
Chain and
Pulley
Cable
Washer
Locking Pliers
Trolley
Trolley
Stop Hole
Grease
Inside Pulley
Idler
Pulley
Cable Loop
3/8" Nut
Lock Nut 1/4"-20
Nut 3/8"
Opener
Sprocket
Hook Spreader
into Back Slots,
then Snap Tab
Into Front Slot
Bolt
Rail
Nut
Bolt
Trolley
Stop Hole
Idler Pulley
Lock Washer 3/8"