Fasten The Rail To The Motor Unit And; Install The Idler Pulley - Craftsman 139.53910D Manual Del Propietário

ASSEMBLY STEP 2
Fasten the Rail to the Motor Unit
• 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. Do NOT
overtighten.
• Remove the two bolts from the top of the motor
unit.
• Place the "U" bracket, flat side down onto the
motor unit and align the bracket hole 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.
• Attach spreader to the motor unit with two screws.
HARDWARE SHOWN ACTUAL SIZE
Bolt 1/4"-20x1-3/4"
ASSEMBLY STEP 3

Install the Idler Pulley

• 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 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 avoid SERIOUS damage to garage door opener,
use ONLY those bolts/fasteners mounted in the top of
the opener.
Bolt
Lock Nut
1/4"-20
Chain and
Cable
Idler
Bolt
Lock
Washer
3/8"
HARDWARE SHOWN ACTUAL SIZE
Bolt 1/4"-20x1-3/4"
9
WARNING
CAUTION
Hex Screws
8-32x7/16"
Bolts
"U" Bracket
Cover
Protection
Bolt Hole
SLIDE RAIL TO STOPS
ON TOP AND SIDES
OF BRACKET
Lock Nut
Bolt
Pulley
Washer
Trolley
Screwdriver
Grease
Inside Pulley
Idler
Pulley
Nut 3/8"
Cable Link
Lock Nut 1/4"-20 Nut 3/8"
Chain
Spreader
Motor Unit
Sprocket
Rail
Nut
Bolt
Trolley
Stop Hole
Lock
Idler
Nut
Pulley
Lock Washer 3/8"