Install The Idler Pulley - Craftsman 139.53985DM Manual Del Propietário

ASSEMBLY STEP 2
Fasten the Rail to the Motor Unit
• 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.
• 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.
0
Lock Nut 1/4"-20
HARDWARE SHOWN ACTUAL SIZE
Washer 5/8" Spacer
Bolt 1/4"-20x2-1/2
To avoid SERIOUSdamage to garage door opener, use ONLY
those b01ts/fasteners mounted in the top of the opener.
Bolt
1/4"-20x2-1/2
u
Washer 5/8"
Spacer
Cover X,@
Protection
Bolt Hole
Hex Screws
832x7/16" -_Ti _
_ Chain
_ Spreader
Bolts
I
_= Motor Unit
Sprocket
Spacer J "_'_" SLIDE RAIL TO STOPS
t ON TOP AND SIDES
OF BRACKET
_ Washer 5/8"
Lock Nut
1/4"-20
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"-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.
Chain and
Cable
Bolt
Washer
Idler_ Trolley
Bolt _
Screwdriver
I
I
I
I
I
Bolt
Trolley
Stop Hole
_/_-- Grease
-- _lnside Pulley _\
Lock i "_ Idler \\
Washer _ Pulley
3/8" I
I Nut 3/8" _ __j
Cable Link
t
_Lock
Idler , Nut
Pulley i
Idler Bolt
HARDWARE SHOWN ACTUAL SIZE
Bolt 1/4"-20x1-3/4" Lock Nut 1/4"-20 Nut 3/8" Lock Washer 3/8"