Craftsman 139.53990DS Manual Del Propietário página 9

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 bolt and lock nut from the top of the
motor unit.
• Attach spreader to the motor unit with two screws.
• Place the "U" bracket, flat side down onto the bolt Bolt,
mounted on the motor unit and align the bracket
hole with the bolt holes. Fasten with the previously
U
removed bolt and lock nut.
• Align the rail assembly with the top of the motor Washer
unit. Slide the rail end onto the "U" bracket, all the _.
Spacer
way to the stops that protrude on the top and sides \_._
of the bracket.
U
Cover
Protection
Bolt Hole
HARDWARE SHOWN ACTUAL SIZE
Washer 5/8"
0
Lock Nut 1/4"-20
Bolt 1/4"-20x2-1/2" (1)
Spacer
ASSEMBLY STEP 3
Install the Idler PuUey
• 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.
To avoid SERIOUSdamage to garage door opener,
use ONLYthose bolts/fasteners mounted in the top of
the opener.
Hex Screws
8-32x7/16"
Lock Nut W
-1
I
I
Chain
Spreader
' Motor Unit
)rocket
I
I
Spacer_ _ Washer
SLIDE RAIL TO STOPS
ON TOP AND SIDES
OF BRACKET
Chain and
Cable
Bolt
Washer
Idler _E_ Trolley
Bolt ----FI Screwdriver \
Bolt
Trolley
Stop Hole
._ Grease \
- _ ._lnside Pulley
\
Lock _ Idler
Washer _ Pulley
3/8" I
_--_ Nut 3/8" _
Cable Link _
I
_._ Lock
Idler _ Nut
Pulley
Idler Bolt
HARDWARE SHOWN ACTUAL SIZE
Bolt 1/4"-20x1-3/4" LockNut 1/4"-20 Nut 3/8" Lock Washer 3/8"