Assembly; Install The Idler Pulley - Craftsman 139.53990 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 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,
mounted on the motor unit and align the bracket
hole with the screw hole. Fasten with the
previously removed screw and lock nut.
• 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.
HARDWARE SHOWN ACTUAL SIZE
E Washer 518"
©
Spacer
Bolt 1/4"-20 x 2-1/2
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" (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.
Toavoid SERIOUSdamage to garage door opener,
use ONLYthose bolts/fasteners mounted in the top of
the opener.
Hex Screws _
8-32x7/16 _ i
I
Bolt
I
Washer._ _
Spacer i
Cover 0
Protection
Bolt Hole'
Bolt_
Lock Nut_
Spreader
Motor Unit
Spacer_Washer
i_Lock Nu
SLIDE RAIL TO STOPS
ON TOP AND SIDES
OF BRACKET
'_Chain and
I _ Washer / fj .
Lockin t Pliers JJ
t Bd/ler_ Trolley Tr°IIE Y_ _ 4_
Stop Hole Bolt
i_J_ _ Inside Pulley _Jr
3/8" Lock t Pulley _ _]
Washer _ _ Cable Loop Idler Pulley
I_ 3/8" Nut
Idler Bolt
HARDWARE SHOWN ACTUAL SIZE
/)))))))))) @
Bolt t/4"-20 x 1-3/4 (1) Lock Nut 1/4"-20 Nut 3/8" Lock Washer 3/8"
9