Craftsman 139.53918D Manual Del Propietário página 9

ASSEMBLY STEP 2
Fastenthe Rai/ to the Motor Unit
1. Insert a 1/4"-20xl-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 NOTovertighten.
2. Removethe two bolts from the top of the motor unit.
3. Use the carton to support the front end of the rail.
4. Placethe "U" bracket, flat side down onto the motor unit and
align the bracket holes with the bolt holes. Fastenthe "U"
bracket with the previously removed bolts; DONOT use any
power tools. The use of power tools may permanently damage
the garage door opener.
To avoid SERIOUSdamageto garage door opener, use ONLY
those bolts/fasteners mounted in the top of the opener.
Bolts
Cover
Protection
Bolt Hole
"U" Bracket
Bolt \
HARDWARESHOWN ACTUALSIZE
d 0
Bolt 1/4"-20xl-3/4"
Lock Nut
1/4"-20
Lock Nut _
ASSEMBLY STEP 3
Insta// the Id/er Pu//ey
1. Laythe belt beside the rail, as shown. Graspthe end with the
hooked trolley connector and pass approximately 12" (30 cm)
of belt through the window. Keepthe ribbed side toward the
rail, and allow it to hang until Assembly Step 4.
2. Removethe tape from the idler pulley. The inside center should
be pre-greased. If dry, regreaseto ensure proper operation.
3. Placethe idler pulley into the window as shown.
4. Insert the idler bolt from the top through the rail and pulley.
Tighten with a 3/8" lock washer and nut underneaththe rail
until the lock washer is compressed.
5. Rotatethe pulley to be sure it spins freely.
6. Locate the rail tab. The rail tab is between the idler bolt and the
trolley in the front rail section. Use a flat head screwdriver and
lift the rail tab until the tab is vertical (90°).
Screwdriver
. _ _Grease Inside
I
Lock _
Washer _ Idler Pulley
3/8" _l_Nut 3/8"
Trolley
Connector
HARDWARESHOWN ACTUALSIZE
Idler Bolt Nut 3/8"
Lock Washer 3/8"
CORRECT
Q
INCORRECT
Pulley