Craftsman 139.53918d Owner's Manual page 10

ASSEMBLY STEP 4
Install the Belt and Attach the Belt
Cap Retainer
1. Pull the belt around the idler pulley and toward the
trolley. The ribbed side must contact the pulley,
2. Hook the trolley connector into the retaining slot on
the trolley as shown.
3. With the trolley against the screwdriver, dispense the
remainder of the belt along the rail length toward the
motor unit and around the sprocket. The sprocket
teeth must engage the belt.
4. Check to make sure the belt is not twisted, then
connect it to the flat end of the trolley threaded shaft
with the master link, as illustrated:
• Push pins of master link bar through holes in end of
belt and trolley threaded shaft.
• Push master link cap over pins and past
pin notches.
• Slide clip-on spring over cap and onto pin notches
until both pins are securely locked
in place.
5. Insert the trolley threaded shaft through the hole in
the trolley. Be sure the belt is not twisted, and the
ribbed side faces the rail.
To avoid possible SERIOUSINJURYto fingers from moving
garage door opener:
• ALWAYSkeep hand clear of belt pulley while operating
opener•
• Securely attach belt pulley cover BEFORE operating.
HARDWARE SHOWN ACTUAL S_ZE
Hex Screw 8x3/8"
Spring/Trolley Nut
6. Hold the belt at the trolley shaft as you thread the
spring nut by hand onto the shaft until finger tight / f
• the Do tools. _/
against trolley, not use any __
7. Remove the screwdriver. M,aster Link. _ _z_
bllp-un bprlng _'_._ / /_/.,_pv_*.-
8. Position the belt cap retainer over the motor unit _....<'<_-._/jy._
• Master Link Cap ->_._
sprocket as shown and fasten to the mounting plate J_J_
with 8x3/8" hex screws provided. __'_'"-'._'<,_,
" Pin
___,_/" Trolley Master
___) Threaded Link Bar
Sh t
_ __r_'_fO ,y Round
__'_" I Retaining
Oonnee,or
Idler Pulley
I ' I
Belt Cap_
Retainer
Hex Screws
#8x3/8"
Motor Unit
Belt Pulley
Plate
10