Install The Belt And Attach The Belt Cap Retainer - Craftsman 139.53914 Owner's Manual

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 pliers, 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:
To avoid possible SERIOUSINJURYto fingers from
moving garage door opener:
• ALWAYSkeep hand clear of sprocket while operating
opener.
• Securely attach sprocket cover BEFORE operating.
• 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.
HARDWARE SHOWN ACTUAL SIZE
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
against the trolley. Do not use any tools.
7. Remove the locking pliers.
8. Position the belt cap retainer over the motor unit /_
sprocket as shown and fasten to the mounting /_/.,,_/
plate with 8x3/8 hex screws provided.
" _lla_t_rnL&pkr i n g
_/__/
Master Link Cap "- "
Threaded Link Bar
C:) Shaft
@ Round
Retaining
Trolley Slot
MOtOr Unit
: J Sprocket
f -Mounting
Plate
lO