Install The Belt And Attach The Belt Cap Retainer - Craftsman 139.53914D 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 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.
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 screwdriver.
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.
idler Pulley
To avoid possible SERIOUSINJURYto fingers from
moving garage door opener:
• ALWAYSkeep hand clear of sprocket while operating
opener.
• Securely attach sprocket cover BEFORE operating.
HARDWARE SHOWN ACTUAL SIZE
Hex Screw 8x3/8"
Spring/Trolley Nut
Master Link
Clip-On Spring
Master Link Cap
Retaining
Trolley Slot
Connector
Pin
Notc_
Trolley Master
Threaded Link Bar
Shaft
Round
Hole
_- Hex Screws
Be_t Cap ___ #8x3/8
Retainer
Motor Unit
i / Sprocket
///
Plate
10