Craftsman 139.53664SRT2 - Manual (Page 10)

Assembly Step 4
Install the Belt & Set the Belt Tension
1. Drop the notched side of the trolley clip into the
retaining slot on top of the trolley. (Figure 1)
2. Grasp the clip connector at the end
of the belt and slip it through the belt
pulley bracket from behind, around
the pulley and toward the trolley.
Fasten the belt clip connector to the
trolley clip with a master link:
• Push pins of master link bar
through holes in troliey clip and belt
clip connector.
• Push master link cap over pins and
onto pin notches.
• Slide clip-on spring over cap and
onto pin notches until both pins are
securely locked in place.
4. With the trolley against the
screwdriver, dispense the belt along
the rail and around the opener
sprocket. The sprocket teeth must
engage the belt. {Figure 2)
5. Use the second master link to connect the belt to
the flat end of the trolley threaded shaft. (Figure 1)
Check to make sure the belt is not twisted.
6. Remove the screwdriver.
Serious injury can result if fingers become
entangied in moving opener sprocket. Attach
beit cap retainer secureiy. Never operate
opener while your hand is near the opener
sprocket.
Figure 1
Slip Belt Clip
Connector
through
Pulley Bracket
from this direction
and attach
to trolley clip
Figure 4
Figure 2 Opener Sprocket
Nul Ring
Slots
7. Insert the trolley threaded shaft through the hole
in the trolley.
8. Hold the belt at the trolley shaft to avoid twisting
as you thread the spring/trolley nut by hand on
the shaft until finger tight against the trolley.
(Figure 3) Do not use any tools.
Figure 3
Trolley
Insert a screwdriver tip into one of the nut ring
slots and brace it firmly against the trolley.
(Figure 4)
Place a 7/16" open end wrench on the square
end. Roate about 1/4 turn until the spring
releases and snaps the nut ring against the
trolley. (Figure 5)
This extends the spring for optimum belt tension.
10
Figure 5
Trolley
Spring
Trolley Nut
Hi
AFTER RELEASE
---------- 1-1/4" ---------
1 0