COATS 4070 Tire Changer - Manual (Page 13)

Important: Always read and follow operating instructions. • 9
Bead Sealing
1. Connect the inflation hose to the tire valve stem.
2. Lift tire so that the upper bead is against the edge
of the rim to create a seal. Be sure the upper bead is
over the bottom of the valve stem (figure 14).
Figure 14 - Bead Sealing
3. Depress the Air-Flate pedal to position 2 and hold
for 1 second to begin air flow through the inflation hose,
then depress the Air-Flate pedal fully to position 3, hold
very briefly (less than 1 full second), and remove foot
from the pedal. The blast of air through the inflation
hose and the top cover jets will expand the tire and seal
the beads (figure 14).
4. Check to make sure that the beads are sealed to
the wheel. Repeat step 3 if they are not fully sealed.
NOTE: Allow time for the surge tank pressure to
recover before depressing the pedal to position 3 again.
TIP: If the tire and wheel are properly lubricated and
the operator cannot achieve bead seal after 3 attempts,
it may help to remove the valve core. Remove the air
chuck from the valve stem and unscrew the valve core
from the stem. Reattach the air chuck and perform the
bead seal operation again.
5. Check tire pressure (Air-Flate pedal must be in
position 1). If pressure is indicated in tire, bead seal has
been obtained. Proceed to Bead Seating.
Bead Seating
WARNING
Operator should keep hands, arms, and
entire body away from the tire and wheel
during the remaining Bead Seat and Infla-
tion procedures. Do not stand over tire, as
personal injury could result.
WARNING
NEVER increase air pressure to exceed 40
PSI when attempting Bead Seat. If unable
to obtain Bead Seat, something is wrong.
Deflate tire completely, inspect both the tire
and wheel, and correct any problems found.
Relubricate both tire beads, and reattempt
Bead Seal and Bead Seat procedures. Follow
all safety instructions in this manual and on
machine.
WARNING
Do not force the tire onto the rim. Bead dam-
age could result making the tire unsafe and/
or creating the risk of injury.
Check tire pressure frequently. Never exceed 40 PSI
while seating beads. Once seated, never exceed tire
manufacturer’s recommended air pressure. Tires can
explode, especially if they are inflated beyond their
limits. At all pressure levels when inflating through the
valve stem, keep hands, arms, and entire body away
from inflating tire. An exploding tire, wheel, or bead
sealing equipment may propel upward and outward
with sufficient force to cause serious injury or death to
operator or bystander.
1. Verify that beads are sealed by checking the gauge
for air pressure in the tire. Do not proceed if beads are
not sealed.
2. If beads are sealed, loosen the centering cone one
full turn. DO NOT REMOVE IT!