COATS 7665 AX/EX Tire Changer - Manual (Page 9)

INFLATION
Tire inflation is performed in three steps: bead seal,
bead seat, and inflation. These steps are explained
in detail on page 13. Read the explanation of each
step and understand them thoroughly before pro-
ceeding.
Check for proper inflation
gauge operation. Accurate
pressure readings are
important to safe tire inflation. Refer to the
Operating Maintenance section of this manual for
instructions.
If the rim has been
clamped from the outside
for tire mounting, release
the clamps, lift the tire, and move the clamps to
the center of the table top.
If the wheel/tire has a
diameter larger than 14
inches and is difficult to
bead seal, the clamps should be moved to the
center of the table top for the bead seal operation.
Tire failure under pres-
sure is hazardous. This
tire changer is not intend-
ed to be a safety device to contain exploding
tires, tubes, wheels, or supplemental bead seal-
ing equipment that may be attached to the
tire/wheel assembly. Inspect tire and wheel care-
fully for match, wear, or defects before mount-
ing. Always use approved tire bead lubricant
during mounting and inflation.
The inflation pedal, located at the
rear of the left side of the machine,
controls the flow of air through the
bead sealing jets and the inflation
hose to achieve bead seal.
The bead seating/inflation hand
control valves are located on the
back side of the Inflation Guard.
These valves control
air pressure flow
through the inflation
hose.
NOTE: The clip-on
chuck on the end
of the hose should
always be an open
style with all parts in proper working order. On
open style chuck is on that allows air flow when
not attached to a valve, and will flow air when
the foot valve or hand valves are actuated.
Use the bead seal pedal
for bead sealing only. Do
not use this control to
bead seat or inflate the tire. Inflating the tire with
this feature bypasses the pressure liminting fea-
tures and could lead to over inflation and possi-
ble tire explosion. Do not use this pedal without
a tire and wheel positioned on the table top. Dirt
and debris could be blown into the air with
enough force to injure the operator or
bystanders.
S. The unit is equipped with a pressure limiter to
assist the operator with proper tire inflation. When
the inflation valves are pushed open simultaneously
and held, the pressure limiter cycles the air flow on
and off, checking the tire pressure during the off
cycle. This cycling helps to prevent over inflation of
the tire. Tires can still be over inflated and explode
with the use of this pressure limiter if all of the
instructions in this manual are not followed com-
pletely. The pressure limiter will keep most car and
light truck tires from inflating beyond 60 PSI (smaller
tires may reach higher pressures). It is the opera-
tor's responsibility to follow all instructions and to
control inflation pressure as specified in these
instructions. Check the function of the pressure lim-
iter regularly and maintain it according to the instruc-
tions provided in this manual for safe and proper
operation. Do not tamper with or attempt to adjust
the pressure limiter. Tires requiring inflation beyond
60 PSI should be inflated in an inflation
chamber/safety cage, or securely mounted on the
vehicle if such a device is not available.
Bead Sealing
1. Position valve stem in front of operator and con-
nect the inflation hose. Hold tire up against
upper edge of the wheel. Be sure tire’s top bead
is over the bottom of the valve stem (Figure 18).
Figure 18 - Lift Tire Upwards for Bead Sealing
2. Depress the bead seal pedal and hold for about
2 seconds. The blast of air from the jets will
expand the tire and seal the beads to the rim.
3. Release the bead seal pedal. Verify that both
beads are completely sealed to the wheel. Repeat
these steps if beads have not sealed. It may be
necessary to wait a few seconds for the air stor-
age tank to recover before attempting again.
Bead Sealing
7660/7665AX/EX Rim Clamp Tire Changer • 7
CAUTION
CAUTION
CAUTION
DANGER
CAUTION