COATS 7xxx Series Tire Changer - Manual (Page 29)

Important: Always read and follow operating instructions. • 25
Pressure Limiter Maintenance
DANGER
Operating a tire changer with a defective,
improperly adjusted, or by-passed pressure
limiter could cause an operator to acciden-
tally over pressurize a tire, resulting in a tire
explosion with severe injury or death to the
operator or bystanders.
Always be sure that the pressure limiter is
present and is operating properly.
DANGER
Never inflate tire above manufacturer’s rec-
ommended pressure after bead is seated.
Pressure limiter is set at 60 PSI. Any required
inflation above 60 PSI should be performed
in an inflation chamber/safety cage or
securely mounted on the vehicle if an infla-
tion chamber is not available. A tire explo-
sion may cause personal injury or death to
operator or bystanders.
The pressure limiter helps prevent inflation of standard
size or larger tires or tubes beyond 60 PSI to minimize
risk of explosion. This device is for the safety of the
operator and bystanders. Proper operation of the pres-
sure limiter is essential to safe operation of the machine.
Check operation of the pressure limiter as shown and
described below at least monthly:
1. Remove tires and/or wheels from the machine.
2. Connect the inflation hose to an empty service
tank with a pressure gauge (should read 0). Use a tank
with at least 200 PSI pressure rating.
3. Depress inflation pedal to position 1 to start airflow
through the hose and into the tank. Maintain a steady
pressure for constant flow.
4. Watch the rising pressure on the tank gauge and
the gauge on the machine. Machine gauge should
cycle between check and inflation pressures while tank
gauge climbs steadily. As tank pressure reaches 60 PSI,
the pressure limiter should stop the airflow automati-
cally. Both gauges should read 60 PSI ± 5 PSI.
5. Release inflation pedal. Check manual release
valve function by pressing the button and releasing
pressure from the tank until it reaches 50 PSI. Discon-
nect inflation hose, and release air inside tank.
6. Replace pressure limiter if it fails to cycle properly
during inflation, if it fails to shut air supply off at 60 PSI,
or if it malfunctions in any other way. Do not operate
machine with a faulty pressure limiter.
IMPORTANT: For models with
“Bead Sealing Only” on the tire
changer, maximum limiter pressure
is 15 PSI (NOT 60 PSI).
Watch
Pressure on
Both Gauges
Air Service
Tank
Tire Changer
Infl ation Hose
Connected to
Tank