9
T51002 E
InstallatIon, servIce and troubleshootIng Procedures
OPERATION
TIREMAAX
®
PRO and CP function similarly for tire
inflation. Deflation is a function of TIREMAAX
®
PRO
only. No operation is required by the driver / operator
for either system to function normally. However, the
Indicator Lamp should be monitored to verify system
function and integrity. The Indicator Lamp is located in
the front of the trailer (Figure 4 on page 12) or in a
location within view of the driver from the cab.
HOW THE SySTEM OPERATES
TIRE INflATION
The TIREMAAX system is set to a specified
target
pressure
for inflation. As long as the pressure in
the trailer air tank is above the target pressure, the
controller will continuously supply and maintain tire
pressure at target.
NOTE:
For the TIREMAAX controller to function
properly, trailer air must be clean, dry and
tank pressure must be greater than the
tire target pressure. The controller cannot
supply pressure above the available air tank
pressure.
When functioning normally, the trailer air tank will
supply air pressure to the TIREMAAX controller. The
controller will deliver regulated air to pressurize air
lines and tires to the target pressure. For TIREMAAX
PRO, all check valves are open allowing air to flow in
both directions with the same psi throughout.
If tires are low
, air from the trailer air tank will
continue to inflate tires to the target pressure. Delivery
(regulated) air flowing from the controller to air lines
and tires may cause the indicator lamp to remain
lit until the target pressure is reached. The controller
delivers constant pressure to lines and tires to
maintain target pressure.
If there is a tire leak or leak in the lines
, the
indicator lamp may or may not remain on. Refer to
TROUBLESHOOTING on page 37.
• If the indicator lamp (Figure 2) remains on for
more than 10 minutes, the system is attempting to
inflate the tires but may not be able to adequately
maintain proper tire pressure. The operator should
stop and check the tires to determine if it is safe to
continue to operate the vehicle and should seek
service at the next opportunity.
• The remaining tires are protected from pressure
loss by integral valves located in each tire hose or
hubcap.
TIRE DEflATION
(TIREMAAX
®
PRO only)
A common cause of pressure variance in tires
is temperature (Figure 55 on page 56). Tire
temperature and pressure can rise when:
• Transporting from cold to warm or hot weather.
• Inflating while cold, then tires heat up during
operation of the trailer.
• Tire temperature increases with speed.
• Tire pressure is affected by a change in elevation.
Deflation pressure is set at a fixed value greater than
the target pressure
2
. If the tire pressure increases
above this setting, the TIREMAAX PRO controller will
exhaust air and maintain pressure at this higher value.
Cooling tires may result in tire pressure dropping
below the target pressure while parked. This may
illuminate the indicator lamp at start-up. Refer to
GLOSSARY on page 55 for examples of temperature
effects on tire pressure.
2
TIREMAAX
®
PRO target pressure and deflation pressure are factory
preset to trailer OE specifications. Hendrickson presets the deflation
pressure at 10 psi above target pressure.