11
T51002 E
InstallatIon, servIce and troubleshootIng Procedures
COMPONENT DESCRIPTION
This section includes a brief overview of TIREMAAX
®
PRO and CP components. Refer to Figure 2 on
previous page.
TIREMAAX
®
CONTROllERS
The controllers in the TIREMAAX systems control target
pressure and provide protection in case of tire or
system leaks. Two versions are currently available:
CP
Provides constant pressure to tires for
inflation only.
PRO
Provides tire inflation, same as CP, but also
provides a deflation feature.
Controller details:
• Externally mounted on structure under the trailer
(Refer to Figure 29 on page 25):
– Include mounting flanges integral to enclosure.
– Can be mounted on new or existing trailers.
– Sealed lid protects internal components from
environment.
• Internal components include:
–
(Integrated Pressure Control Unit)
»
Regulates air flow from trailer air tank to
tires.
»
Regulated target pressure is set to match
cold tire inflation pressure.
–
(Pressure Relief Module,
PRO only
)
»
Relieves tire pressures that are 10 psi
(69 kPa) above target pressure.
»
Includes adjustment for setting deflation
pressure point. Excess pressure is dumped
out the delivery dump ports.
– (
PRO Only
)
Test port
for connecting
Hendrickson TIREMAAX calibration tool and test
port vent.
– (
PRO Only)
Test port vent
LAMP TEST on page 45 for newer models.
• External connections:
–
Supply port
provides air from the trailer air
tank.
»
Supply valve allows isolation of trailer air
tank pressure for maintenance and other
service functions.
»
Inlet screen reduces contamination from air
supply.
–
Delivery port
feeds regulated air pressure
through air hoses and hubcaps to tires.
–
Petcock valve
(included on CP and older PRO
models) allows trailer-mounted indicator lamp
functionality to be tested. See INDICATOR LAMP
– (
PRO only
)
Emergency (parking) brake port
— when emergency or parking brake is set:
»
Isolates TIREMAAX PRO components from
supply (tank air).
»
Pressure in TIREMAAX delivery lines drop to
zero psi.
NOTICE: While the parking brake is engaged,
delivery air pressure exhausts to zero
psi. Wheel valves close to isolate
tires from the system.
WARNING: While servicing the TIREMAAX PRO
system, it may be necessary to
disengage the emergency brakes
to allow the controller to function.
Trailer wheels must be chocked
during these procedures.
HUBCAP
Although the same casting is used for each hubcap,
TIREMAAX PRO will have the word “PRO” on
the hubcap window. Each hubcap is configured
and assembled to match the requirements of the
application (CP or PRO, grease or oil, etc.) Hubcap
variations are listed in L868 TIREMAAX
NOTE:
For compatibility with hub and wheel-
end components or application concerns,
This assembly:
• Integrates important components relative to
TIREMAAX PRO and CP systems.
• Seals and protects wheel-end components.
• Connects air system from stationary axle to rotating
hub and wheels.
• Includes factory assembled integrated components:
NOTICE: field disassembly of hubcap
integrated components will violate
warranty.
– Rotary union that connects rotating hubcap
directly to stationary axle hose.
