41
T51002 E
InstallatIon, servIce and troubleshootIng Procedures
PROBABLE CAUSES DESCRIPTION RECOMMENDED FIX
11
Controller
component leak
If air is exhausting from the controller enclosure,
first check Effect K. If air is leaking from the test
port, check probable cause 25.
Controller leaks can be caused by operator error,
damage, corrosion, worn or malfunctioning
components.
I. Check controller enclosure and components for
possible damage and leaking.
II. If CP or previous version of PRO controller, check
the petcock (if included). It should be closed
tightly.
III. If current PRO controller, check the test port vent
for proper installation, Figure 47 on page 45.
IV. Unless the leaky component is an external OE
supplied fitting, replace controller.
12
Inflation/
Deflation PSI set
too close
This applies to TIREMAAX
®
PRO only.
If target pressures for inflation and deflation are
set too close, air added through the regulator may
be bled out by the PRM. If deflation is less than
inflation, regulated air will continuously exhaust
from the delivery dump ports (Figure 52 on
page 50).
Perform SETTING TIREMAAX
®
PRO TARGET PRESSURE
on page 50.
Equipment
4
13
Controller
malfunction
Once closed and sealed, the internal components
are protected. However, environmental changes
and external influences from air supply can effect
component operation.
For PRO, excess pressure is exhausted from the
delivery dump ports within the controller (Figure 52
on page 50); this is normal.
I. Check controller for damage.
II. Perform CHECKING FOR AIR LEAKS on page 44
for components inside the controller and external
fittings.
III. Repair
4
or replace as needed.
IV. Refer to probable cause 25.
14
Debris
(blockage) in air
system
The supply valve (Figure 49 on page 47)
includes a screen to filter larger debris from entering
and contaminating the air within the system.
However, should passable bits of debris collect
at any point within components of the system, a
blockage can occur. Regular maintenance of the
compressor and air tank can help to avoid this
problem.
I. Check and clean the screen filter at the supply
valve. Replace valve as needed.
II. If the effect of a possible blockage can be
narrowed with the matrix, disconnect fittings and
hoses to clear the suspected blockage.
4
III. If attempts to clear the suspected blockage fail,
replace components as needed.
15 Pinched line Air line is kinked or pinched between objects. Make corrections as needed.
16
Ice in system Moisture and low temperatures can combine to
form ice particles in the system plumbing. This
can lead to blockages or diminished air flow and
corrosion.
I. Park trailer in warm environment.
II. Bleed moisture from air tank.
III. Check drier at compressor (TMC RP 637).
IV. Replace components that show evidence of
corrosion.
V. Perform CHECKING FOR AIR LEAKS on page 44
for components inside the controller and external
fittings.
17
PPV not
functioning
The Hendrickson PPV has an opening pressure of
75
±
5 psi and a closing pressure of 70
±
5 psi. For
various reasons, it may fail to open or close.
If the pressure in the tank is known to be above 80 psi
and the valve remains closed, replace the PPV.
18
Tire hose not
properly clocked
Improperly installed (clocked) tire hoses can lead
to stretching or expose tire hoses to objects that can
damage the tire hose.
Refer to and review TIRE HOSE INSTALLATION on
page 23 to determine if properly installed and
clocked. Make corrections as needed.
19
Problem
in hubcap
assembly
3,
4
The hubcap contains moving parts, valves and
other components that have the potential for
mechanical issues caused by debris and/or
contaminants.
If contamination is suspected, refer to probable cause
14.
Replace entire hubcap assembly as needed.
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