52
T51002 E
InstallatIon, servIce and troubleshootIng Procedures
1. Set the emergency brakes and open the controller
supply valve.
2. Remove regulator cap by pulling to right side.
IMPORTANT: Should the inflation pressure be greater
than the deflation pressure, the system
will continuously exhaust pressure to
maintain the lower delivery pressure. If
the inflation pressure is to be increased
during this procedure, FIRST increase
the deflation pressure at the PRM
(Figure 52) using Step 8 of ADJUST
PRO DEFLATION PRESSURE.
3. Use a
1
/
8
Allen wrench to adjust controller
pressure regulator until desired inflation pressure
is reached:
NOTE: Adjust to desired cold inflation target pressure
and always approach the inflation pressure
setting from an increasing-pressure direction.
A. If delivery pressure is too low, increase
delivery pressure by rotating the regulator
adjustment screw clockwise (as viewed from
the end of the screw).
B. If delivery pressure is too high:
i. Decrease it by rotating the regulator
adjustment screw counterclockwise
(as viewed from the end of the regulator
screw).
ii. Use pressure relief button on target gauge
(Figure 53) to lower delivery pressure at
least 5 psi below the desired inflation
pressure setting. Close valve.
iii. Turn screw clockwise again to the desired
inflation pressure.
4. Reinstall regulator cap.
Adjust PRO DEFLATION Pressure
For proper operation, target deflation pressure must be
set to 10 psi above target inflation pressure.
1. Set the emergency brakes.
2. Close controller supply valve at the controller
(Figure 52 on page 50).
3. Connect clean, dry shop air supply to target
gauge using the
1
/
4
inch quick connect (Figure 53
on page 50). An air supply at least 15 psi
above cold inflation pressure is required.
4. Open gauge shop supply valve. The flowing air
should create an audible sound that will stop
when current deflation pressure is reached.
5. Close gauge shop supply valve.
6. Observe pressure gauge to ensure no leaks are
present and pressure remains constant.
IMPORTANT: If the delivery dump ports constantly
exhaust air, the deflation pressure is set
below inflation pressure.
7. Read and record current deflation pressure
at gauge. If not correct, go to the next step.
Otherwise, go to next procedure.
8. If adjustment is needed, use
1
/
8
inch Allen
wrench to adjust pressure relief set screw
(Figure 52). (A quarter turn is approximately
5 psi.)
A. If deflation pressure is low, turn the pressure
relief set screw clockwise, then return to
Step 4.
B. If deflation pressure is high, turn the
pressure relief set screw counterclockwise,
then return to Step 4.
Restore PRO System to normal operation
At this point, the controller should be set to the desired
inflation and deflation pressure. To restore system to
normal operation:
1. Close controller supply valve on the supply line.
2. Disconnect shop air supply from target gauge.
3. Disconnect target gauge from controller.
4. Close controller, secure latch and ensure
controller supply valve is open.
5. Update decal on controller cover (Figure 44 on
page 36), if necessary.
6. At each wheel end, ensure all tire hoses are
installed and properly secured.
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