TM 5-2350-378-23&P
0025
NOTE
Electrical solenoid valves V1 through V20 can be opened and closed by using the
LINE UP and LINE DOWN buttons on the HDC Control Box to select a valve, and
then pressing the CHANGE POSITION button to open or close the valve. The HDC
Control Box software allows up to four of the solenoid valves (V1-V20) to be powered
ON at one time. Pressing the RESET VALVES button returns all solenoid valves to
their normal (default) operating position (power to the valves is OFF).
Valves V21 and V22 are manually operated, and are located in the bowl area, near
the high pressure filters.
Valve V23 is also manually operated, and is located in the bowl area, on the front of
the Directional Control Valve (DCV) bank. It is operated while standing in the bowl.
This valve is used to interrupt hydraulic fluid flow to the ejector. It is recommended
that the engine be shut down when operating valve V23, for safety purposes.
o.
Use LINE UP or LINE DOWN buttons to scroll to desired solenoid valve number and select CHANGE
POSITION to energize (open or close) valve. Note: A maximum of four valves can be powered on at one
time. If a solenoid valve circuit has failed, CIRCUIT FAULT will be displayed next to the solenoid valve
number on the HDC Control Box LCD display and that valve cannot be selected/powered.
p.
After solenoid valves are selected, read applicable hydraulic line pressures on the other LCD. If a
hydraulic pressure transducer circuit has failed, a CIRCUIT FAULT message will be displayed next to
the transducer number and the pressure will not be displayed.
q.
Use "RESET VALVES" to place all solenoid valves in their normal de-energized (un-powered) position.
r.
Select "CHANGE" to adjust display lighting.
4.
Transducer T7, T8, T9, T10, T11, T12, and T13 check:
a.
Have the vehicle operator move the SPRUNG/UNSPRUNG lever to the UNSPRUNG position.
b.
With the vehicle running, confirm that T7, T8, T9, T10, T11, T12, and T13 read greater than 2500 psi
(17236.89 kPa). (This is the pressure provided by the compensating pump, and it indicates that
transducers T7 through T13 are working properly).
5.
Transducer T5 check:
a.
Push the RESET VALVES button on the HDC Control Box, and verify that all the valves are set to the
power OFF setting and are in the default position as shown in Table 1.
b.
Verify that the SPRUNG/UNSPRUNG lever is in the UNSPRUNG position.
c.
Have the vehicle operator move the right SUSPENSION CONTROL lever to the RAISE position, and
hold it there until the vehicle reaches the maximum height.
d.
Verify that the pressure reading for T5 is at least 2,800 psi (19305.32 kPa). (T5 is now indicating the
pressure setting of the right suspension relief valve, and indicates that transducer T5 is working properly.)
e.
Have the vehicle operator release the right SUSPENSION CONTROL lever.
6.
Transducer T6 check:
a.
Push the RESET VALVES button and verify all the valves are set to the power OFF setting and are in
the default position, as shown in Table 1.
b.
Verify that the SPRUNG/UNSPRUNG lever is in the UNSPRUNG position.
c.
Have the vehicle operator move the left SUSPENSION CONTROL lever to the RAISE position, and hold
it there until the vehicle reaches the maximum height.
d.
Verify that the pressure reading for T6 is at least 2,800 psi (19305.32 kPa). (T6 is now indicating the
pressure setting of the left suspension relief valve, and indicates that transducer T6 is working properly.)
0025-6
03/15/2011Rel(1.8)root(maintwp)wpno(M10001)
