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 TM 55-1925-273-10-1
0039 00
SYSTEM RELIEF VALVE
A single system relief valve (figure 1, item 4) provides protection against overpressurization of the central hydraulic system.
If the system pressure exceeds 2700 PSI (186 bar), the relief valve opens and vents the excess pressure back to the reservoir.
SYSTEM PRESSURE GAUGE
A system pressure gauge (figure 1, item 5) provides a direct indication of the system's operating pressure. The gauge reads
from 0 to 5000 PSI (0 to 345 bar).
RESERVOIR
A 150 gallon (568 liter) reservoir (figure 1, item 6) stores the hydraulic fluid for the central hydraulic system. The
reservoir also provides a mounting location for most of the central HPU's components. The central hydraulic system's
fluid is cooled by dissipating its heat through the walls of the reservoir to the air in the engine room. Hydraulic fluid
coolers (figure 1, item 7) are provided for the hydraulic pump drain fluid. These hydraulic fluid to air coolers are
mounted inboard of the electric motors.
SUCTION AND RETURN FILTERS
Suction strainers (figure 1, item 8) are provided at the inlet for each hydraulic pump (figure 1, item 1) to remove large
particulate matter from the hydraulic fluid before it enters the hydraulic pump. Return filters (figure 1, item 9) are
also provided for the system. The return filters are rated at 10 microns and remove small particulate matter from the
hydraulic fluid as it is returned to the reservoir.
SAFETY MONITORING AND SHUTOFF DEVICES
A 0-250 F (-17 to 121 C) temperature gauge (figure 1, item 10) is provided to monitor hydraulic fluid temperature in the
reservoir. The temperature gauge is supplemented by a 180 F (82 C) high temperature cutoff switch (figure 1, item 11).
When the hydraulic fluid temperature exceeds 180 F (82 C), the cutoff switch illuminates the HIGH OIL TEMP lamp,
sounds an alarm, and secures power to the hydraulic pumps' electric motors (figure 1, item 2). The central hydraulic system
is also protected by a low level switch (figure 1, item 12). This switch indicates either FULL or LOW for the reservoir fluid
level. When the hydraulic fluid level reaches the LOW mark (98 gallons (371 liters)), the switch illuminates the LOW OIL
LEVEL lamp, sounds an alarm, and secures the power to the hydraulic pump's electric motors.
CENTRAL HYDRAULIC POWER UNIT MOTOR CONTROLLER
The central hydraulic power unit motor controller (figure 2, item 1), mounted forward and above the system's reservoir,
provides the primary source of control for the central hydraulic system. Remote START/STOP control of the system is also
provided via controls on the EOS console (figure 3).
The central hydraulic power unit motor controller contains a REMOTE/OFF/ON selector switch (figure 2, item 2). This
switch permits the operator to determine whether the ON/OFF control will be achieved locally (OFF and ON positions) or
remotely (REMOTE position) from the EOS. The P1/P2/P1&P2 selector switch (figure 2, item 3) permits the operator to
select which pump(s) will operate when the system is turned ON. The MAIN SWITCH (figure 2, item 4) is the primary
power disconnect for the system's electric power. READY (figure 2, item 5) and RUNNING (figure 2, item 6) indicator
lights are provided for each pump to indicate the pump's condition. LOW OIL LEVEL (figure 2, item 7) and HI OIL TEMP
(figure 2, item 8) lights are also provided to signal these alarm conditions. The final components of the control panel are the
reset switches (figure 2, item 9). These pushbutton switches permit the operator to reset the electric motor(s) after the
thermal resets have tripped.
0039 00-2
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