Hydraulic Systems
Citation Bravo
Developed for Training Purposes
5G-5
March 2009
Hydraulic
System
The Citation BRAVO's open center
hydraulic system was chosen for its
light weight, low component wear,
and reduced leakage. The majority
of the system components are in the
tailcone.
The system components include:
n
reservoir
n
firewall shutoff valves
n
pumps
n
filters
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flow switch/check valve
n
center bypass and relief valves
Reservoir
The hydraulic reservoir
(Figure 5G-
1)
is in the tailcone. The entire sys-
tem contains only 3.9 gallons of
hydraulic fluid with the reservoir
holding a maximum of 0.6 gallons.
Normal fill level is 0.5 gallons.
A spring maintains a minimum of
2.7 to 4 PSI positive pressure on the
reservoir at all times. A boot strap
pressure line carries high pressure to
a counter-balance piston, preventing
fluctuations in reservoir pressure
during operation.
A pressure relief valve in the low
pressure area of the reservoir begins
to open at 40 PSI and fully opens at
60 PSI. With the reservoir filled to
capacity, the relief valve opens to
drain excess fluid.
A plunger type sight gauge attached
to the reservoir
(Figure 5G-1)
pro-
vides a visual indication of the reser-
voir fluid level. The sight gauge has
three indication marks:
n
REFILL - 0.2 gallons
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FULL - 0.5 gallons
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OVERFULL - 0.6 gallons.
When the plunger drops below the
REFILL indication, a microswitch
attached to the sight gauge activates
the LO HYD LEVEL annunciator.
Firewall Shutoff
Valves
Pressing the right or left ENG FIRE
switch light activates a motor-driven
hydraulic firewall shutoff valve. The
valves are mounted between the
hydraulic reservoir and the suction
side of each engine-driven pump.
Closing a firewall shutoff valve
stops the supply of hydraulic fluid
from the reservoir to the hydraulic
pump. Activating the ENG FIRE
switchlight a second time opens the
respective valve.
A thermal relief valve in the hydrau-
lic firewall shutoff valve relieves
pressures in excess of 75 PSI
between the closed valve and the
engine-driven pump.
5G-1
Summary of Contents for Citation Bravo
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