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Page Title:
TABLE 2-1 CONTROLS AND INSTRUMENTS |
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 TM 55-4920-442-13&P
TABLE 2-1 CONTROLS AND INSTRUMENTS
Item No.
Hydraulic Schematic
Nomenclature
Function or Use
Hourmeter
--
Monitors Hydraulic Test Stand usage
Low Pressure Gage
8
Indicates output pressure of boost pump
Oil Temp Gage
12
Indicates temperature of hydraulic fluid
at LP filter outlet
High Pressure Gage
21
Indicates output pressure of system
Fill Pressure Gage
26
Indicates output pressure of fill pump
4-Way Valve
32
Directs hydraulic fluid flow to aircraft
or test stand reservoir
Bleed Valve
4
Bleeds air from system at LP filter
Sight Gage
3
Flow of air-free fluid may be observed
Flowmeter
1
Indicates volume of fluid returning to
system
Fill Pressure
29
Bleeds over pressured hydraulic fluid
Relief Valve
in fill line to the reservoir
Selector Valve
25
Selects pressure source to be monitored
by low pressure gage - low pressure filter
inlet, low pressure filter outlet or
suction return line and low pressure
gage calibration
HP Bypass Valve
30
Bypasses fluid from high pressure outlet
line to suction return line
HP Gage Shut-Off
18
Isolates HP gage from system
Valve
HYD Oil Gage
--
Indicates level (amount) of hydraulic
fluid in test stand reservoir
HP Filter
--
Lights when high differential pressure
P Indicator Light
exists across HP filter
LP Gage Test Port
9
Allows external calibration of LP gage
HP Gage Test Port
9
Allows external calibration of HP gage
Table 2-1 (Continued next page)
2-9
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