Operating instructions

TM 55-4920-394-13&P
Table 2-1. Controls and Instruments
CONTROL OR INSTRUMENT DESCRIPTION AND FUNCTION OR
LOCATION OPERATION
FAN SWITCH Off-On toggle type on Starts fan motor on
panel cooler
FLOW CONTROL valve Plug type throttling Control flow of
valve on main control fluid to test stand
panel outlets.
Fluid sampling valves Needle valve on panel Permit taking sample
of pressurized fluid
at output if desired.
FLUID BYPASS valve Plug type throttling Bypasses fluid from
valve on main control pressure outlet to
panel suction return line.
HIGH PRESSURE TEST Test connection on panel External calibration
on high pressure
gauge.
HIGH PRESSURE GAUGE Needle type on panel Isolates fluid pres-
SHUT OFF valve sure gauge from
system outlets for
positive reading and
external calibration.
HIGH PRESSURE RELIEF Adjustable pilot- Selects pressure at
valve operated type with lock which high pressure
nut on panel fluid is
bypassed to
suction return line.
RESERVOIR SELECTOR Handle at top of control Selects test stand
panel or ship reservoir.
VOLUME CONTROL Manual control with lock Regulates maximum
ring on high pressure high pressure fluid
pump on lower sub-panel delivery from 0 to
30 gpm.
PRESSURE CONTROL Screw shaft adjustment Maintains constant
on high pressure pump on pressure in hydrau-
lower sub-panel lic system as de-
livered by pump.
Fluid Temperature gauge -20 degree to 200 de- Indicates fluid
grees F temperature in- temperature at high
dicator on panel pressure pump inlet.
2-4