Table 4-5.—A/M27T-5 Main Control Panel Controls and Indicator—Continued
FIG. 7-12
INDEX NO.
CONTROL/INDICATOR
FUNCTION
13
EMERGENCY STOP RESET
Used to open diesel engine air inlet housing
handle
shutdown valve after diesel engine emergency
shutdown. Handle pulling action is transmitted by
sheathed cable to valve lever.
14
PRESS. OUTLET FLOWMETER
Indicates hydraulic fluid flow to high pressure port
(2 to 30 gpm).
15
COMPENSATOR CONTROL
Adjusts pressure at which compensation occurs in
high pressure pump when power supply is being
used as a high pressure system.
16
PUMP CASE FILTER indicator
Illuminates when pump case drain filter high
(DS5)
differential pressure switch S3 closes. S3 will close
if the pump case drain filter input and output
pressure differ by 35 psi or more.
17
LOW PRESS FILTER indicator
Illuminates when low pressure filter high
(DS6)
differential pressure switch S4 closes. S4 will close
if low pressure filter and inlet and outlet pressures
differ by 50 psi or more.
18
COMPOUND GAUGE
Function depends on setting of PRESSURE
SELECTOR VALVE (see 21, below). Calibrated to
indicate 0 to 30 inches Hg vacuum and 0 to 300 psi.
19
Compound gauge calibration
Used to calibrate COMPOUND GAUGE when
screw
PRESSURE SELECTOR VALVE is set to
CALIBRATE GAUGE.
20
L.P. GAUGE TEST port
Allows application of hydraulic fluid from external
source for use in testing and calibrating
COMPOUND GAUGE. Used only when
PRESSURE SELECTOR VALVE is set to
CALIBRATE GAUGE.
21
PRESSURE SELECTOR VALVE
4-position, 5-way valve. Acts as a hydraulic switch
for connecting COMPOUND GAUGE to hydraulic
pump or power supply return line. H.P. PUMP
INLET and BOOST PUMP INLET settings connect
COMPOUND GAUGE to hydraulic pump high
pressure and boost pump inlets, respectively.
RETURN BACK PRESSURE connects
COMPOUND GAUGE to power supply return line.
CALIBRATE GAUGE isolates COMPOUND
GAUGE from hydraulic system enabling calibration
of gauge.
4-29
