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TM 10-4320-343-14
2.1.3 Oil Pressure Bypass (3). This switch is a pushbutton type switch and is used to bypass oil pressure sensing
circuits. Switch must be pushed in simultaneously with start switch during engine start. Oil pressure bypass switch must
be released after oil pressure buildup.
2.1.4 Oil Pressure Gauge (4). This gauge indicates engine oil pressure in pounds per square inch(PSI). The gauge
graduated in 10 pounds increments from 0 to 80 PSI.
2.1.5 Tachometer/Hourmeter (5). Indicates engine speed in revolutions per minute (RPM). Meter is graduated in 100
RPM increments from 0 to 3000 RPM. The hourmeter portion of the gauge indicates the total number of hours the engine
has been operated.
2.1.6 Ammeter (6). Indicates alternator ampere output. Meter is graduated in 30 amp increments from 0 to +60 AMPS
and from 0 to -60 AMPS.
2.1.7 Suction (7). This gauge is marked SUCTION and indicates pump suction pressure and vacuum per square inch
(psi). Gauge is graduated in one unit increments from 0 to 30 PSI for both vacuum and pressure with numerals at five unit
intervals on the pressure side and at 10 unit intervals on vacuum side.
2.1.8 Discharge (8). This gauge is marked DISCHARGE and indicates pump discharge pressure in PSI. Gauge is
graduated in 5 pound increments from 0 to 160 PSI with numerals at 20 PSI intervals.
2.1.9 Handpump (9). Used to pressurize cold start reservoir. If outside air temperature is below +40°F (+5°C) cold start
system may be used to assist in starting engine. Handpump is not used on the electrical system, Model 350 PAFN.
2.1.10 Throttle (10). This control is only used on the unregulated models. Provides manual speed selection for the 350
GPM Pumping Assembly. Turning the throttle control counterclockwise increases engine speed. Clockwise rotation
decreases engine speed.
2.1.11 Manual Speed Control (11). This control is only used on regulated models. When the mode selector is in
MANUAL position, this control provides for manual control of engine speed from IDLE (low speed ) to HIGH (full speed).
2.1.12 Mode Selector Switch (12). This control is used only on regulated models, Models ADC1500 and 350 PAFN.
The control provides three mode selections for the regulator, The three modes are as follows:
START
Connects regulating system to pumping assembly starting circuits.
Manual
Establishes control over engine speed by use of MANUAL SPEED CONTROL.
AUTO
Provides automatic pump discharge pressure and engine speed regulation.
2.1.13 RHEOSTAT/Knob (Light Switch). Used to control illumination brightness of panel lights by turning the knob
mounted on the rheostat clockwise or counterclockwise. Rheostat/Knob is not installed on some models.
2.1.13 Panel Lights. Provides light for the control panel. Panel lights are mounted on support brackets and the hoods
are equipped with aviator's night vision. Model 350 'AFN has four panel lights. (Panel lights are not installed on all
models).
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