TM-5-4310-389-14
CHAPTER 2
OPERATING INSTRUCTIONS
Section I.
DESCRIPTION AND USE OF THE OPERATOR'S CONTROLS
AND INDICATORS
2-1 GENERAL. The instrument panel is located on the front side of the unit. It contains all the operator's gauges,
switches, valves, and controls with the exception of the clutch control lever, ether injector, and engine throttle. See
figure 2-1 for instrument location and paragraph 2-2 for functional description.
2-2 OPERATOR'S CONTROLS AND INDICATORS .
a. Service Line Pressure Gauge (1). This gauge indicates the air pressure delivered to the service outlet (O to 5000
psi).
b. Final Pressure Gauge (2). This gauge indicates the air pressure discharged from the final (fourth) stage (1800 to
5000 psi).
c. Compressor Oil Pressure Gauge (3). This gauge indicates the lubricating pressure in the air compressor. Pressure
normally reads between 750 to 870 psi.
d. Hourmeter (4). The hourmeter is electrically operated and indicates total running hours of the compressor from
0000.0 to 9999.9.
e. Ammeter (5). The ammeter indicates the operation of the alternator; it normally reads positive.
f. Engine Head Temperature Gauge (6). This gauge indicates the temperature in the engine head; it normally reads
170OF to 2700F.
g. Engine Oil Pressure Gauge (7). This gauge indicates the oil pressure in the engine; it normally reads 30 to 90 psi,
with a minimum of 15 psi.
h. Ignition Switch (8). This is a three-position switch. Moving the lever to the ON position on the right energizes the
electrical system. Moving the lever to the START position runs the starter motor. After the engine starts, move the
lever back to the RUN position.
i. Relay Latch (9). This button activates the automatic shutdown if the engine or compressor temperatures are
excessive or if oil pressure is abnormal. The relay latch button must be pushed in before starting engine.
j. Safety Bypass Switch (10). The safety bypass switch is used for normal starting to bypass the compressor oil pressure
switch. Turn to ON before starting. Turn to OFF after oil pressure is established.
2-1
