(a) Air cleaner restriction indicators .
simultaneously with the safety pushbutton switch when
indicators monitor the air pressure drop through the air
starting the engine.
cleaners (engine and compressor intake). As long as
the pressure drop is within satisfactory limits, the
(j) Safety switch. The safety pushbutton switch is
indicators show green. When intake air is restricted by
pressed simultaneously with the start switch when
dirty air cleaner elements, or any other reason, the
starting the engine. Pressing the switch overrides the
indicators show red. After the restriction is cleared by
normally open engine oil pressure safety switch. The
cleaning the air cleaner elements, or removing
switch is held in until oil pressure of 4 PSI (0.3 KG/CM2)
restriction, the indicators must be reset. Reset by
is indicated on the engine oil pressure gauge.
pressing down on top of the indicator cap until green is
(k ) Ignition on-off switch. The ignition on-off switch
is pulled outward to the ON position to energize the unit
(b) Lamp switch. This toggle switch operates the
electrical system for starting. The switch remains in the
instrument panel lamp. A switch plate indicates the ON
ON position during operation. To stop the engine, the
and OFF positions. The ignition switch must be in the
switch is pushed in to the OFF position. This action
ON position to energize the lamp switch.
interrupts the fuel injection pump solenoid circuit, which
is energized to run, thereby shutting off fuel supply to
(c) Receiver pressure gauge. This gauge indicates
the pressure of the compressed air in the oil separator
tank. Normal operating range is 80 to 105 PSI (5.6 to
(I) Compressor unloader control cable. This control
cable is used to actuate the compressor intake valve
plate. Closing the valve plate allows the unit to be
(d) Engine water temperature gauge. This gauge
started with the compressor unloaded. The control cable
indicates the temperature of the engine cooling water.
handle is turned counterclockwise to unlock and then
Normal operating temperature range after warm-up is
pulled outward to close valve plate (unload compressor).
160 to 190F (71 to 88C).
The handle is then turned clockwise to lock in position.
Unlock handle, push in, and lock when operating
(e) Engine oil pressure gauge.
temperature of engine is achieved.
indicates the engine lubricating oil pressure being
circulated through the engine. Normal operating range
(m) Idle control cable. The idle control cable is used
is 40 to 60 PSI (2.8 to 4.2 KG/CM2) at full load and 15 to
to manually set engine speed in idle position for starting.
25 PSI (1.1 to 1.8 KG/CM2) at idle.
Turn handle counterclockwise to unlock, pull handle
outward until it stops; then turn handle clockwise to lock.
(f) Fuel Gauge. The fuel gauge indicates the level
When operating temperature is achieved, unlock handle,
of fuel oil contained in the fuel tank. Capacity of the fuel
push in, and lock.
tank is 19 gallons (72 liters).
(n) Compressor oil temperature gauge. This gauge
(g) Fuel pressure gauge. This gauge indicates the
indicates the temperature of the compressor system oil.
pressure of the fuel oil in the engine fuel system.
Normal operating temperature range is 170 to 220F
Normal fuel pressure is 3 to 5 PSI (0.2 to 0.4 KG/CM2).
(77 to 104C).
(h) Quick-start control cable. This control cable is
(o) Ammeter. The ammeter indicates the rate of
used to inject cold weather starting aid fuel into the
battery charge or discharge.
engine air intake.
the speed of the engine in revolutions per minute (rpm).
Normal operating speed is 1100 + 50 rpm when
Do not actuate this control cable at
compressor is operating unloaded and 2200 + 50 rpm
temperatures above 40F (4.4C).
The gauge also records elapsed engine
(i) Start switch. The engine pushbutton start switch
running time in hours and tenths of hours.
is pressed to energize the starting motor solenoid for
cranking the engine. This switch must be pressed