SECTION III. PRINCIPLES OF OPERATION
The 350 GPM pumping assembly is a movile pump that transfers water.
It is trailer mounted and is towed by a vehicle
for short distances.
When moved, the 350 GPM pumping assembly is connected from the towing vehicle, and then
stabilized. Hoses are connected to the equipment between the water source and destination. The engine is started and
the water flow is controlled by gate valves. The following paragraphs provide a functional description of the 350 GPM
1.14.1 Operators Functional Description.
Exhaust System. The exhaust system consists of the muffler, exhaust tubing, and spark arrester. The
exhaust system provides a noise reduction.
Air Cleaner. The air cleaner provides filtered air to the combustion chambers of the engine. It consists of
two filters that filter the air before it reaches the intake manifold of the engine.
Electrical System. The electrical system provides the power to drive the pump assembly and is controlled
by either a mechanical or electrical control device.
Fuel System. The fuel system is attached to the fuel tank and provides fuel to the engine. The amount of
fuel going to the engine determines the engine speed. On the pumps covered in this manual engfine speed is controlled
manually by a knob/control rod arrangement,
Engine Assembly. The engine assembly provides the power to operate the centrifugal pump assembly and
is controlled by either a mechanical or electrical control device.
Control Panel Assembly.
The control panel assembly provides the controls and indicators indicated below. They are further discussed in Chapter
2 under controls and indicators.
Emergency Stop Switch
Push to Start Switch
Oil Pressure Bypass Switch
Oil Pressure Gauge
Panel Lights(Model 350 PAWN)
Pump Assembly. The pump assembly is the unit that actually transfers fuels from a source (storage tank,
railroad car, ship etc) to a destination point that may be another tank, downstream boost pump or using vehicle etc. All
other components support this function. The pump assembly consists primarily of an impeller, driven by the engine, and
a metal housing that surrounds the impeller. It is normally self priming, but includes a priming port that can be used if the
pump fails to prime because of large differences in altitude between the pump and the source of fuel, pump wear and other
Fuel Tank The fuel tank provides storage for diesel fuel. It has a 19 gallon (71.9 liter) capacity, The tank
has a fuel level gauge, two fuel source selector valves, filler cap, drain plug, and overflow return fitting. Thefuel level gauge
provides a visual indication of the fuel level inside the tank. Fuel is added to the tank via the filler cap.
Wheel Mounted Frame Assembly. The wheel mounted frame assembly allows the 350 GPM Pumping
Assembly to be towed behind a movile vehicle for short distances.
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