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TM 10-4320-307-10
1-14 ENGINE AND ENGINE SYSTEMS.
a.
Operation. The engine provides turning force to the pump rotor. The engine is bolted to the skid
frame. The pumping assembly engine is a Cummins Model NTTA-855-P450 industrial dual turbocharged
diesel capable of providing 450 hp at 2100 rpm while in continuous operation. The engine is equipped with the
following major engine subsystems.
(1) Air Intake System. The engine is equipped with a heavy-duty reusable air cleaner. The air cleaner
has a primary filter, an ejector valve, and a restriction indicator on its suction piping. The primary
filter element, which may be reused, is easily removed and may be cleaned with air or water.
(2) Lubricating System. The engine lubrication system is provided with a pressure relief safety valve
to prevent damage to various engine parts and seals. The engine is also provided with a port to
sample oil for testing and an oil sump with a plug and drain tube. Under normal conditions,
prelubrication of the turbocharger bearings is not required since there is an oil residual in the turbo
bearing that will lubricate the turbo on startup. After long storage or following emergency hot
shutdown, lubrication is required for all turbocharger and engine bearings. Lubrication of the
turbocharger bearings is accomplished using the normal engine lubrication system without tools or
disassembly.
(3) Fuel System. The fuel system consists of a precleaner, hand pump, fuel feed pump, injection
pump, injectors, and dual fuel filters. The primary filter is a water separating type. Two 3-way
valves with corrosion resistant tags marked OFF, UNIT TANK, and AUXILIARY are connected by
the fuel supply and return line to a 110-gallon fuel tank.
(4) Cooling System. The engine is equipped with a water pump and heavy duty radiator capable of
maintaining the specified coolant temperature during maximum operating conditions. The radiator
may be cleaned from the front using compressed air.
(5) Electrical System. The 24-volt electric power necessary to start the engine is provided by four lead
acid 12-volt batteries. Pressing the START switch on the control panel activates the engine starter
motor and simultaneously opens the fuel system solenoid. A three-phase alternator provides
automatic charging of the batteries through a voltage regulator. An auxiliary charging receptacle is
provided to charge the batteries from a remote power source.
1-12
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