TM 5-4320-302-14
Section III. TECHNICAL PRINCIPLES OF OPERATION
1-15. CENTRIFUGAL PUMP UNIT
The centrifugal pump mounts on a skid in line with a 35 horsepower diesel engine. Power from the engine is transferred
to the pump through a direct drive coupling for maximum torque at rated output. The pump is auxiliary (exhaust) primed
(a check valve retains water in the pump body), and is capable of variable speed operation. The pump has a capacity of
200 gallons per minute at 300 feet total head. The pump is equipped with female, 2-1/2-inch NPT suction and discharge
ports. The continuous-duty, air/oil-cooled diesel engine uses a 12-volt electrical system, and is equipped with electric
start, spin-on oil and fuel filters, a heavy-duty dry-type air cleaner, and a control panel.
(A)
ENGINE. Bolted to the skid assembly.
Provides the power necessary to drive the
pump.
(B)
CENTRIFUGAL PUMP. Bolted to the skid
assembly. Uses power from the engine to
pump water from the suction port to the
discharge port.
(C)
SKID. Provides a movable mounting platform
for the engine and pump assemblies.
The following text functionally describes the interaction of unit components during operation.
(A)
ENGINE
1. ELECTRICAL SYSTEM. Major functional components include a battery, starter motor, alternator, and
wiring harness. The battery provides electric power to run the starter motor and start the engine. The
alternator recharges the battery after the engine is started, and provides power to all electrical components
through the wiring harness.
2. LUBRICATION SYSTEM. Major components include a lube oil pump, lube oil cooler, and lube oil filter.
The lube oil pump pumps oil to reduce friction between moving parts,
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