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TM 10-4320-342-24
1-11. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - continued.
j.
(11)
Engine. The engine is mounted to the engine mounts on the frame. Its purpose is to drive the 200/600
GPM fuel pump. It consists of a compressor, gearbox, turbine wheel, enclosure, combustion assembly and
electronic sequencing unit.
k.
(12)
Boost Pumps. Three boost pumps are provided on each unit. The first supplies a positive pressure of fuel
to the fuel control module on the turbine. The second supplies a positive pressure of oil to the inlet of the speed
reducer. The third removes oil from the speed reducer and returns it to the reservoir.
l.
(13)
Fuel/Oil Filters. Provides clean/oil by separating the dirt and water from the contaminated fuel/oil before
entering into the gas turbine. Filter assembly is an aluminum construction with operating pressure of 3000 psi at
6 gpm. Also, filter assembly includes an 40 micron element, visual differential pressure indicator and bypass
relief valve. When fuel/oil is flowing through the filter assembly a drop in pressure occurs between the inlet side
and outlet side. This is due mainly to the flow resistance of the 40 micron element. As contaminates (dirt, water,
etc) are collected by the 40 micron element, the drop in pressure increases. Eventually, when the pressure drop
reaches 15 psi, the visual differential pressure indicator turns from gold to red. This enables the operator to
detect contaminant build up before the 40 micron element is completely plugged and provides ample time to
change the 40 micron element. If, the 40 micron element is not changed, the bypass relief valve will activate
when the differential pressure reaches 17 psi and start bypassing the 40 micron element within the filter
assembly. The bypass relief valve will continue bypassing until the 40 micron element is changed.
m.
(14)
Speed Reducer. A reduction gear system is used to reduce the speed of the turbine (12,000 rpm) to the
operating speed of the pump (8,000 rpm).
n.
(15)
Clutch. An electromagnetic clutch is incorporated int he centrifugal type pump adapter assembly. The
clutch permits decoupling of the centrifugal type pump from the turbine during starting and priming.
o.
(16)
Air Filters. Provides clean air for the turbine inlet by separating the dirt particles and water droplets from the
contaminated air. The contaminated air entering the filter is given a swirling motion induced by the vortex
generator. This swirling motion separates the dirt particles and water droplets leaving on the clean air to pass
through the filter. The dirt particles and water droplets are scavenged out the exhaust.
1-6
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