SECTION 4 DE-18 USER MANUAL
35
The same fan also cools the compressed air after
each stage of compression and the compressor
lubrication system. Prior to passing through the
radiator, the fan air also passes through the
intercooler, aftercooler and compressor fluid cooler
(which are mounted adjacent to the radiator).
The same fan also cools the engines intake air
supply and fuel. Prior to passing through the radiator,
the fan air passes through the engines charge air
cooler and fuel cooler. The engine intake air passes
through the air cooler, which helps remove the heat
which was introduced by the engine's turbocharger.
The fuel air-cooler helps cool the diesel fuel for
optimum combustion.
The engine is coupled to the compressor with a non-
lubricated vulcanized rubber disc and drive flange-
type coupling. The package is supplied with a fuel
tank large enough to keep the compressor running at
full load through a full shift. Also supplied are
auxiliary fuel supply and return connections for
longer periods of operation.
4.3 COMPRESSOR UNIT,
FUNCTIONAL DESCRIPTION
DE-18 Series compressors feature a two-stage, oil
free, rotary screw design. The rotor profiles and
stators, some of which are protected with anti-
corrosion coating, deliver near pulse-free
compressed air to meet your demands. The rotor
shafts are mounted on anti-friction bearings and are
sealed by floating carbon ring/stainless steel cage
assemblies. Both stages are driven by a common
bull gear and speed optimized individual pinions, and
are precisely mounted to the rigid gear box. Timing
gears synchronize each male/female rotor pair for
contact-free operation.
A gear-type pump, coupled to the main drive shaft,
supplies the required lubricating oil to the gears, anti-
friction bearings and cooling to compressor jacket.
An all-metal tank, integrally mounted to the
compressor, serves as the sump for the lubrication
system.
The compressor/gear box assembly is driven by the
engine via a torsionally soft, flexible shaft coupling.
The engine is mounted to the gear box through a
rigid adapter which maintains the gear box and
engine shafts in optimum alignment and allows the
driveline assembly to be supported by soft, vibration
isolating rubberized mounts.
Figure 4-3: Load/Unload Capacity Control System
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