2
DETROIT DIESEL CATERPILLAR
FIGURE 2 - TYPICAL COMPRESSOR DRIVE FLANGES
FIGURE 3 - DURAFLO
™
596 AIR COMPRESSOR UNLOADER SYSTEM
DURAFLO
™
596
COMPRESSOR
SUPPLY
RESERVOIR
AIR
DRYER
SYNCHRO VALVE
GOVERNOR
assembly using two cap screws and the cylinder head is
secured to the cylinder block with six cap screws. The
cylinder head, with the valve body halves comprise a
complete cylinder head assembly.
The cast iron crankcase and cylinder block assembly, houses
the pistons, connecting rods, crankshaft and related
bearings. Unloader plungers and related seals and springs
are contained in bores in the cylinder block. Sliding inlet
valves and their pivot arms are sandwiched between the
cylinder block and valve body assembly.
The DuraFlo
™
596 compressor incorporates an unloader
system that features an energy saving system or ESS which
reduces compressor power consumption by approximately
80% in the unloaded mode. The ESS also reduces
compressor oil consumption (oil passing) when the
compressor is in the unloaded mode.
A nameplate identifying the compressor piece number and
serial number is attached to the end of the cylinder block
opposite the drive end.
OPERATION
The compressor is driven by the vehicle engine and func-
tions continuously while the engine is in operation. Actual
compression of air is controlled by the compressor un-
loading mechanism operating in conjunction with a remote
mounted governor and synchro valve. Unlike the Tu-Flo
®
compressor series, the DuraFlo
™
compressor requires the
addition of a synchro valve to assure proper operation and
service life. The governor and synchro valve combination
maintains brake system air pressure between a preset maxi-
mum and minimum pressure level. Refer to Figure 3.
The compressor has a built in unloading and ESS or
Energy Saving System.
TO
COMPRESSOR
UNLOADERS
SUPPLY
CONTROL
DELIVERY
FROM
SUPPLY
RESERVOIR
GOVERNOR
(110 CUTIN 130
CUTOUT)
TO AIR
DRYER
SYNCHRO
VALVE
FROM
SUPPLY
RESERVOIR
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