Intake And Compression Of Air (Loaded); Operation; Cylinder Head; Mounting Configurations - BENDIX TU-FLO 750 COMPRESSOR Manual

AIR DISCHARGE
WATER
FIGURE 1 - CYLINDER HEAD
CAT MACK
(MACK STYLE)
FIGURE 2 - MOUNTING CONFIGURATIONS
Various mounting and drive configurations, as shown in
Figure 2, are supplied as required by the vehicle engine
designs. A nameplate identifying the compressor piece num-
ber and serial number is attached to the side of the
crankcase. (Reference Figure 3.)
FIGURE 3 - NAMEPLATE

OPERATION

The compressor is driven by the vehicle engine and is oper-
ating continuously while the engine is running. Actual
compression of air is controlled by the compressor unload-
ing mechanism and the governor. The governor, which is
generally mounted on the compressor, maintains the brake
2
UNLOADER COVER
MACK
EXTENDED
TU-FLO 750 COMPRESSOR
BENDIX NO.
SERIAL NO.
MANUFACTURED BY BENDIX
PLATE
AIR
DISCHARGE
WATER
AIR INLET
GOVERNOR
MOUNTING
PAD
MACK
"FOXHEAD"
system air pressure to a preset maximum and minimum
pressure level.

INTAKE AND COMPRESSION OF AIR (LOADED)

During the down stroke of the piston, a slight vacuum is
created between the top of the piston and the cylinder head,
causing the inlet valve to move off its seat and open. (Note:
The discharge valve remains on its seat.) Atmospheric air is
drawn through the air strainer and the open inlet valve into
the cylinder (see Figure 4). As the piston begins its upward
stroke, the air that was drawn into the cylinder on the down
stroke is being compressed. Air pressure on the inlet valve
plus the force of the inlet spring, returns the inlet valve to its
seat and closes. The piston continues the upward stroke
and compressed air pushes the discharge valve off its seat
and air flows by the open discharge valve, into the discharge
line and to the reservoirs (see Figure 5). As the piston reaches
the top of its stroke and starts down, the discharge valve
spring and air pressure in the discharge line returns the
discharge valve to its seat. This prevents the compressed
DETROIT
CUMMINS
WATER
DIESEL