BENDIX TU-FLO 750 COMPRESSOR Service Data - Page 2

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AIR DISCHARGE

WATER

FIGURE 1 - CYLINDER HEAD

CAT MACK

(MACK STYLE)

FIGURE 2 - MOUNTING CONFIGURATIONS

Various mounting and drive conﬁ gurations, as shown in

Figure 2, are supplied as required by the vehicle engine

designs. A nameplate identifying the compressor piece

number 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

operating 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

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 ﬂ ows 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 air in the discharge

DETROIT

CUMMINS

WATER

DIESEL