Bendix Commercial Vehicle Systems TU-FLO 1000 AIR COMPRESSOR - Manual (Page 3)

3
had either die cast aluminum, cast ductile iron, or forged
steel rods which were not rifle drilled but were drilled at the
top of the rod. The wrist pins and bushings are lubricated
by oil dripping from a drip-boss on the piston into a
“catch-funnel” at the top of the rod and through the drilled
passage to the bushings and pins. (SEE FIG. 7)
A nameplate is attached to the crankcase of all compressors.
It shows the piece number, type and serial number (Fig. 8).
A nameplate with a black background denotes a new
compressor, whereas a nameplate with a red background
designates that the compressor is a factory reconditioned
unit. All compressors are identified by the piece number
which is the number to use when reference is made to a
particular compressor. The type and serial number is
supplementary information.
OPERATION
GENERAL
All compressors run continuously while the engine is running,
but actual compression of air is controlled by a governor,
which stops or starts the compression of air by loading or
unloading the compressor in conjunction with its unloading
mechanism. This is done when the air pressure in the system
reaches the desired maximum or minimum pressures.
INTAKE AND COMPRESSION (Loaded)
During the down stroke of the piston, a slight vacuum created
above the piston causes the inlet valve to move off its seat.
Atmospheric air is drawn in through the compressor intake,
by the open inlet valve, and on top of the piston (Fig. 9). As
the piston starts its upward stroke, the air that was drawn in
on the down stroke is being compressed. Now, air pressure
on top of the inlet valve plus the force of its spring, returns
the inlet valve to its seat. The piston continues the upward
stroke and compresses the air sufficiently to overcome the
discharge valve spring and unseat the discharge valve. The
compressed air then flows by the open discharge valve, into
the discharge line and on to the reservoirs (Fig. 10).
FIGURE 5
ENGINE LUBRICATED TYPE FIGURE 6
SELF-LUBRICATED TYPE
FIGURE 9
FIGURE 10
DISCHARGE
VALVE
PISTON
STROKE
TO GOVERNOR
INTAKE
STRAINER
UNLOADER PLUNGER
INLET VALVE
TO RESERVOIR
INTAKE
DISCHARGE
VALVE
PISTON
STROKE
TO GOVERNOR
INTAKE
STRAINER
UNLOADER PLUNGER
INLET VALVE
TO RESERVOIR
COMPRESSION
FIGURE 8 - COMPRESSOR NAMEPLATE
FIGURE 7- PISTONS & CONNECTING RODS
NEW DESIGN
WRIST PIN
BUSHING
“CATCH FUNNEL”
DIE CAST
PISTON
DIE CAST
CONNECTING ROD
OLD DESIGN
OIL
PASSAGE
WRIST PIN
WRIST PIN
BUSHING
PISTON WRIST PIN
LOCK WIRE
CAST IRON
PISTON
STEEL
CONNECTING
ROD