The function of the air compressor is to build up and
maintain the air pressure required to operate air powered
devices in air brake or air auxiliary systems.
The Tu Flo Type 400 is a two cylinder, single stage, air
cooled, reciprocating piston type compressor. The rated
capacity of all Bendix compressors is their piston
displacement in cubic feet per minute when operating at
1250 RPM. The rated capacity of the Tu Flo 400
compressor is 7-1/4 cubic feet per minute. SEE FIG. 1.
FIGURE 1 - TU FLO 400
Tu Flo type compressors have automatic type inlet
valves. Their unloading mechanisms are located in the
cylinder block and they have no external moving parts.
The compressor is engine lubricated. Oil under pressure
from the Diesel engine is forced through the oil passage
in the crankshaft and out around each connecting rod
journal. The turning motion of the crankshaft throws the
oil that is forced out at the journals, against the cylinder
bores and crankcase walls, lubricating the bores and
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. 2
FIGURE 2 - PISTONS & CONNECTING RODS
A nameplate is attached to the crankcase of the
compressor. It shows the piece number, type and serial
number (Fig. 3). A nameplate with a black background
denotes a new compressor, whereas a nameplate with a
red back-ground designates that the compressor is a
factory reconditioned unit. The compressor is 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.
FIGURE 3 - TYPICAL COMPRESSOR NAMEPLATE