Bendix Commercial Vehicle Systems DURAFLO 596 COMPRESSOR 10/04 - Manual (Page 5)

5
FIGURE 8A - SYSTEM DRAWING
Air Dryer
Reservoir Drain
Service Reservoir
(Supply Reservoir)
Compressor
Governor
(Governor plus Synchro valve
for the Bendix ® DuraFlo ™ 596
Compressor)
Discharge
Line Optional “Ping” Tank
Optional Bendix ® PuraGuard ® QC ™
Oil Coalescing Filter
The Air Brake Charging System supplies the
compressed air for the braking system as well as other air
accessories for the vehicle. The system usually consists
of an air compressor, governor, discharge line, air dryer,
and service reservoir.
FIGURE 8B - DISCHARGE LINE SAFETY VALVE
HOLE
THREAD
DISCHARGE LINE TEMPERATURE
When the temperature of the compressed air that enters
the air dryer is within the normal range, the air dryer can
remove most of the charging system oil. If the temperature
of the compressed air is above the normal range, oil as oil-
vapor is able to pass through the air dryer and into the air
system. Larger diameter discharge lines and/or longer dis-
charge line lengths can help reduce the temperature.
The air dryer contains a filter that collects oil droplets, and a
desiccant bed that removes almost all of the remaining wa-
ter vapor. The compressed air is then passed to the air brake
service (supply) reservoir. The oil droplets and the water
collected are automatically purged when the governor
reaches its "cut-out" setting.
For vehicles with accessories that are sensitive to small
amounts of oil, we recommend installation of a Bendix
®
PuraGuard ® QC ™ oil coalescing filter, designed to minimize
the amount of oil present.
LUBRICATION
The vehicle's engine provides a continuous supply of oil to
the compressor. Oil is routed from the engine to the com-
pressor oil inlet. An oil passage in the crankshaft conducts
pressurized oil to precision sleeve main bearings and to the
connecting rod bearings. Spray lubrication of the cylinder
bores, connecting rod wrist pin bushings, and ball type main
bearings is obtained as oil is forced out around the crank-
shaft journals by engine oil pressure. Oil then falls to the
bottom of the compressor crankcase and is returned to the
engine through drain holes in the compressor mounting
flange.
COOLING
Air flowing through the engine compartment from the action
of the engine fan and the movement of the vehicle assists in
cooling the compressor. Cooling fins are part of the crank-
case/cylinder block casting. Coolant flowing from the engine
cooling system through connecting lines enters the head
and passes through internal passages in the cylinder head
and is returned to the engine. Proper cooling is important in
maintaining discharge air temperatures below the maximum
recommended 400 degrees Fahrenheit. Figure 9 illustrates
the various approved coolant flow connections. See the tabu-
lated technical data in the back of this manual for specific
requirements.