BENDIX TU-FLO 750 COMPRESSOR Servicegegevens - Pagina 4

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Discharge

Optional "Ping" Tank

Line

Compressor

FIGURE 6A - SYSTEM DRAWING

DUTY CYCLE

The duty cycle is the ratio of time the compressor spends

building air to the total engine running time. Air compres-

sors are designed to build air (run "loaded") up to 25% of

the time. Higher duty cycles cause conditions that affect

air brake charging system performance which may require

additional maintenance. Factors that add to the duty cycle

are: air suspension, additional air accessories, use of an

undersized compressor, frequent stops, excessive leakage

from ﬁ ttings, connections, lines, chambers or valves, etc.

Refer to Table A in the Troubleshooting section for a guide

to various duty cycles and the consideration that must be

given to maintenance of other components.

COMPRESSOR INSTALLATION

While the original compressor installation is usually com-

pleted by the vehicle manufacturer, conditions of operation

and maintenance may require additional consideration. The

following presents base guidelines.

DISCHARGE LINE

The discharge line allows the air, water-vapor and oil-vapor

mixture to cool between the compressor and air dryer or

reservoir. The typical size of a vehicle's discharge line,

(see column 2 of Table A in the Troubleshooting section)

assumes a compressor with a normal (less than 25%) duty

cycle, operating in a temperate climate. See Bendix and/or

other air dryer manufacturer guidelines as needed.

Air Dryer

Governor

(Governor plus Synchro valve

™

for the Bendix

DuraFlo

596

Compressor)

The Air Brake Charging System

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.

Optional Bendix

Oil Coalescing Filter

Service Reservoir

(Supply Reservoir)

The discharge line must maintain a constant slope down

from the compressor to the air dryer inlet ﬁ tting or reservoir

to avoid low points where ice may form and block the ﬂ ow.

If, instead, ice blockages occur at the air dryer or reservoir

inlet, insulation may be added here, or if the inlet ﬁ tting is

a typical 90 degree ﬁ tting, it may be changed to a straight

or 45 degree ﬁ tting. Shorter discharge line lengths or

insulation may be required in cold climates.

While not all compressors and charging systems are

equipped with a discharge line safety valve this compo-

nent is recommended. The discharge line safety valve is

installed in the cylinder head (Tu-Flo

the compressor discharge port and protects against over

pressurizing the compressor in the event of a discharge

line freezeup.

THREAD

FIGURE 6B - DISCHARGE LINE SAFETY VALVE

supplies the

PuraGuard

™

Reservoir Drain

550/750) or close to

HOLE