BENDIX AD-9si Dados de serviço - Página 14

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SYMPTOM

2. Water in vehicle reservoirs.

3. Safety valve on air dryer

"popping off" or exhausting

air.

4. Constant exhaust of air at air

dryer purge valve exhaust

or unable to build system

pressure. (Charge mode.)

BENDIX

AD-9si

TROUBLESHOOTING CHART

CAUSE

A. Maximum air dryer inlet temperature

is exceeded due to improper discharge

line length.

B. Ambient temperature exceeds 125°F.

C. Air system charged from outside air

source (outside air not passing through

air dryer).

D. Excessive air usage - Air dryer not

compatible with vehicle air system

requirement (improper air dryer/vehicle

application).

E. Desiccant requires replacement.

F. Air dryer not purging.

G. Purge (air exhaust) time insufficient due

to excessive system leakage.

A. Safety valve setting too low (<150 psi).

B. System pressure too high (>135 psi).

C. Excessive pressure pulsations from

compressor. (Typical single cylinder

type).

A. Air dryer purge valve leaking excessively. A. With the compressor loaded, apply a soap solution on the purge

B. Purge valve frozen open - faulty heater

and thermostat, wiring, blown fuse.

C. Defective AD-9si air dryer delivery

check valve.

D. Leaking turbo cut-off valve.

E. Defective governor.

F. Leaking purge valve control piston

seals.

AIR DRYER

A. Check for excessive carbon build-up in the compressor

discharge line. Replace if required. Make certain that the

discharge line length is at least 6 ft. Increase the discharge line

length and/or diameter to reduce air dryer inlet temperature.

B. Relocate the air dryer away from excessive heat source.

C. If the system must have outside air fill provision, outside air

should pass through the air dryer.

D. Refer to the Bendix

Air Dryer Application Guideline (BW2600)

for proper application of the Bendix

extended purge reservoir may be added for higher air usage

vehicles, such as city buses and construction vehicles.

If the vehicle is equipped with high air usage accessories such

as trailer pump-off systems or central tire inflation, the air for

these accessories must by-pass the air dryer.

E. Replace desiccant cartridge assembly. See Recommended

Service Intervals for Bendix Air Dryers (BW8068) for

recommended service intervals.

F. Refer to Symptom 6.

G. Refer to Symptom 1.

A. Replace safety valve.

B. Test with accurate gauge. Replace the governor cartridge if

necessary.

C. Increase the volume in the discharge line. This can be

accomplished by adding a 90 cubic inch (or larger) reservoir

between the compressor and the AD-9si air dryer.

valve exhaust, to test for excessive leakage. Repair or replace

the purge valve as necessary.

B. Refer to paragraph 5 of the Operation and Leakage Tests for the

heater and thermostat test.

C. Refer to Symptom 1, Remedy B.

D. Repair or replace the purge valve assembly.

E. Check the governor at both "cut-in" and "cut-out" positions for

proper pressures and excessive leakage at the exhaust.

F. Repair or replace the purge valve assembly.

REMEDY

AD-9si

air dryer. An