BENDIX AD-1 Dados de serviço - Página 16

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SYMPTOM

4. Constant exhaust of

air at the air dryer

purge valve exhaust

or unable to build the

system pressure.

5. The air dryer does

not purge or exhaust

air.

6. Desiccant material

being expelled from

the air dryer purge

valve exhaust (may

look like whitish liquid

or paste or small

beads).

Unsatisfactory

desiccant life.

7. Unable to remove

the end cover, or

unable to install new

desiccant cartridge.

8. Air dryer end cover

separates from the

air dryer housing

during operation.

BENDIX

AD-2

AIR DRYER TROUBLESHOOTING

CAUSE

A. Air dryer purge valve leaking excessively.

B. Defective governor.

C. Purge control line connected to reservoir

or exhaust port of governor.

D. Purge valve frozen open - faulty heater

and thermostat, wiring or blown fuse.

E. Inlet and outlet air connections are

reversed.

F. Check valve between the air dryer and

the ﬁ rst reservoir is defective.

G. Kinked or blocked (plugged) discharge

line.

H. Excessive bends in the discharge line

(water collects and freezes).

Excessive system leakage.

A. Broken, kinked, frozen, plugged or

disconnected purge control line.

B. Faulty air dryer purge valve.

C. See Causes B,E,F,G,H, for Symptom #4.

A. This symptom is almost always

accompanied by one or more of

Symptoms #1,2,3,4 and 5. See related

causes for these Symptoms above.

B. Air dryer not securely mounted.

(Excessive vibration).

C. Defective cloth covered perforated plate

in the air dryer desiccant cartridge or

improperly rebuilt desiccant cartridge.

D. Compressor is passing excessive oil.

E. Faulty heater and thermostat, wiring or

fuse not allowing purge. (Cold weather

operation only.)

A. Result of reversing the inlet and outlet

connections. (See Symptom #4, Cause

E.)

A. Excessive system pressure build-up

within air dryer; caused by either plugged

desiccant, check valve failure, frozen

or obstructed discharge line (between

air dryer and ﬁ rst reservoir) or governor

failure in conjunction with safety valve

failure.

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REMEDY

A. With the compressor loaded, apply a soap solution on

the purge valve exhaust, to test for excessive

B. Check the governor for proper "cut-in", "cut-out"

pressure and excessive leakage in both positions.

Repair or replace as necessary.

C. The purge control line must be connected to the

unloader port of governor.

D. Test heater and thermostat as described in Step 7 of

the Preventive Maintenance Section.

E. Compressor discharge to inlet port. Reconnect the

lines properly.

F. Test the check valve for proper operation (see

Symptom #3, Remedy B).

G. Check to determine if air passes through the

discharge line. Check for kinks, bends or excessive

carbon deposits.

H. Discharge line should be constantly sloping from

compressor to air dryer with as few bends as possible.

See Symptom #1's Causes and Remedies.

A. Test to determine if air ﬂ ows through purge control line

when the compressor is unloaded. Check for undrilled

ﬁ ttings. (See Symptom #4, Remedy C.)

B. After determining that the air reaches purge valve

(Remedy A above), repair the purge valve.

C. Refer to Remedies B, E, F, G, H, for Symptom #4.

A. See Causes and Remedies for Symptoms #1,2,3,4

and 5.

B. Vibration should be held to a minimum. Add bracket

supports or change the air dryer mounting location if

necessary.

C. Replace or rebuild the desiccant cartridge. NOTE:

If rebuilding the cartridge, carefully follow the

instructions packed with cartridge rebuild kit.

D. Check for proper compressor installation; if symptoms

persist, replace the compressor.

E. Refer to Remedy D under Symptom #4.

A. Refer to Symptom #4, Cause E.

A. Because it is difﬁ cult to determine the extent of the

internal damage to the air dryer, it is recommended

that the air dryer be replaced. NOTE: This type of

failure can be prevented by checking the dryer for

proper operation every three (3) months.