BENDIX AD-IS - Manual - Page 13

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Also for BENDIX AD-IS -: Brochure (2 pages), Service Data (15 pages)

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SYMPTOM

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.)

TROUBLESHOOTING CHART (Continued)

CAUSE

A. Defective AD-IS

and reservoir system

delivery check valve.

B. Safety valve setting too

low (<150 p.s.i.)

C. System pressure too

high (>135 p.s.i.)

D. Excessive pressure

pulsations from

compressor. (Typical

single cylinder type).

A. Air dryer purge valve

leaking excessively.

B. Purge valve frozen open

- faulty heater and

thermostat, wiring,

blown fuse.

C. Defective AD-IS

dryer delivery check

valve.

D. Leaking Turbo Cut-Off

valve.

E. Defective governor.

F. Leaking purge valve

control piston quad-ring.

air dryer

A. Test to determine if air is passing through check

valve. Repair or replace. Refer to Symptom 1,

Remedy B.

B. Replace safety valve.

C. Test with accurate gauge. Replace governor if

necessary.

D. Increase volume in discharge line. This can be

accomplished by adding a 90 cubic inch (or larger)

reservoir between the compressor and the AD-IS

air dryer and reservoir system.

A. With compressor loaded, apply soap solution

on purge valve exhaust, to test for excessive

leakage. Repair or replace purge valve as

necessary. Refer to Technical Bulletin

TCH-008-040.

B. Refer to paragraph 5 of Operation and Leakage

Tests for heater and thermostat test.

air

C. Refer to Symptom 1, Remedy B.

D. Repair or replace purge valve assembly.

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

position for (i) proper pressures and (ii) excessive

leakage at fittings and exhaust.

F. Repair or replace purge valve assembly.

REMEDY