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AD-IS

AIR DRYER AND RESERVOIR SYSTEM TROUBLESHOOTING CHART

SYMPTOM

1. Dryer is constantly

"cycling" or purging.

CAUSE

A. Excessive system

leakage.

B. Defective delivery check

valve.

C. Defective governor.

D. Compressor unloader

mechanism leaking

excessively.

REMEDY

A. Test for excessive system leakage.

Allowable leakage observed at dash gauge:

Single vehicle - 1 psi/minute.

Tractor trailer - 3 psi/minute.

Using soap solution, test vehicle for leakage at

fittings, drain valves and system valves. Repair

or replace as necessary.

B. Build system pressure to governor cut-out. Wait

1 minute for completion of purge cycle. Using

soap solution at exhaust of purge valve, leakage

should not exceed a 1" bubble in less than 5

seconds.

If a rapid loss of pressure is found, the following

procedure will determine if the delivery check

valve is malfunctioning:

Build system pressure to governor cut-out and allow

a full minute for the normal dryer purge cycle to

empty the purge reservoir. Switch off the engine

and "fan" the brakes so that the system pressure

reaches governor cut-in. The purge valve will return

to its closed position. The purge reservoir has a

drain valve which is opened by moving the center

lever away from its closed position. Open the drain

valve and wait 10 seconds to allow any residual

purge pressure to be released. Release the lever,

closing the drain valve. Carefully remove the air

dryer cartridge using a strap wrench and then test

for air leaking through the center of the threaded

boss by applying a soap solution to the boss.

Replace the delivery check valve if there is

excessive leakage (exceeding a 1" bubble in 5

seconds).

Regrease the seal on the air dryer cartridge before

reinstalling. Be sure the drain valve on the purge

reservoir is not leaking before restoring vehicle to

service.

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

position for (i) proper pressures and (ii)

excessive leakage at fittings and exhaust.

D. Remove air strainer or fitting from compressor

inlet cavity. With compressor unloaded, check

for unloader piston leakage. Slight leakage is

permissible.