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1. Troubleshooting Chart

BENDIX

SYMPTOM

1. Dryer is constantly cycling

or purging.

AD-IS

AIR DRYER & RESERVOIR SYSTEM

TROUBLESHOOTING CHART

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 the dash gauge:

- Single vehicle - 1 psi/minute.

- Tractor/trailer - 3 psi/minute.

Using a soap solution, test the vehicle for leakage at the

fittings, drain valves and system valves and any accessories

(i.e. air suspension) connected to the Bendix

auxiliary ports. If an accessory is suspected to be the cause

of leakage, disconnect that accessory from the air dryer, plug

the auxiliary port that it was in, and retest the AD-IS air dryer

for proper purge cycling. Repair or replace as necessary.

B. Build system pressure to governor cut-out. Wait one (1)

minute for the completion of the purge cycle. Using a soap

solution at the exhaust of the purge valve, leakage should

not exceed a one inch bubble in less than five (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 apply and release 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 area.

Replace the delivery check valve if there is excessive leakage

(exceeding a one inch bubble in five (5) seconds).

Grease the seal on the air dryer cartridge before reinstalling.

Be sure the drain valve on the purge reservoir is not leaking

before restoring the vehicle to service.

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

for (i) proper pressures and (ii) excessive leakage at fittings

and exhaust.

D. Remove the air strainer, or fitting, from compressor inlet cavity.

With the compressor unloaded, check for unloader piston

leakage. Slight leakage is permissible.

AD-IS

air dryer