BENDIX M-21-M-22 ANTILOCK MOD ASSY Servisní příručka stáhnout pdf (Strana 27)

Air Brake System

Revised 11/15/99

Troubleshooting Guide

Air Dryer (cont’d)

AIR DRYER TESTING

1. Set the vehicle parking brake.

2. Drain all air reservoirs. Refer to “Draining Air Reservoirs.”

3. Start the engine and charge the air system to the governor cutout point.

4. Verify that an exhaust of air occurs at the air dryer exhaust port. This is the air

dryer purge cycle.

• If the air dryer does not cycle properly, check for air leaks at the air line connec-

tions and in the air brake system. If necessary, repair or replace the air dryer.

Refer to the Medium Duty Truck Unit Repair Manual.

Condition

Air Dryer Does Not Purge

Or Exhaust Air

Dessicant Material

(Whitish Liquid Or Paste Or

Small Beads) Being Expelled

From Air Dryer Purge Valve

Exhaust

Possible Cause

Broken, kinked, frozen,

plugged or disconnect

purge control line.

Faulty air dryer purge valve.

Air dryer not securely

mounted, allowing

excessive vibration.

Failed dessicant cartridge.

Compressor piston rings

leaking.

Faulty heater and

thermostat, wiring, fuse,

not allowing purge. (Cold

weather operation only.

Remedy/Recommendation

Test to determine air flows

through purge control line

when compressor is

unloaded.

Repair or replace air dryer.

Refer to the Medium Duty

Truck Unit Repair Manual

Check and tighten mounting

hardware.

Replace dessicant cartridge.

Check for oil in the air supply.

If oil is present, repair or

replace compressor. Refer to

the Medium Duty Truck Unit

Repair Manual.

Test electrical circuit.

Replace parts as necessary.

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