BENDIX AD-9si Service Data - Seite 9

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AIR DRYER INSPECTION

1. Visually check for physical damage, such as chafed or

broken air and electrical lines, and broken or missing

parts.

2. Check the Bendix

bolts for tightness. See Figure 1. Re-torque the three

air dryer bolts to 720–912 in-lbs.

3. Perform the Operation & Leakage Tests listed in this

publication.

4. This air dryer is intended to remove moisture and

other contaminants normally found in the air brake

system. Do not inject alcohol, anti-freeze, or other

de-icing substances into – or upstream of – the air

dryer. Alcohol is removed by the dryer, but reduces

the effectiveness of the device to dry air. Use of

these or other substances can damage the air dryer

and may void the warranty.

5. For the Bendix AD-9si air dryer, there are

no serviceable components or maintenance

requirements that require the removal of the clamp

band.

OPERATION & LEAKAGE TESTS (REFER TO

THE TROUBLESHOOTING CHART IN THIS

MANUAL)

1. Check all lines and fittings leading to and from the air

dryer for leakage and integrity. Repair any leaks found.

2. Build up system pressure to governor cut-out and note

that the Bendix AD-9si air dryer purges with an audible

escape of air. Watch the system pressure and note the

pressure fall-off for a ten minute period. If pressure

drop exceeds – a) for a single vehicle: 1 psi/minute

from either service reservoir; or b) for tractor trailer: 3

psi/minute from either service reservoir – inspect the

vehicle air systems for leak sources and repair them.

Refer to the Symptoms 1 and 4 in the Troubleshooting

Chart.

3. CAUTION: Be sure to wear safety glasses in case

of a purge blast. Check for excessive leakage around

the purge valve with the compressor in the charge mode

(compressing air). Apply a soap solution to the purge

valve exhaust port and observe that leakage does not

exceed a 1 inch bubble in one second. If any leakage

exceeds the maximum specified, refer to Symptom 4

in the Troubleshooting Chart.

AD-9si

air dryer and mounting

4. Build up system pressure to governor cut-out and note

that the AD-9si air dryer purges with an audible burst of

air, followed immediately by approximately 40 seconds

of air flowing out of the purge valve. Apply and release

the service brakes several times to reduce system

air pressure to governor cut-in. Note that the system

once again builds to full pressure and is followed by a

purge. If the system does not follow this pattern, refer

to Symptoms 5 and 6 in the Troubleshooting Chart.

5. Check the operation of the air dryer heater and

thermostat assembly during cold weather operation as

follows:

A. Electric Power to the Dryer (Refer to Figure 4)

With the ignition or engine kill switch in the RUN

position, check for voltage to the Heater and

Thermostat assembly using a voltmeter or test light.

Unplug the electrical connector at the air dryer and

place the test leads on each of the connections of

the female connector on the vehicle power lead. If

there is no voltage, look for a blown fuse, broken

wires, or corrosion in the vehicle wiring harness.

Check to see if a good ground path exists.

B. Thermostat and Heater Operation

Note: These tests are not possible except in cold

weather operation.

Turn off the ignition switch and cool the Heater

and Thermostat assembly to below 40° F. Using

an ohmmeter, check the resistance between the

electrical pins in the air dryer connector half. The

resistance should be 1.5 to 3.0 ohms for the 12 volt

heater assembly, and 6.0 to 9.0 ohms for the 24 volt

heater assembly.

Warm the Heater and Thermostat assembly to

approximately 90° F and again check the resistance.

The resistance should exceed 1000 ohms. If the

resistance values obtained are within the stated

limits, the thermostat and heater assembly is

operating properly. If the resistance values obtained

are outside the stated limits, replace the heater and

thermostat assembly.

GENERAL

When rebuilding or replacing components of the air dryer

and reservoir, use only genuine Bendix

parts. For ease in servicing, the AD-9si air dryer has

been designed so that maintenance kits can be installed

without removing the air dryer from the vehicle. CAUTION:

Always depressurize the air dryer and purge volume by

slowly removing the plug in port 22 – and drain all other

reservoirs on the vehicle – to 0 psi before servicing

the air dryer.

brand replacement