Bendix Commercial Vehicle Systems AD-IS EVERFLOW - Manual (Page 7)

7
OPERATION & LEAKAGE TESTS
(For additional information order "Air Leakage Video"
BW2327 — available on www.bendix.com)
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-IS ® air dryer purges with an audible
escape of air. Watch the system pressure for leakage for
a ten minute period. If pressure drop exceeds, for a single
vehicle — 1 psi/minute from either service reservoir; or for
tractor trailer — 3 psi/minute from either service reservoir,
inspect the vehicle air systems for sources of leakage
and repair them.
3. CAUTION: Be sure to wear safety glasses in case of
a purge blast. Check for excessive leakage around the
purge valve of the dryer, not in the purge cycle, with
the compressor in the loaded mode (compressing air).
Apply a soap solution to the purge valve exhaust port
and observe that leakage does not exceed a 1” bubble
in one (1) second. If the leakage exceeds the maximum
specified, refer to section entitled Troubleshooting,
Symptom 4.
4. Build up system pressure to governor cut-out and note
that one of the AD-IS EverFlow assembly dryers purges
with an audible burst of air, followed immediately by
approximately 30 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 the AD-IS EverFlow assembly other
air dryer purge. If system does not follow this pattern,
refer to section entitled Troubleshooting, Symptoms 1,
2 and 3. Check the operation of the end cover heater
and thermostat assembly during cold weather operation
as follows:
A. Electric Power to the Dryer
Note: The Bendix
EverFlow assembly should be
wired through the ignition and not the battery. 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. The EverFlow assembly requires the correct
electrical voltage to operate properly.
More frequent intervals may be required depending
on a vehicle’s age, its compressor condition, use of a
non-Bendix compressor, the operating environment, the
vehicle’s vocation, and its usage. In conjunction with these
guidelines, fleets can determine the functionality of their
filters by checking for moisture in the air brake system
monthly. If moisture is present, the air dryer cartridge may
require replacement. Reference the Bendix Service Data
Sheet of the specific air dryer for additional information.
(Recommended intervals for trucks equipped with non-
Bendix compressors are 6 months (50,000 miles), one
year (100,000 miles) and two years (200,000 miles),
respectively.)
Notes:
1. Replace both desiccant cartridges at one time. Failure
to change both could cause one dryer to pass wet air
and the other dryer to pass dry air. This would lead to
a wet brake system.
2. A small amount of oil in the system is normal and should
not be considered as a reason to replace the desiccant
cartridges. Oil at the dryer purge exhaust is normal.
3. Visually check for physical damage such as chaffed or
broken air and electrical lines and broken or missing
parts.
4. Check the Bendix ® AD-IS ® EverFlow ® assembly and
purge reservoir bolts for tightness. See Figure 1.
Torque the three air dryer bolts to 360–420 in-lbs and
the four purge reservoir bolts to 300–360 in-lbs.
5. Perform the Operation & Leakage Tests listed in this
publication.
6. The assembly will not operate without electrical power.
Ensure electrical power is at the assembly during
vehicle operation.
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, and reduces the effectiveness of the device to
dry air. Use of these or other substances can damage the
air dryer and will void the warranty.