operators_manual

enter the brake system. It provides clean,
dry air to the components of the brake
system, which increases the life of the
system and reduces maintenance costs.
NOTE
Because no two vehicles operate under
identical conditions, maintenance and main-
tenance intervals will vary. Experience is a
valuable guide in determining the best main-
tenance interval for any one particular oper-
ation.
NOTE
A small amount of oil in the system may be
normal and should not, in itself, be consid-
ered a reason to replace the desiccant car-
tridge. Oil stained desiccant can function ad-
equately.
Every 900 operating hours or 25,000 miles
(40,200 km) or every three (3) months
check for moisture in the air brake system
by opening air tanks, drain cocks, or valves
and checking for presence of water.
A tablespoon of water found in the air tank
would point to the need for a desiccant
cartridge change. However, the following
conditions can also cause water
accumulation and should be considered
before replacing the desiccant cartridge.
• Air usage is exceptionally high and
not normal for a highway vehicle.
This may be due to accessory air
demands or some unusual air
requirement that does not allow the
compressor to load and unload
(compressing and non-compressing
cycle) in a normal fashion or it may
be due to excessive leaks in the air
system.
• In areas where more than a 30°F
(17°C) range of temperature occurs
in one day, small amounts of water
can accumulate in the air brake
system due to condensation. Under
these conditions, the presence of
small amounts of moisture is normal
and should not be considered as an
indication that the dryer is not
performing properly.
• An outside air source has been
used to charge the air system. This
air did not pass through the drying
bed.
Overhaul
Maintenance intervals typical for on-
highway operation would be 2 - 3 years,
350,000 miles or 10,800 hours.
Maintenance intervals typical for high duty
cycle usage such as transit bus, refuse
hauler, dump truck, cement mixers and off-
highway operation would be 1 year,
100,000 miles or 3,600 hours.
NOTE
Review the warranty policy before perform-
ing any maintenance procedures. An ex-
tended warranty may be voided if unauthor-
ized maintenance is performed during this
period.
Bendix
®
AD-IS Series Air Dryer
Your vehicle may be equipped with a
Bendix
®
AD-IS series air dryer. Any air
MAINTENANCE - What is an Air Dryer?
Y53-6096-1A1 (01/17) 157
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