User Manual

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.
Maintenance
CAUTION
Replace oil-coalescing desiccant air
dryer
cartridge every 1 year regardless
of mileage. Only use oil-coalescing
desiccant replacement cartridge when
replacing. Failure to perform this main-
tenance task will void the PACCAR
Transmission warranty and may result
in expensive transmission damage.
Replace (non-oil-coalescing) desiccant
cartridge:
•
On-highway operation replace
every 2-3 years, 350,000 miles
(560,000 km) or 10,800 hours.
• High duty cycle usage such as
transit bus, refuse hauler, dump
truck, cement mixers and off-
highway operation replace every 1
year, 100,000 miles (160,000 km)
or 3,600 hours.
NOTE
Review the warranty policy before per-
forming
any maintenance procedures.
An extended warranty may be voided
if unauthorized maintenance is per-
formed during this period.
Bendix® AD-HF Series Air Dryer
Y
our vehicle may be equipped with a
Bendix® AD-HF series air dryer. Any air
dryer replacement should be made with an
identical component.
MAINTENANCE - Air Dryer Maintenance
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