operators_manual

NOTE
Because no two vehicles operate un-
der identical conditions, maintenance
and maintenance intervals will vary.
Experience is a valuable guide in de-
termining the best maintenance inter-
val for any one particular operation.
NOTE
A small amount of oil in the system
may be normal and should not, in it-
self, be considered a reason to replace
the desiccant cartridge. Oil stained
desiccant can function adequately.
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.
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 be 2 - 3 years, 350,000 miles
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 or 3,600 hours.
MAINTENANCE - Air Dryer Maintenance
210 Y53-6047-2HEN (03/18)
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