Air Dryer Maintenance
Vehicles equiped with a PACCAR
Transmission will have an air dryer fitted
with an oil-coalescing desiccant cartride.
This air dryer cartridge must be replaced
every 1 year regardless of mileage.
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.
Proper Transmission
Lubrication
Proper lubrication procedures are key to a
good all-around maintenance program. If
the lubricant is not doing its job or if the
lubricant level is ignored, all other
maintenance procedures are not going to
keep the transmission running or assure
long transmission life.
Transmission internal parts are amply
lubricated if these procedures are closely
followed:
1. Maintain lubricant level and inspect
regularly.
2. Follow maintenance intervals, see
Transmission Lubrication Change
Intervals on page 33.
3. Use the correct grade and type of
lubricant, see PACCAR
Transmission Lube Specification on
page 37.
4. Buy lubricant from an approved
dealer.
Mixing of Oil Types
CAUTION
Do not mix engine and gear oil in the
same transmission. Mixing engine and
gear oils could cause damage to the
transmission.
Engine oils and gear oils may not be
compatible; mixing can cause breakdown
of the lubricant and affect component
performance. When switching between
types of lubricants, all areas of each
affected component must be thoroughly
flushed.
NOTE
For a list of Approved Synthetic Lubri-
cants, see vehicle operator manual.
NOTE
Additives and friction modifiers must not
be introduced.
Proper Transmission Lubrication
Level
Make sure the transmission lubricant is
level with the bottom of the fill opening.
Being able to reach the lubricant with your
finger does not mean the lubricant is at the
proper level.
MAINTENANCE - Air Dryer Maintenance
32 Y53-1272-1B1 (08/17)
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