Mitsubishi 6M60-TL Service Manual page 311

STRUCTURE AND OPERATION
2. Air Dryer
61-6
• The air dryer protects brake compo-
nents by removing moisture and oil
from air that has been compressed by
the air compressor.
• The air dryer incorporates an air pres-
sure governor, which keeps the pres-
sure in the air tank constant by
releasing air compressed by the air
compressor to the atmosphere when
the pressure in the air tank makes
such operation necessary.
2.1 Drying action
• While the air tank is being charged, air
from the air compressor enters the air
dryer's supply side. Moisture and oil
are separated from the air inside the
body and collect in the bottom. The air
then passes through the oil filter,
which removes smaller oil droplets
and particles of dust. The air then
flows into the case, where the desic-
cant removes any remaining moisture.
• As the air flows upward in the case, it
makes contact with increasingly dry
desiccant and thus contains less and
less moisture. When the air reaches
the top of the case, it is dry. It flows
through the check valve A, purge
chamber, and check valve B, and it is
then supplied from the delivery side to
the air tank. Air pressure also acts
upon the piston in the air pressure
governor.