51
375 John Deere Standard and Aftercooled/Filtered Operator’s Manual and Parts List
DESCRIPTION
AFTERCOOLED AND FILTERED 2.12
AIR SYSTEM, FUNCTIONAL
DESCRIPTION
Refer to Figure 2-3. The purpose of the aftercooled system
is to operate the air compressor in conditions when
compressed air temperature is required to be within 20° to
25°F (13° to 17°C) of the ambient temperature.
A selector valve is provided on all aftercooled
compressors. Choosing the aftercooled air completely
forces the airow from the receiver tank to the aftercooler.
The ambient air which is drawn through the aftercooler by
the engine fan, cools the compressed air as it passes
through the aftercooler core. Cooled air enters the
moisture separator where condensation is removed from
the cooler air and discharged. This condensate does
carry some oil and it should be disposed of properly
in accordance with local regulations.
From the moisture separator the air enters the (optional)
rst stage lter. Particles and additional water are removed
from the rst stage lter. The condensate should be
drained and stored in a suitable container. From the
rst stage lter, the air enters the (optional) second stage
lter. This lter removes smaller particles and any
additional water. The condensate should be drained
and stored in a suitable container. Upon compressor
shutdown, the lters will drain to clear the condensate from
the system. This will prevent freezing in cold conditions.
NOTE
The aftercooler system should
not be operated when the ambient
temperature is below 32°F (0°C). To
operate in the non-aftercooled mode
close the aftercooler selector valve
completely.
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