5
DISCHARGE LINE TEMPERATURE
When the temperature of the compressed air that enters
the air dryer is within the normal range, the air dryer can
remove most of the charging system oil. If the temperature
of the compressed air is above the normal range, oil as oil-
vapor is able to pass through the air dryer and into the air
system. Larger diameter discharge lines and/or longer
discharge line lengths can help reduce the temperature.
The air dryer contains a filter that collects oil droplets, and a
desiccant bed that removes almost all of the remaining water
vapor. The compressed air is then passed to the air brake
service (supply) reservoir. The oil droplets and the water
collected are automatically purged when the governor
reaches its "cut-out" setting.
For vehicles with accessories that are sensitive to small
amounts of oil, we recommend installation of a Bendix
®
PuraGuard
®
QC
™
oil coalescing filter, designed to minimize
the amount of oil present.
AIR CLEANER MAINTENANCE
POLYURETHANE SPONGE STRAINER (FIG. 9)
Remove and wash all of the parts. The strainer element
should be cleaned or replaced. If the element is cleaned, it
should be washed in a commercial solvent or a detergent
and water solution. The element should be saturated in clean
engine oil then squeezed dry before replacing it in the strainer.
Be sure to replace the air strainer gasket if the entire air
strainer is removed from the compressor intake.
DRY ELEMENT - PLEATED PAPER AIR STRAINER
(FIG. 10)
Remove the spring clips from either side of mounting baffle
and remove the cover. Replace the pleated paper filter and
remount the cleaned cover making sure the filter is in
position. Be sure to replace the air strainer gasket if the
entire air strainer is removed from the compressor intake.
NOTE: Some compressors are fitted with compressor intake
adapters (Fig. 11) which allow the compressor intake to be
connected to the engine air cleaner.
In this case, the compressor receives a supply of clean air
from the engine air cleaner. When the engine air filter is
changed, the compressor intake adapter should be checked.
If it is loose, remove the intake adapter, clean the strainer
plate, if applicable, and replace the intake adapter gasket,
and reinstall the adapter securely. Check line connections
both at the compressor intake adapter and at the engine air
cleaner. Inspect the connecting line for ruptures and replace
it if necessary.
FIGURE 9 - SPONGE TYPE STRAINER
FIGURE 10 - DRY ELEMENT STRAINER
FIGURE 8B - DISCHARGE LINE SAFETY VALVE
HOLE
THREAD
