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AIR CLEANERS
Operation
Air required by the diesel engine passes through the
air cleaner assemblies mounted on each side of the
radiator. These air cleaners discharge heavy particles
of dust and dirt by centrifugal action and then remove
finer particles by passing air through filter cartridges.
The engine demand for air creates a vacuum in the air
cleaners and causes outside air to be drawn in through
air inlets on the air cleaners. Dirty air entering here is
drawn through a series of tubes that are designed to
produce a cyclonic action. As the air passes through
the outer portion of the tubes, a circular motion is set
up causing dust and dirt particles to be thrown from
the air stream into dust collectors (1, Figure 5-1). At the
same time, the air stream turns and is directed up
through the center of the tubes into the filter chamber.
Here the air passes through the main filter element and
safety filter element and out the clean air outlet to the
engine's air intake system. The function of the safety
filter is to increase overall reliability and engine protec-
tion.
FIGURE 5-1. ENGINE AIR CLEANERS
1. Dust Collectors
2. Precleaner Section
C05013 5/98
AIR FILTRATION SYSTEM
3. Air Intake Cover
4. Element Cover
Air Filtration System
The truck engine must be shut down before serv-
icing the air cleaner assemblies or opening the
engine air intake system.
Never start the engine with the filter elements re-
moved. Engine operation with elements removed
can cause serious engine damage.
General Service Information
• Inspect and empty dust collector cups at regular
intervals; daily inspection is recommended. Never
allow the dust level to build up to the tube (pre-
cleaner) chamber.
• During operation or after the engine has been shut
down, observe the air cleaner vacuum gauges
mounted on the overhead display panel in the
operator's cab. Filter service is required when a
gauge shows maximum restriction.
• Check all engine air inlet tubes, hoses and clamps.
All connections must be air tight to prevent dirt
entry.
• Air cleaner housing fasteners and mountings must
be tight.
• After filter service has been accomplished, reset
air cleaner service vacuum gauges by pressing the
reset button on the face of the gauge.
C5-1
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Troubleshooting
