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4.5
Section 4
Air Cleaner and Air Intake System
4
Heavy-Duty Air Cleaner
General
The heavy-duty air cleaner consists of a cylindrical
housing, typically mounted to a bracket, and
connected with a formed rubber hose to an adapter on
the carburetor or throttle body/intake manifold (EFI
units). The air cleaner housing contains a paper
element and inner element, designed for longer
service intervals. The system is CARB/EPA certified
and the components should not be altered or modified
in any way.
Figure 4-9. Heavy-Duty Air Cleaner.
To Service
Every 250 hours of operation (more often under
extremely dusty or dirty conditions), replace the
paper element and check the inner element. Follow
these steps.
1. Unhook the two retaining clips and remove the
end cap from the air cleaner housing.
2. Pull the air cleaner element out of the housing.
See Figure 4-10.
Figure 4-10. Removing Elements.
3. After the element is removed, check the condition
of the inner element. It should be replaced
whenever it appears dirty, typically every other
time the main element is replaced. Clean the area
around the base of the inner element before
removing it, so dirt does not get into the engine.
4. Do not wash the paper element and inner
element or use compressed air, this will damage
the elements. Replace dirty, bent or damaged
elements with new genuine Kohler elements as
required. Handle the new elements carefully; do
not use if the sealing surfaces are bent or
damaged.
5. Check all parts for wear, cracks, or damage.
Replace any damaged components.
6. Install the new inner element, followed by the
outer element. Slide each fully into place in the
air cleaner housing.
7. Reinstall the end cap so the dust ejector valve is
down, and secure with the two retaining clips.
See Figure 4-9.
Inner Element
Element