Engine Air Cleaner Service Indicator - Inspect - Perkins 1206A-E70TTA Operation And Maintenance Manual

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Illustration 42
Typical example
1. Ensure that the outer body of the air cleaner to be
serviced is clean and free from dirt.
2. Release clips (1) and remove end cover (2) from
air cleaner body (5). If necessary, clean end cover
and ensure that the valve (7) is clean and free
from dirt. Check the valve (7) for wear or damage,
replace if necessary.
3. Remove primary air filter element (3) and, remove
the secondary air filter element (4). Discard all old
air filter elements.
4. Install new secondary air filter element (4) and
install new primary air filter element (3).
5. Install end cover (2) to air cleaner body (5) and
secure end cover clips (1). If necessary, reset the
air service indicator (6), refer to this Operation and
Maintenance Manual, Engine Air Cleaner Service
Indicator - Inspect for more information.
Engine Air Cleaner Service
Indicator - Inspect
Some engines may be equipped with a different
service indicator.

Engine Air Cleaner Service Indicator - Inspect

Some engines are equipped with a differential gauge
for inlet air pressure. The differential gauge for inlet
air pressure displays the difference in the pressure
that is measured before the air cleaner element and
the pressure that is measured after the air cleaner
element. As the air cleaner element becomes dirty,
the pressure differential rises. If your engine is
equipped with a different type of service indicator,
follow the OEM recommendations in order to service
the air cleaner service indicator.
The service indicator may be mounted on the air
cleaner element or in a remote location.
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Illustration 43
Typical service indicator
Observe the service indicator. The air cleaner
element should be cleaned or the air cleaner element
should be replaced when one of the following
conditions occur:
• The yellow diaphragm enters the red zone.
• The red piston locks in the visible position.
Test the Service Indicator
Service indicators are important instruments.
• Check for ease of resetting. The service indicator
should reset in less than three pushes.
• Check the movement of the yellow core when the
engine is accelerated to the engine rated speed.
i02335405
The yellow core should latch at the greatest
vacuum that is attained.
If the service indicator does not reset easily, or if the
yellow core does not latch at the greatest vacuum,
the service indicator should be replaced. If the new
service indicator will not reset, the hole for the service
indicator may be restricted.
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Maintenance Section
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