Engine Air Cleaner Service Indicator - Inspect - Perkins 904J-E36TA Operation And Maintenance Manual

M0092609-05
2. Inspect the top cover (1) and if necessary remove
top cover to clean cover. Ensure that dirt cannot
enter the air cleaner system with top cover
removed. If necessary, clean top cover and install.
3. Remove end cover (4) from air cleaner body (2). If
necessary, clean end cover and ensure that the
vacuum valve (5) is clean and free from dirt.
Check the vacuum valve (5) for wear or damage,
replace if necessary.
4. Remove primary air filter element (3) and if
equipped, remove the secondary air filter element
(Not Shown). Discard all old air filter elements.
5. If equipped, install new secondary air filter element
(Not Shown) and install new primary air filter
element (3).
6. Install end cover (4) to air cleaner body (2) and
secure end cover. If necessary, reset the air
service indicator, 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.
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.

Engine Air Cleaner Service Indicator - Inspect

Illustration 72
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.
i02335405
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.
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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