Air Cleaner Restriction - Navistar MaxxForce 7 Operation And Maintenance Manual

SECTION 5 – MAINTENANCE SCHEDULE AND SERVICE PROCEDURES
Service Procedures (cont.)

AIR CLEANER RESTRICTION

Service Interval: Before Engine Operation
Figure 28 Air Cleaner Restriction Indicator
Observe the restriction reading on the air filter restriction gauge.
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If the yellow restriction indicator is at or near the red zone,
the restriction is high and a new air filter should be installed to
prevent reduced fuel economy, low engine power, or engine
damage.
Push reset button and observe the movement of the air
restriction indicator to make sure it is not locked up. If the air
filter was not changed, the yellow indicator will return to the
same reading when the vehicle is driven under normal driving
conditions.
1. Remove plugged air filter element and discard.
CAUTION: To prevent engine damage, do not use compressed
air to clean filter housing.
2. Use a clean water-dampened cloth to clean inside of air filter
housing.
3. Inspect air filter housing for damage or distortion. Install new
housing, if necessary.
4. Verify nothing has fallen into the filter housing prior to
installing a new filter element.
5. Install a new air filter element.
6. Push reset button on air restriction indicator. The yellow
indicator will return to zero.