Grove Published 11-10-2014, Control # 524-00 7-9
RT880E SERVICE MANUAL POWER TRAIN
The Air Cleaner (Figure 7-3) is the dry-type with a
replaceable element and is located on the right rear fender.
An Air Intake Restriction Monitor (AIRM) system is designed
to calculate real-time air filter restriction at operational flow
rate using the temperature and pressure input from the
TBAP sensor installed on the air cleaner housing.
On the Cummins QSB Engine there are electric air heating
elements that are located in the engine’s intake air stream.
These elements heat the intake air when starting the engine
in cold ambient conditions. Startability and white smoke
control are enhanced by the use of the intake air heater. A
Wait-to-Start Lamp is located on the center front console to
indicate when to crank the engine.
Air Intake
Air Cleaner Checks
Dust passing the air cleaner can cause rapid engine wear. All
connections between the air cleaner and the engine must be
tight and sealed. If these connections are well sealed, and
there is still evidence of dust leakage, check the following
places for possible trouble.
NOTE: Dust that gets by the air cleaner system can often
be detected by looking for dust streaks on the air
transfer tubing or just inside the intake manifold
inlet.
1. Inspect the air cleaner outlet tube for damage.
2. Ensure the element gasket washer is not damaged and
the washer’s rubber face seals against the element.
3. Inspect the element gasket for damage.
4. Check for structural failures and replace damaged parts.
Check for Filter Restriction
As a dry cleaner element becomes loaded with dust, the
vacuum on the engine side of the air cleaner (at the air
cleaner outlet) increases.
The vacuum is generally measured as restriction in
kilopascals or inches of water. The engine manufacturer
places a recommended limit on the amount of restriction the
engine will stand without loss in performance before the
element must be cleaned or replaced. Cummins allows a
vacuum of 6.2 kPa (25 inches of water) maximum with a dirty
air cleaner at maximum governed RPM.
A TBAP sensor attached to the air cleaner housing provides
input to the Air Intake Restriction Monitor (AIRM) system to
activate a fault code when the filter needs to be replaced.
The Engine Warning Indicator will blink at engine start for
fault code 5576 indicating the air cleaner is becoming
clogged. The indicator will be on solid for fault code 3341
indicating the filter is clogged and must be changed. If the
TBAP’s accuracy is suspect, a water manometer connected
to the filtered pressure tap is the most accurate and
dependable method of measuring.
To use the manometer, hold it vertically and fill both legs
approximately half full with water. One of the upper ends is
connected to the restriction tap on the outlet side of the air
cleaner by means of a flexible hose. The other end is left
open to the atmosphere.
Maximum restriction in the air cleaner occurs at maximum air
flow. On this turbocharged diesel engine, the maximum air
flow occurs only at rated engine power.
With the manometer held vertically and the engine drawing
maximum air, the difference in the height of the water
columns in the two legs, measured in inches or centimeters,
is the air cleaner restriction.
If the initial restriction on a new or clean filter reads above the
maximum allowed for the engine, check the following items:
• Ensure the air cleaner inlet is not plugged.
• Inspect the air cleaner outlet to be sure it is not plugged
by paper, rags, etc.
• Ensure the correct size connections are used between
the air cleaner and the engine.
• Ensure all inlet accessories are the correct size and are
not plugged by any foreign object.
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