Grove Published 01-29-2015, Control # 512-01 7-11
TMS700E SERVICE MANUAL POWER TRAIN
AIR INTAKE SYSTEM
Description
The engine air intake system (Figure 7-8) consists of an air
cleaner and associated piping for channeling the air from the
atmosphere to the engine intake manifold.
The air cleaner is the dry-type with a replaceable element. It
is located on the right front fender. A service indicator,
designed to indicate red when servicing is required, is
installed at the air cleaner outlet.
The automatic cold weather starting system consists of ECM
wiring, valve assembly, and starting fluid bottle and tubing.
The quick start system is activated to facilitate engine
starting during cold temperatures. When activated, the
system actuates the valve assembly, passing starting fluid
from the bottle through the atomizer into the air intake
manifold where it mixes with the intake air to facilitate engine
combustion.
Maintenance
Troubleshooting
Dust passing the air cleaner, even through small holes, can
cause rapid engine wear. Ensure all connections between
the air cleaner and the engine are tight and sealed. If these
connections are all 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. Any damaged parts must
be replaced.
5. Inspect the restriction indicator tap for leaks.
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 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 0.062 bar (25 inches
of water) maximum with a dirty air cleaner at maximum
governed RPM.
A service indicator on the air cleaner housing will indicate
when the filter needs to be cleaned or replaced. Reset the
indicator each time the air cleaner is serviced. If the
indicator’s accuracy is suspect, a water manometer is the
most accurate and dependable method of measuring
vacuum.
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 maximum 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. Restriction indicators are
generally marked with the restriction at which the red signal
flag locks up.
If the initial restriction on a new or clean filter reads above the
maximum allowed for the engine, check the following items.
1. Ensure the air cleaner inlet is not plugged.
2. Inspect the air cleaner outlet to be sure it is not plugged
by paper, rags, etc.
3. Ensure the correct size connections are used between
the air cleaner and the engine.
4. Ensure all inlet accessories are the correct size and are
not plugged by any foreign object.
Filter Element Replacement
1. Release the latch and open the air cleaner body, and
withdraw the element as follows:
a. RELEASE THE SEAL GENTLY. The filter element
fits tightly over the outlet tube, creating the critical
seal on the inside diameter of the filter endcap. The
filter should be removed gently to reduce the
amount of dust dislodged. There will be some initial
resistance, similar to breaking the seal on a jar.
Gently move the end of the filter up and down and
side to side or twist to break the seal.
CAUTION
Never service the air cleaner while the engine is running.
Reference Only
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