Engine Maintenance
71
Air Restriction Indicator
Excessive restriction of the air intake system
reduces the flow of air to the engine affecting
horsepower output, fuel consumption and engine
life.
An air restriction indicator is installed on the air
intake manifold. Visually inspect the restriction
indicator periodically to assure the air filter is not
restricted. Service the air filter when the yellow
diaphragm indicates 25 in. of vacuum. Press the
reset button on the top of the air restriction
indicator after servicing the air filter.
Figure 48: Air Restriction Indicator
Belts
Belts should be regularly inspected during unit
pretrip inspections for wear, scuffing or cracking.
Belt tension should also be checked during
scheduled maintenance inspections. Belts that are
too loose will whip and belts that are too tight put
too much strain on the belt fibers and bearings.
Using belt tension gauge, P/N 204-427, is the best
method of checking belts for tightness. Install the
belt gauge in the center of the longest belt span.
Press the plunger so the hook will engage the belt.
Make sure the hook is on the face of the belt, not
in a notch. Release the plunger with a quick
motion and without pulling on the belt. Then read
the dial. Use an average of three readings.
NOTE: Do not attempt to remove or install belts
without loosening adjustments. Belts that are
installed by prying over pulleys will fail
prematurely due to internal cord damage.
1. EMI 3000 Air Cleaner Assembly
2. EMI 3000 Air Filter Element
3. Air Restriction Indicator
Figure 47: EMI 3000 Air Cleaner System
Model 30 Shown Model 50 Similar
1
2
3
CAUTION: Do not attempt to adjust belts
with the unit running.
CAUTION: With the unit On/Off switch
in the On position, the unit may start
operation at any time without prior
warning. Switch the unit On/Off switch to
the Off position before performing
maintenance or repair procedures.
AEA710
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