Engine Maintenance
67
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 45: 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 44: EMI 3000 Air Cleaner System
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
Summary of Contents for Spectrum DE 30-2
Page 4: ...4...
Page 12: ...Safety Precautions 12...
Page 16: ...Specifications 16...
Page 31: ...Unit Description 31 1 Access Panels 2 Defrost Dampers Figure 12 Back View of Unit 1 2 AGA215...
Page 42: ...Operating Instructions 42...
Page 48: ...Electrical Maintenance 48...
Page 106: ...Structural Maintenance 106...
Page 110: ...Mechanical Diagnosis 110...
Page 114: ...Remote Evaporator Specifications 114...
Page 116: ...Remote Evaporator Maintenance Inspection Schedule 116...
Page 122: ...Remote Evaporator Electrical Maintenance 122...
Page 126: ...Remote Evaporator Refrigeration Service Operations 126...
Page 128: ...Remote Evaporator Structural Maintenance 128...
Page 130: ...Remote Evaporator System Diagnosis 130...
Page 134: ...Wiring and Schematic Diagrams Index 134...
Page 135: ...135 Schematic Diagram Page 1 of 2...
Page 136: ...136 Schematic Diagram Page 2 of 2...
Page 137: ...137 Wiring Diagram Page 1 of 4...
Page 138: ...138 Wiring Diagram Page 2 of 4...
Page 139: ...139 Wiring Diagram Page 3 of 4...
Page 140: ...140 Wiring Diagram Page 4 of 4...