Perkins 904D-E28T Operation And Maintenance Manual page 36

36
Operation Section
Gauges and Indicators
Refer to Troubleshooting for more information.
Gauges and Indicators
Your engine may not have the same gauges or all the
gauges that are described. For more information
about the gauge package, see the OEM information.
Gauges provide indications of engine performance.
Ensure that the gauges are in good working order.
Determine the normal operating range by observing
the gauges over a period.
Noticeable changes in gauge readings indicate
potential gauge or engine problems. Problems may
also be indicated by gauge readings that change
even if the readings are within specifications.
Determine and correct the cause of any significant
change in the readings. Consult your Perkins dealer
or your Perkins distributor for assistance.
Some engine applications are equipped with
Indicator Lamps. Indicator lamps can be used as a
diagnostic aid. There are two lamps. One lamp has
an orange lens and the other lamp has a red lens.
These indicator lamps can be used in two ways:
• The indicator lamps can be used to identify the
current operational status of the engine. The
indicator lamps can also indicate that the engine
has a fault. This system is automatically operated
via the ignition switch.
• The indicator lamps can be used to identify active
diagnostic codes. This system is activated by
pressing the Flash Code button.
Refer to the Troubleshooting Guide, "Indicator
Lamps" for further information.
NOTICE
If no oil pressure is indicated, STOP the engine. If
maximum coolant temperature is exceeded, STOP
the engine. Engine damage can result.
Engine Oil Pressure – The oil pressure
should be greatest after a cold engine is
started. The typical engine oil pressure
with SAE10W30 is 207 kPa to 413 kPa
(30 psi to 60 psi) at rated rpm.
A lower oil pressure is normal at low idle. If the
engine speed and load are stable and the gauge
reading changes, perform the following procedure:
1. Remove the load.
2. Stop the engine.
3. Check and maintain the oil level.
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allowable temperature with the pressurized
cooling system at 90 kPa (13 psi) is 112° C
(233.6° F). Higher temperatures may occur under
certain conditions. The water temperature
reading may vary according to load. The reading
should never exceed the boiling point for the
pressurized system that is being used.
The coolant temperature is measured at the outlet for
the water temperature regulator. The engine coolant
temperature is monitored by the engine sensors and
the engine ECM. This programming cannot be
altered. Derates can occur if the maximum engine
coolant temperature is exceeded.
If the engine is operating above the normal range,
reduce the engine load. If high coolant temperatures
are a frequent event, perform the following
procedures:
1. Reduce the load on the engine.
2. Determine if the engine must be shut down
immediately or if the engine can be cooled by
reducing the load.
3. Inspect the cooling system for leaks. If necessary,
consult your Perkins dealer or your Perkins
distributor for assistance.
position without load, the engine is running at
high idle. The engine is running at the full load
rpm when the throttle control lever is at the full
throttle position with maximum rated load.
To help prevent engine damage, never exceed the
high idle rpm. Overspeeding can result in serious
damage to the engine. Operation at speeds exceed-
ing high idle rpm should be kept to a minimum.
the indicator should be to the " " +" " side of " " 0" "
(zero).
switch is in the " " on" " position.
Jacket Water Coolant Temperature –
Typical temperature range is 82° to 96°C
(147.6° to 172.8°F). The maximum
Tachometer – This gauge indicates
engine speed (rpm). When the throttle
control lever is moved to the full throttle
NOTICE
Ammeter – This gauge indicates the
amount of charge or discharge in the
battery charging circuit. Operation of
Fuel Level – This gauge indicates the
fuel level in the fuel tank. The fuel level
gauge operates when the " " START/STOP" "
Service Hour Meter – The gauge
indicates total operating hours of the
engine.
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