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Gauges and Indicators

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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:

Remove the load.

Stop the engine.

Check and maintain the oil level.

Jacket Water Coolant Temperature –
Typical temperature range is 82° to 96°C
(147.6° to 172.8°F). The maximum

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.
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:

Reduce the load on the engine.

Determine if the engine must be shut down

immediately or if the engine can be cooled by

reducing the load.

Inspect the cooling system for leaks. If necessary,

consult your Perkins dealer or your Perkins

distributor for assistance.

Tachometer – This gauge indicates
engine speed (rpm). When the throttle
control lever is moved to the full throttle

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.

NOTICE

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.

Ammeter – This gauge indicates the
amount of charge or discharge in the
battery charging circuit. Operation of

the indicator should be to the

““

””

side of

““

””