STG global TANVAC HDV3000, Operator'S Manual

Page: 68 / 329

Features and Controls
i01007515
Engine Shutoffs and Engine
Alarms
SMCS Code: 1900; 7400; 7418
Shutoffs
Shutoffs and alarms are electrically operated or
mechanically operated. The operation of all electric
shutoffs and alarms utilize components which
actuate switches in a sensing unit.
Shutoffs are set at critical levels for the following
items: operating temperature, operating pressure,
operating level and operating rpm. The particular
shutoff may need to be reset before the engine will
start.
NOTICE
Always determine the cause of the engine shutdown.
Make necessary repairs before attempting to restart
the engine.
Be familiar with the following items:
• Types and locations of shutoff
• Conditions which cause each shutoff to function
• The resetting procedure that is required to restart
the engine
Alarms
Alarms consist of a switch and a contactor. The
switches are wired to the contactors. The contactors
activate alarm circuits in an annunciator panel. Your
engine may be equipped with the following switches:
Engine oil pressure – The engine oil pressure
switch indicates when oil pressure drops below rated
system pressure.
Coolant level
– The low coolant level switch
indicates when the coolant level is low.
Coolant temperature – The coolant temperature
switch indicates high jacket water coolant
temperature.
Note: The sensing element of the coolant
temperature switch must be submerged in coolant in
order to operate.
Engines may be equipped with alarms in order to
alert the operator when undesirable operating
conditions occur.
NOTICE
When an alarm is activated, corrective measures
must be taken before the situation becomes an emer-
gency in order to avoid possible engine damage.
If corrective measures are not taken within a
reasonable time, engine damage could result. The
alarm will continue until the condition is corrected.
The alarm may need to be reset.
A switch may be installed in the alarm while the
engine is stopped for repairs. Before the engine is
started, ensure that the switch is moved to the ON
position and that the warning lights are flashing. The
engine will not be protected if the switch is left in the
OFF position.
Testing the Shutoff and Alarm
System
Most control panels are equipped with a lamp test
switch. Turn the switch to the ON position in order to
check the indicator lights for proper operation.
Replace defective bulbs immediately.
NOTICE
During testing, abnormal operating conditions must
be simulated. Perform the tests correctly in order to
help prevent possible engine damage.
Refer to the Service Manual for more information on
testing procedures or consult your Caterpillar dealer.
i02613889
Fuel Shutoff
SMCS Code: 1259; 1704
The fuel shutoff solenoid is located on the fuel
injection pump. When the fuel shutoff solenoid is
activated, the solenoid moves the fuel rack to the
“
OFF
”
position.
Illustration 33 g01305771
Typical example
(1) Fuel shutoff solenoid
SEBU8312-03 31
Operation Section
Features and Controls