AttachmentsAlarm SwitchesAlarm switches are set at a less critical tempera ture,pressure, or level limit than the comparable shutoffcontrol. The alarm switch warns the operator that anunsafe operating condition is starting to occur.Corrective measures should be taken to avoid possibledamage to the engine and/or a possible shutdown of theengine.CAUTIONIt could be hazardous to have the engine stop unexpectantly when engine power is needed. However, if the engine overspeeds, the engine must bestopped immediately.When the preset temperature, pressure or fluid leveloccurs, the alarm switch will either turn on a light or anaudible alarm. The light or alarm will continue tooperate until the condition is correct ed. When thecondition is corrected the alarm will automatically resetand the light will turn off.CAUTIONThe cause of the shutdown must be investigatedand corrected before starting the engine.Alarm Shutoff SwitchA switch may be installed in the alarm circuit forsilencing the alarm while the engine is stopped forrepairs. Before starting, be sure the switch is moved tothe closed (ON) position, and the warn ing lights are lit.CAUTIONIf the switch is left in the open (OFF) position whenthe engine is started, the engine will not beprotected.Testing Indicator LightsMost control panels are equipped with a test switch.Turn the switch ON, to check all of the indicator lights forproper operation. Test the in-dicator lights periodically. Replace burned out lightbulbs immediately.Testing Shutoff Devices and AlarmsHave all shutoff controls and alarms on the enginechecked twice a year by your Caterpillar dealer.It is important that these controls function properly. Theiroperating condition can only be checked by simulatingextreme operating conditions undercontrolled testing procedures. To avoid damage to theengine, only authorized personnel should conduct thesechecks.20
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