SHANK 5K0245 - Caterpillar

Electrical System
Contactor Switch For Water Temperature
Water Temperature Contactor SwitchThe contactor switch for water temperature is installed in the front cover for the engine. No adjustment to the temperature range of the contactor can be made. The element feels the temperature of the coolant and then operates the micro switch in the contactor when the coolant temperature is too high. The element must be in contact with the coolant to operate correctly. If the cause for the engine being too hot is because of low coolant level or no coolant, the contactor switch will not operate.The contactor switch is connected to the fuel shutoff solenoid to stop the engine. The switch can also be connected to an alarm system. When the temperature of the coolant lowers to the operating range, the contactor switch opens automatically.Pressure Switch
Pressure SwitchThese type pressure switches are used for several purposes and are available with different specifications. They are used in the oil system and in the fuel system. One use of the switch is to open the circuit between the battery and the fuel shutoff solenoid after the oil pressure is below the pressure specifications of the switch. It also closes when the engine starts.Another use of the switch is to close and activate the battery charging circuit when the pressure is above the pressure specification of the switch. It also disconnects the circuit when the engine is stopped.Some switches of this type have three terminal connections. They are used to do two operations with one switch. They open one circuit and close another with a single switch.Electrical Indicators And Sending Units
The electrical indicators and sending units are to operate in electrical balance. Because of this, the voltage and resistance ratings are important to get the correct indications on the indicators. See Attachment Specifications to determine which indicators and sending units can be used with each other.Sending Unit And indicator For Water Temperature
Sending Unit For Water TemperatureThe position of the pointer is changed by the amount of electrical current that flows through the indicator. The water temperature is felt by the bulb of the sending unit. A change in water temperature causes a change of resistance in the sending unit. A change in resistance in the sending unit changes the current flow through the indicator and changes the position of the pointer.Sending Unit And Indicator For Oil Pressure
Oil Pressure Sending UnitThe position of the pointer is changed by the amount of electrical current that flows through the indicator. The oil pressure is felt by the sending unit for the oil pressure indicator. A change in oil pressure causes a change of resistance in the sending unit. A change in resistance in the sending unit changes the current flow through the indicator and changes the position of the pointer.Engine Protection Panel
Engine Protection Panel
(1) Oil pressure gauge. (2) Ammeter. (3) Water temperature gauge. (4) Reset button. (5) Magnetic control switch. (6) Fuse.The engine protection panel has a magnetic control switch (5) in the panel. Pushing in