BLADE-SET 9V4578 - Caterpillar

Engine Oil Pressure Switch
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Engine Oil Pressure SwitchDuring normal operation, the engine oil pressure switch is closed to ground. This switch is normally open. The switch opens when engine oil pressure is less than the specified value for the switch. If the switch is in the open position, the controller will notify the operator that the engine oil pressure is insufficient. This switch is normally open, when the switch is not installed on the machine. Key Start Switch
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Key Start SwitchThe key start switch is an input of the engine and pump controller. The key start switch informs the ECM of an attempt to start the engine. Then, the ECM initiates the start procedure.During normal machine operation, the start terminal of the key start switch is open. If the key start switch is placed in the START position the start terminal will close. +Battery voltage is supplied to the start terminal. When all starting conditions are satisfied, the ECM sends a +battery signal to the start relay and engine cranking begins.Note: After the key start switch is initially turned to the START position, the switch will not return to the START position from the ON position. The switch must be turned to the OFF position first. Then, the switch can be turned to the START position.Air Filter Switch
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Air Filter Switch The air filter switch will close, if the air filter is blocked with debris. This switch is normally open. A warning will be displayed on the monitor. However, when a warning of higher priority is occurring at the same time, the warning with the higher priority will be displayed.Hydraulic Oil Filter Switch
When the hydraulic oil filter is clogged, the hydraulic oil filter switch will be open. A warning will be displayed on the monitor. Engine Coolant Level Switch
The engine coolant level switch is an electronic switch that is activated by the coolant. The coolant level switch is closed to ground during normal operation. The switch opens when the coolant level is too low. The open switch informs the controller that the coolant level is too low in the cooling system. Hydraulic Level Switch and Engine Oil Level Switch
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Hydraulic Oil Level SwitchThe hydraulic oil level switch monitors the hydraulic oil level after the starter key switch is held in the ON position for 2 seconds or more. The controller checks hydraulic oil level with the switch. The switch closes when the hydraulic oil level is below the normal operating level. This switch is in the normally open position, when the switch is not installed on the machine.Water Separator Level Switch
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Water Separator Level SwitchWhen the volume of water that has been separated by the water separator reaches a specified volume, the switch is closed. The controller reads the input from the water separator switch. The controller will display a warning on the monitor. The water separator should be inspected. The water separator should be drained.Switch Panel Assembly
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Switch Panel (1) Travel alarm cancel switch (2) Automatic engine