HOSE AS 2464546 - Caterpillar

Engine Start
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Engine start circuitThe components of the engine start circuit are the key start switch, the Power Train Electronic Control Module (Power Train ECM), the Engine Electronic Control Module (Engine ECM), the start relay magnetic switch, the main relay magnetic switch, the electric starting motor solenoid, the electric starting motor, the transmission control (STIC steering), the fire suppression control loop receptacle (foam type), and the fire suppression control loop plug (dry powder type).
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Dash panel (1) Key start switch (2) OFF position (3) ON position (4) START position
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Cab (5) Power Train ECM
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Left side view of engine (6) Engine ECMWith the battery disconnect switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker 11 to Engine ECM (6). With key start switch (1) in ON position (3), 24 volt power is supplied from the batteries via circuit breaker 5 to Engine ECM (6) and via circuit breaker 9 to Power Train ECM (5).
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Left side view of engine (7) Start relay magnetic switch
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Side view of cab (8) Main relay magnetic switch
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Left side view of engine (9) Electric starting motor solenoid (10) Electric starting motor
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Cab (11) Transmission control (STIC steering) (12) Transmission direction control switchWhen key start switch (1) is in START position (4), Power Train ECM (5) supplies 24 volt power to start relay magnetic switch (7). Power then returns to Power Train ECM (5) to ground. Power Train ECM (5) will energize main relay magnetic switch (8) when transmission direction control switch (12) is in the NEUTRAL position. When start relay magnetic switch (8) is energized, 24 volt power is supplied to electric starting motor solenoid (9) and to electric starting motor (10). Electric starting motor (10) will begin to crank.ReferenceFor information on the engine start switch in the OFF position, refer to Systems Operation, Testing and Adjusting, Machine Electrical System, "Engine Stop".