CYLINDER HEAD GP 1726704 - Caterpillar

The engine control switch on the automatic start-stop control panel is an automatic control switch (ACS). The four positions of the automatic control switch (ACS) are: OFF/RESET, AUTO, MAN and STOP position.When the generator is to be used as a standby electric power unit, the automatic control switch is put in the AUTO position. Now, if the normal (commercial) electric power stops, the engine starts and the generator takes the electric load automatically. When the normal (commercial) electric power is ON again, for the electric load, the circuit breaker for the generator electric power automatically opens and the generator goes off the electric load. After the circuit breaker for the generator opens, the engine automatically stops.When the automatic control switch (ACS) is moved to the MAN position, the engine starts. It is now necessary for the circuit breaker for the generator electric power to be closed manually. If the generator is a standby electric power unit and the automatic control switch (ACS) is in the MAN position when normal (commercial) electric power is ON again, the generator circuit breaker opens and the engine stops automatically the same as when the switch (ACS) is in the AUTO position.The engine will stop with the automatic control switch (ACS) in either the AUTO or MAN positions if there is a not normal condition in the engine. The not normal condition in the engine that can stop the engine is either low lubricating oil pressure, high engine coolant (water) temperature or engine overspeed (too much rpm). When any of these conditions stops the engine, the light for the not normal condition will stay ON after the engine is stopped. The fourth not normal condition light is ON only when the starting motor runs the amount of seconds for the overcrank timer (engine does not start).Move the automatic control switch (ACS) to the OFF/RESET position and the not normal condition light goes OFF.It may be necessary to make a reference to the list of abbreviations for the names of the parts, switches, relays and lights that are on the schematics of the engine control group (ECG).ACSAUTOMATIC CONTROL SWITCHARARMING RELAYASOAIR SHUTOFF SOLENOIDBATT.BATTERYBCBATTERY CHARGERCBCIRCUIT BREAKERCB/aNORMALLY OPEN CIRCUIT BREAKER AUXILIARY CONTACTCB/bNORMALLY CLOSED CIRCUIT BREAKER AUXILIARY CONTACTCBRCIRCUIT BREAKER RELAYCCRCYCLE CRANK RELAYCCMCYCLE CRANK MODULECCTCYCLE CRANK TIMERCCRCOOLDOWN RELAYCCMCOOLDOWN MODULECDTCOOLDOWN TIMERCLLCOOLANT LEVEL LOW LIGHT (PREALARM)CSCIRCUIT BREAKER CONTROL SWITCHCTSCRANK TERMINATION SWITCHCCIRCUIT BREAKER CLOSED LIGHTDDIODEDCADIRECT CURRENT READING AMMETERDSSDUAL SPEED SWITCHFPFUEL PRESSUREGCRGOVERNOR CONTROL RELAYGOV.GOVERNORGSGOVERNOR SWITCHGSMGOVERNOR SPEED MOTORHWTHIGH WATER TEMPERATURE LIGHT (PREALARM)ICINITIATE CONTACTLCLCOOLANT LEVEL LOW SWITCH (PREALARM)LFLLOW FUEL LEVEL LIGHT (PREALARM)LFSLOW FUEL LEVEL SWITCH (PREALARM)LOLLOW OIL LEVEL LIGHT (PREALARM)LWTLOW WATER TEMPERATURE SWITCHOCIRCUIT BREAKER OPEN LIGHTOCLOVERCRANK LIGHTOCROVERCRANK RELAYOCTOVERCRANK TIMEROLLOIL LEVEL LOW LIGHT (PREALARM)OPLLOW OIL PRESSURE LIGHTOPPLOW OIL PRESSURE PREALARM SWITCHOPRLOW OIL PRESSURE RELAYOPSLOW LUBE OIL PRESSURE SWITCHOPTOIL PRESSURE TIMEROPTDOIL PRESSURE TIME DELAYOSLOVERSPEED LIGHTOSROVERSPEED RELAYOSSOVERSPEED SWITCHPSPRESSURE SWITCHPSWPRESSURE SWITCHRPLREVERSE POWER LIGHTRPRREVERSE POWER RELAYRPREREVERSE POWER RELAY RESET SWITCHRPRXREVERSE POWER RELAY AUXILIARYRRRUN RELAYSHTCSHUNT TRIP COILSRSHUTDOWN RELAYSSSHUTDOWN SOLENOIDSUP.SUPPRESSORTTRIP POSITIONWLTLOW WATER TEMPERATURE LIGHT (PREALARM)WTLWATER TEMPERATURE LIGHT (HIGH)WTPHIGH WATER TEMPERATURE SWITCH (PREALARM)WTRWATER TEMPERATURE RELAY (HIGH)WTSWATER TEMPERATURE SWITCH (HIGH)Standby Condition
When the generator is