LIGHTING GP-FLOOD 2508112 - Caterpillar

Gauges
Gauges provide a "look" inside the engine. Be sure they are in good working order. You can determine what is "normal" operating range by observing the gauges over a period of time. The cause of any sudden or significant change in the readings should be determined and corrected.OIL PRESSURE - Oil pressure is normally greatest after starting a cold engine. As the oil warms up the pressure drops. Oil pressure is greater at operating speeds than at low idle. Fluctuating readings can mean air in the oil or a sticking pressure relief valve. Stop the engine immediately if a sudden loss of oil pressure occurs.WATER TEMPERATURE - The operating temperature is maintained by the water temperature regulator. High coolant temperatures mean the cooling system is not dissipating enough engine heat.The minimum operating temperature should not be below 175°. If the temperature gauge continues to indicate below 175° while operating, have the gauge checked for accuracy and the thermostats checked for proper operation.
OIL PRESSURE
WATER TEMPERATURE
AMMETERIn cold weather the temperature gauge may fluctuate in or near the cold range. This indicates the engine is being overcooled. In these instances the use of radiator louvers is suggested.AMMETER - The ammeter should register in the charging range when the engine is running above low idle. If the gauge still registers a discharge as the engine speed is increased, determine the cause.Automatic Start-Stop
An automatic start-stop system ensures that power is supplied to a load when the normal power source is interrupted. The cranking panel is the heart of the system and consists of the failure warning system and relays to start and stop the engine. When a power failure occurs the system senses the failure, starts the engine and transfers the load to standby. When power is restored, it senses power restoration, transfers the load from standby and stops the engine. The major use of automatic start-stop system is standby electric sets. This discussion is limited to that application.The remote contacts close when a power failure occurs and completes the circuit to the cranking timer and the start slave relay. The start slave relay completes the circuit to the starter motor and the engine begins cranking.As the engine starts and increases in speed, the frequency sensing relay turns off the cranking timer and starts the slave relay. This disconnects the starter motor circuit and protects the starter from overspeed damage. If the engine fails to start, the cranking timer will time out and lock the start circuit open, preventing the batteries from being discharged.During the cranking cycle, the safety shutoffs are inoperative to prevent a low oil pressure shut down. When oil pressure reaches a safe level the safety circuit is armed by the arming relay. High water temperature or low oil pressure will now stop the engine and prevent major damage.If an unsafe engine condition exists, a sending unit completes the circuit to the safety relay and locking relay. The safety relay de-energizes the fuel solenoid and stops the engine. The locking