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AUTOMATIC ALARMS AND SAFEGUARDS
SAND LIGHT
A SAND light on the control console will come on at any time the sanding switch is operated to apply sand.
DOOR CLOSED LIGHT
An operator's DOOR CLOSED signal light on the control console will come on when all doors of the train are closed and the train is ready for powering.
LOW-OIL AND LOW-WATER LIGHTS
(YELLOW) (See Fig.
2)
Two yellow lights indicate when faults exist in either the lube oil or water systems. One yellow light on the Engine Control Panel will light when the engine lube-oil pressure is low. Another yellow light will come on when the cooling-water pressure is low.
If engine lubricating-oil pressure drops to between 7 to 10 psi at IDLE rpm, or between 45 to 52 psi at full speed, the engine shuts down and a yellow LOW OIL indicating lamp lights. After the engine shuts down, the alarm bell will sound as long as the engine control switch (EC) is not in START position.
A yellow LOW WATER indicating lamp will also come on if the water pressure is low.
After the engine shuts down, move the EC switch to START to silence the alarm bell. Check the lubricating-oil supply on the dipstick. Check for broken or cracked oil lines. Also check the water supply at the storage tank and check for water piping leaks.
To restart the diesel engine after the fault is corrected :
Depress the shutdown plunger on the engine governor until it clicks and stays in.
NOTE : The engine governor is equipped with two shutdown plungers, one for low oil and one for low water. Be sure both plungers are reset.
Depress the engine start button.
After the engine is running, recheck for signs of distress.
If the condition is normal, put the locomotive "on the line" and recheck for signs of distress.
If the engine fails to start due to LOW-OIL PRESSURE RESET button tripping, do not repeat cranking.
If locomotive units are being operated in multiple, then the engine on the affected unit only will shut down.
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