7032 SOUTH 196th - KENT, WA 98032 - (253) 872-0141 / FAX (253) 872-8710
OPERATION / MAINTENANCE MANUAL
MODEL 50 VIBRATORY HAMMER WITH MODEL 260 POWER UNIT
VII. MODEL 260 POWER UNIT (Continued...)
Page 7- 8
VII-2F. Engine Safety Shut-Down (Three Causes Of Engine Shut-Down)
1. No Oil Pressure
The engine oil pressure is used to open and hold open a small pressure switch mounted on
the diesel engine. The engine oil pressure holds open the oil pressure switch as long as the
engine is running and there is proper engine oil pressure. If the oil pressure drops, (NO OIL
PRESSURE COULD RESULT IN A DESTROYED ENGINE) the switch closes and grounds
the ENGINE SAFETY SHUT DOWN SWITCH located on the control panel which activates
and cuts power to the fuel solenoid and shuts the engine down, saving the engine from
possible damage due to lack of oil. Sometimes the oil pressure switch fails and sends a
grounded signal to the "ENGINE SAFETY SHUT DOWN SWITCH" even when the oil
pressure is fine. Please read the section titled "TROUBLESHOOTING: ENGINE OIL
PRESSURE SWITCH" in this manual if you think this may have happened.
2. High Engine Coolant Temperature
The engine coolant or engine water temperature is controlled by a temperature switch. This
switch, located on the front of the engine, is normally open when the coolant temperature is
normal. If the engine coolant becomes too hot the switch closes and sends a grounded signal
which activates the "ENGINE SAFETY SHUT DOWN SWITCH" located on the panel. When
this happens, power is cut to the fuel solenoid and the engine stops which prevents the engine
from overheating and destroying itself. Sometimes this switch fails to work properly and shuts
the engine down even when the water temperature is fine. Please read the section titled
"TROUBLESHOOTING: ENGINE WATER TEMPERATURE SWITCH" in this manual if you
think this may have happened.
3. Low Hydraulic Oil Temperature
The hydraulic oil level in the tank is controlled by an oil level switch that is normally open when
oil is in the tank at an acceptable level for operation. If the hydraulic oil level drops below
the required level, the switch will close and send a grounded signal activates the "ENGINE
SAFETY SHUT DOWN SWITCH" located on the panel. When this happens, power is cut to
the fuel solenoid and the engine stops which prevents the hydraulic pumps from destruction
due to lack of hydraulic oil. Some times this switch fails to work properly and shuts the engine
down even when the oil level in the tank is normal. Please read the section titled "TROU-
BLESHOOTING: HYDRAULIC OIL LEVEL SWITCH" in this manual if you hink this may have
happened.
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