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-4. Troubleshooting: Power Unit Electrical
Use the following sections to help determine and solve problems that may arise within the power unit
electrical system.
VII-4A.
Troubleshooting: Engine Oil Pressure Switch
The " ENGINE OIL PRESSURE SWITCH" is "open" when the engine is running so if this
switch has shut down the engine, then it must be closing. Remove the wire from the switch
and see if the engine will now run without the oil pressure switch connected. Make sure you
do not have the wire that you just disconnected touching the engine or anything that could
ground it. If the engine still shuts down the moment you let go of the "ENGINE SAFETY SHUT
DOWN BUTTON SWITCH" then one of the other two safety switches is shutting down the
engine. To test the switch, start the engine and use an OHM meter to see if the switch is open
by placing one OHM meter lead on the switch terminal and the other OHM lead on the
grounded engine. You should not show any resistance. If the engine is not running you should
show resistance on the OHM meter because the switch will be closed. Replace switch if
necessary.
VII-4B. Troubleshooting: Engine Water Temperature Switch
The "ENGINE WATER TEMPERATURE SWITCH" is normally "open" and will only close if
the water is too hot. If you think the engine has shut down because of a faulty temperature
switch then remove the wire from the switch and try to start the engine again. If the engine
is not running when you release your finger from the "ENGINE SAFETY SHUT DOWN
SWITCH" then you have found your problem, it is the switch. To double check the switch,
put one OHM meter lead on the switch and the other on a the grounded engine. OHM meter
should show no reading. Replace if necessary.
VII-4C. Troubleshooting: Hydraulic Oil Level Switch
The "HYDRAULIC OIL LEVEL SWITCH" is normally "open" when there is oil in the tank filled
to the proper level. The switch is mechanically attached to a float that is submerged in the
hydraulic oil tank. If the oil level drops, so does the float, and the switch will close if the oil level
gets too low. It will also close if the oil level is just slightly above the float but the power unit
is mounted on the back of a crane that is swinging so fast that the oil level is effected by the
washing of the oil in the tank . When the switch closes, it sends a grounded signal that
activates the "ENGINE SAFETY SHUT DOWN BUTTON SWITCH" located on the panel
which cuts power to the fuel solenoid and shuts the engine down. The fuel solenoid must be
energized to allow fuel to get to the fuel pump. If you think the "HYDRAULIC OIL LEVEL
SWITCH" may be causing the engine to shut down, disconnect the wire at the float switch
located on the hydraulic tank. Try to start the engine. If it runs even after you remove your
finger from the "ENGINE SAFETY SHUT DOWN BUTTON SWITCH", then you have located
your problem- the float switch is not working. To check, put one lead of the OHM meter on
the terminal and the other lead on the ground. The meter should not show a reading. If it does,
your oil is too low or the switch is bad. Replace it.
VII. MODEL 260 POWER UNIT (Continued...)
Page 7-11
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