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
12. "WATER TEMPERATURE" Switch
A water temperature switch is mounted on the engine. It is a normally "open" switch. If the
water temperature increases to a level that may damage the engine, the switch closes,
sending a grounded signal that activates the "ENGINE SAFETY SHUTDOWN" Switch
located on the panel. This switch can give a faulty signal and cause the engine to shut down
even when water temperature is normal. To test the switch, disconnect the wire leading to it.
Test the switch using an OHM meter by placing one OHM lead to the switch terminal and one
to the grounded engine. You should not see a reading on the OHM meter (provided the water
temperature is below 207 degrees F.). If the OHM meter shows resistance then replace the
switch.
13. "FUEL PRESSURE" Gauge
An electric FUEL PRESSURE Gauge is provided to monitor engine fuel pressure. An
electrical variable resistor mounted on the fuel system sends a signal to the gauge. The
sender is designed to send a signal to the panel gauge as pressure increases which increases
the gauge reading.
14. "TACHOMETER"
A "TACHOMETER" is provided to monitor the engine speed for optimum operation. The
tachometer is digital and operates off a magnetic pickup that receives a signal from the
flywheel of the engine. Note: If the tachometer seems to be reading wrong, check with a photo
tach. Adjustments can be made on the back of the tachometer. Consult factory for proper
setting of tach switches.
VII-2C.
Preparing The Electrical System For Start-Up
To start the engine the (CIRCUIT BREAKER) should be in the "ON"" position (PUSHED IN AND
LOCKED) and the FORWARD/OFF/REVERSE switch both on the panel and on the pendant should be
in the off position. The engine will not start if the DRIVE/OFF/FORWARD switch is in the "ON" position.
This prevents the operator from accidentally starting the engine and setting the vibrator or drill into
motion the moment the engine starts.
VII-2D. Engine Safety Shut-Down Button Switch
The "ENGINE SAFETY SHUT DOWN BUTTON SWITCH" turns on and off the fuel solenoid that is
mounted on top of the engine. The button must be depressed in order to get power to the fuel solenoid
and allow the engine to receive fuel to the fuel pump. Three safety switches: (1. Water Temperature, 2.
Engine Oil Pressure and 3. Hydraulic oil level) on the power unit are wired into the "ENGINE SAFETY
SHUT DOWN BUTTON SWITCH" and will shut the engine off automatically if any of these three switches
is closed. (Please see "Engine Safety Shut-Down (Three Causes Of Engine Shut-Down) in this manual
for detailed instructions on how these switches work and read the TROUBLESHOOTING SAFETY
SHUT DOWN SWITCHES in this manual to render repairs. It is very simple, please make the effort to
read and understand these switches and how they work.)If the button pops back out the moment you
release your finger from the button, then one or more of the three shut down switches is closing and
grounding the "ENGINE SAFETY SHUT DOWN SWITCH". This will happen for the described in the
following section of this manual.
VII. MODEL 260 POWER UNIT (Continued...)
VII-2B. Controls: (Understanding How They Work) (Continued...)
Page 7-7
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