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MODEL 44-50
VIBRATORY
DRIVER/EXTRACTOR
VI.
ELECTRICAL CIRCUITRY
D. CLOSING HYDRAULIC CLAMP
With the diesel engine running, turning the clamp switch (OPEN-CLOSE), on the control
pendant to CLOSE energizes the close-clamp solenoid (CLOSE-SOL.). This operates the
clamp control hydraulic valve and closes the clamp.
When the pressure in the close-clamp hydraulic circuit reaches 4800 PSI, the pressure
switch (PS-1) opens and de-energizes the close-clamp solenoid and turns on the CLAMP
LIGHTS on the control pendant and control panel. If close-clamp pressure falls below
4500 PSI, the pressure switch closes and re-energizes the close-clamp solenoid to rebuild
pressure. The CLAMP LIGHTS go out. When pressure returns to 4800 PSI, The pressure
switch opens de-energizing the close-clamp solenoid and turns on the CLAMP LIGHTS.
E. OPENING HYDRAULIC CLAMP
With the diesel engine running, turning the clamp switch (OPEN-CLOSE) to OPEN energizes
the open-clamp solenoid (OPEN SOL.). The clamp opens.
F. STARTING VIBRATOR
With the diesel engine running, turning the vibrator switch on the control pendant to the
FORWARD position energizes the forward SOLENOID on the control valve(V2). The control
valve directs hydraulic fluid to the hydraulic motors and the vibrator starts.
G. STOPPING VIBRATOR
With the diesel engine running, turning the vibrator switch on the control pendant to the
center position de-energizes the forward SOLENOID. Fluid no longer is directed to the
motors and they stop.
VI-3
OPERATING
INSTRUCTIONS
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