Hydraulic Circuitry; Hydraulic Clamp; Vibrator Drive - J&M 44-50 Operating And Maintenance Manual

MODEL 44-50
VIBRATORY
DRIVER/EXTRACTOR
V.

HYDRAULIC CIRCUITRY

A. HYDRAULIC CLAMP
With the diesel engine running, hydraulic fl uid is taken from the reservoir by the clamp pump
(P2). The clamp pump fl ow returns to the reservoir if the clamp switch on the pendant has
not been moved. Returning oil is fi ltered by the return fi lter (F2).
Turning the clamp switch on the control pendant to CLOSE activates the CLAMP CONTROL
VALVE (V1). Hydraulic fl uid is directed to the CLOSE CLAMP side of the hydraulic
CYLINDER (CYL) in the hydraulic clamp. The clamp closes. Clamping pressure is indicated
by the clamp pressure gage (GA-3). When clamping pressure reaches approximately 4800
PSI (331 Bar), the CLAMP PRESSURE SWITCH (PS-1) deactivates the CLAMP CONTROL
VALVE (V1), which directs the fl ow from the clamp pump to the reservoir. Pressure at the
clamp is maintained by the CLAMP CHECK VALVE (CV5). If clamping pressure falls below
4500 PSI (310 Bar), the CLAMP PRESSURE SWITCH activates the CLAMP CONTROL
VALVE to restore pressure. In the event of hose failure, a second CLAMP CHECK VALVE
(CV7), located in the CLAMP CYLINDER, will hold the CLAMP CYLINDER closed.
Turning the clamp switch on the control pendant to OPEN activates the CLAMP CONTROL
VALVE (V1). Hydraulic fl uid is directed to the OPEN CLAMP side of the hydraulic cylinder.
The pressure in the OPEN CLAMP line opens the CLAMP CHECK VALVE (CV5). The clamp
opens. Pressure in the OPEN CLAMP line is indicated by the clamp pressure gage (GA-4).
Pressure in the clamping circuit is limited to 4800 PSI by the clamp relief valve (RV2).
The quick-disconnect couplers (QD3 & QD4) permit de-coupling of the clamp hoses at the
power unit.
B. VIBRATOR DRIVE
With the diesel engine running, hydraulic oil is taken from the reservoir by the DRIVE
PUMPS (P1). Oil pressure opens the cartridges CA1, CB1 and vents the hydraulic oil back
to the reservoir the the RETURN FILTERS (F2), if the vibrator switch is in the OFF position.
Turning the vibrator switch to FORWARD activates the FORWARD SOLENOID on the
CONTROL VALVE (V2), directing pump fl ow to the VIBRATOR MOTOR (M).
Clamp pump may also be used to power some auxiliary functions.
Contact J&M for information on "POWER BEYOND" modifi cations.
V-1
OPERATING
INSTRUCTIONS