5
IMPORTANT:
The lower valve is closed by spring
pressure. If it does not close completely against the
valve seat, the plow can slowly lower after the raise
switch is released. If this occurs, cycle the plow
through a raise and lower cycle a few times to flush
out anything that may be between the valve and seat,
this also allows the valve and valve seat to mate and
seal.
Down Pressure (DP) System
The Down Pressure (DP) System consists of two
separate but interactive electrical circuits, both controlled
by the DP Toggle Switch.
• 4-Way Valve - Controls fluid flow to and from the Raise
Cylinder and establishes either a float or DP
condition.
• DP Pressure Switch - a pressure sensitive ON switch
that controls the pressure available to the DP
system by limiting the Motor run time in the DP
mode.
Electrical current is provided to the DP Toggle Switch
center terminals (common) through the 14 Pnk wires from
the Raise/Lower Switch "lower" terminals. The
Raise/Lower Switch must be in the Lower position for the
DP to be activated. The Raise/Lower Switch receives
power through the 9 RED/BLK wire, any time the vehicle
key switch is in the ACC or RUN position.
Positioning the DP Toggle Switch to ON supplies power to
the Indicator Light, and allows current to flow, through 11
Blue wire, to the Four-way Valve. Current also flows from
the DP Toggle Switch, through 12 Yellow wire, and
supplies power to the Pressure Switch.
• The 4-Way Valve, when energized, directs fluid flow to
the rod end of the Raise Cylinder creating pressure
in the Raise Cylinder and forcing the plow down.
When the 4-Way Valve is de-energized (Down
Pressure Toggle Switch in the OFF position) a
spring returns the 4-Way valve to a open port
position that opens all ports in the Raise Cylinder
allowing the blade to float and follow the contour of
the ground.
• The DP Pressure Switch senses hydraulic pressure in
the rod end circuit of the Raise Cylinder. When
pressure falls below the Pressure Switch preset, the
Pressure Switch closes and current is supplied,
through 14 Tan wire, to activate the Motor Solenoid
allowing the 12VDC Motor and Hydraulic Pump to
create hydraulic pressure which is supplied to the
rod end of the Raise Cylinder. When pressure
increases the pressure switch opens and stops
current flow to the Motor Solenoid which disrupts
power to the 12VDC Motor.
The down pressure system is protected by the DP Relief
Valve. If, while in the DP mode, a obstacle is encountered
forcing the blade up excess pressure will be created in the
rod end of the Raise Cylinder. This excess pressure is
relived to the sump by the DP Relief Valve. Once the
obstacle is cleared the plow will lower back to the surface
being plowed, lowering Raise Cylinder pressure, and the
Pressure Switch will then close re-establishing correct DP
system pressure.
The down pressure system will be over ridden when the
toggle switch is placed in raise, but will resume when
placed back into float position.
Angle Left or Right Mode Of
Operation
Electrical current is provided to the Right/Left Switch
center terminals (common) through the 9 RED/BLK wire,
any time the vehicle key switch is in the ACC or RUN
position.
The Angle Switch is a three position, momentary contact
ON-OFF-ON switch that is spring loaded to return to the
OFF position.
Operating the Angle Switch simultaneously:
• establishes a circuit allowing current to flow through
the Right/Left Switch to the Motor Solenoid primary
circuit, through the 10 BROWN wire, which activates
the Motor Solenoid. Activating the Motor Solenoid
closes the secondary contacts allowing current to
pass from the vehicle battery, through the 2B RED
wire and the 150A Circuit Breaker, to the 12VDC
Motor. The 12VDC Motor is direct coupled to the
Hydraulic Pump.
• activates either the Angle Left Solenoid, 6 GREEN
wire, or Angle Right Solenoid, 5 RED wire. The
solenoids are located on either end of the Angle
Valve Spool which is spring loaded to the center
position. When one of the solenoids is activated the
Angle Valve Spool shift directing hydraulic fluid,
under pressure, to the base end of the respective
Angle Cylinder to angle the Blade left or right.
The angle left or angle right hydraulic circuits receive
priority over the raise hydraulic circuit. If the raise circuit is
operated while angling the blade left or right, the blade will
angle left or right but will not raise until the Angle Switch
is released. Angling the blade left or right while lowering
the plow will allow the blade to angle and to lower
simultaneously because hydraulic pressure is not needed
to lower the plow.
The angle circuits are protected by two Crossover Relief
Valves set to relieve pressure at approximately 2000 PSI.
If the blade comes in contact with a obstacle during
plowing operations the Crossover Relief Valves will allow
the blade to automatically adjust its angle to clear the
obstacle.
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