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Hydraulic Power Unit
The hydraulic power unit consists of:
12V DC Motor
Hydraulic pump rated at 1.12 GPM @ 1500 PSI
1.35 quart capacity reservoir
fine mesh intake and return filters
Filter screens on all outlet ports
The fluid supply line for the pump is submerged in the
hydraulic fluid reservoir and is equipped with a fine mesh
intake filter screen.
The 12V DC motor is protected electrically by a 250 amp
fuse located between the battery and the motor solenoid.
The hydraulic pump is protected by a 1750 PSI system
relief valve.
If this unit is equipped with a down pressure option, this
will allow the operator to selectively switch the system to
provide additional hydraulic force to the cutting edge of
the plow.
IMPORTANT: For proper operation, ProControl
system solenoid coils require a minimum of 10.5
volts DC, while earlier system coils require a
minimum of 9.5 volts DC. Lower voltage will cause
erratic operation, or failure to operate.
Hydraulic Controls
The hydraulic controls consist of:
• System pressure relief valve, set to 1750 PSI.
• One crossover relief valve, set to 2000 PSI.
• Two three-way two position hydraulic valves for
angle left or right functions.
• Two single acting hydraulic cylinders for angle left
and right functions.
• One three-way two position, one two-way two posi-
tion valve, and one check valve for raise and lower
function for gravity plows.
• One three-way two position, three two-way two posi-
tion valves and two check valves for raise, lower and
down pressure functions for down pressure plows.
• One down pressure relief valve for down pressure
plows.
Electro-Hydraulic Operation
All hydraulic functions are controlled by the 12V DC
electrical system which energize coils on the hydraulic
valve and the power unit motor start solenoid.
Control systems using this style controller (Figure 3-1)
when turned ON send +12V DC power to all valve coils.
Figure 3-1
ProControl and ProControl II systems (Figure 3-2) directly
apply +12V DC power to all valve coils as soon as power
is connected to the plow.
.
Figure 3-2
All systems employ ground switching to energize the
hydraulic valve coils. The individual coils are energized as
required when the control circuit board or receiver module
completes the coil circuit path to ground by means of a
signal from the wired or wireless hand-held controller in
the vehicle.
Raise Mode Of Operation
Actuating the ’Raise’ switch on the hand-held controller
sends a signal to the control circuit board on the plow,
which then actuates the motor start solenoid and the coil
for the ’C’ valve.
Actuating the start solenoid sends current to the power
unit motor to cause the power unit to pump hydraulic fluid.
Hydraulic fluid under pressure is directed through the ’C’
valve to the lift cylinder causing it to extend and raise the
plow. On down pressure plows, the ’F’ valve is also
actuated to allow fluid in the rod end of the double acting
raise cylinder to return to the reservoir.
When the ’Raise’ switch on the hand-held controller is
released, the start solenoid circuit is broken, the motor
stops, the circuit to the coil for the ’C’ valve and (if a down
pressure plow) the ’F’ valve is broken and these valves go
to their normally closed positions.
PROCONTROL
PROCONTROL II
THEORY OF OPERATION
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