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EXPLANATION OF PLOW DOWN CIRCUIT
HYDRAULIC
Plow Down Relief – The TS2 valve is a two position / three way proportional pressure valve. It serves multiple functions.
In its non-energized state, it provides a constant 100 PSI of down force on the rod side of the cylinder. When the plow
is raising, the oil from the rod side of the cylinder is drained back through this valve.
This valve is energized when lowering a DA cylinder. Its purpose is to provide an adjustable pressure to the rod-side of
the cylinder. The pressure setting of this valve is adjustable as a function of electrical current.
RV5 – Upside Pressure Relief – This is an adjustable relief valve that protects the cap side of the plow cylinder. This
is set at the factory at 2000 PSI. The valve will only open if the pressure at the cylinder reaches 2000 PSI.
CV1 – Load Holding Check – The purpose of CV1 is to hold the plow in the up position after oil has passed through the
SP1 cartridge. It will not allow oil to back feedback through the SP1.
CV3 & CV2 – CV3 and CV2 are back-to-back check valves. Their purpose is to communicate load sense pressures of
the plow circuit back to the RV1 boost pressure relief.
EXPLANATION OF PLOW DOWN CIRCUIT
SP4 – Hoist Raise Flow Control – SP4 is an electrically actuated proportional two position / two way valve. During its
non-energized state, it blocks pump ow from reaching the hoist cylinder. When energized, it provides an increasing
orice opening to ow as a result of increasing electric current to its solenoid coil. Its function is to raise the hoist. When
this valve opens, it allows oil to ow from the pump to the cap side of the cylinder.
SP5 – Hoist Lower Flow Control – SP5 is an electrically actuated proportional two position / two way valve. Its
function is to lower the hoist. During its non-energized state, it blocks the oil from draining from the cap end of the
cylinder back to tank. When energized, it provides an increasing orice opening to ow as a result of increasing electric
current to its solenoid coil.
RV4 - Upside Hoist Pressure Relief – This is an adjustable relief valve that protects the cap side of the Hoist cylinder.
This is set at the factory at 2500 PSI. The only time it will allow oil to drain back to tank is if the pressure reaches
2500 PSI.
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