Muncie ADVANTAGE + - Page 12

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EXPLANATION OF PLOW CIRCUIT
HYDRAULIC
PE2 – Plow Angle Directional Control Valve – PE2 has a neutral position and two actuated positions. The actuated
positions alternately switch the tank and pressure lines connected to the cylinders to provide opposing angle directions.
This valve is known as a motor spool, therefore in its normal position it blocks the pump ow from passing. However, it
allows the pressure from the counterbalance valves to drain back to tank.
Plow Angle Pilot Controls – EH1 and EH2 – Pilot pressure control valves. EH1 and EH2 are solenoid operated pilot
valves. Their purpose is to provide hydraulic pilot shifting force to move the PE2 spool that in turn provide directional
control of the plow angle. When an EH valve is energized it completes a path from the pump to the end of the PE
directional control. Two EH valves are used for each PE valve. One actuates the PE to angle left and the other actuates
the PE spool to angle right. The EH valves use very little to no ow since they are pilot controls. When the EH valves
are not energized they drain any residual pressure from the actuation ends of the PE valves.
Plow Angle Counterbalance Valves – CB1 and CB2. The plow angle counterbalance valves provide several functions.
First, they provide crossover relief or cushion control for the plow angle cylinders. They prevent the circuit from being
damaged by shock loads. At 2750 PSI, they will relieve pressure and drain to tank. In addition, they are zero leakage
valves that prevent any sort of induced backpressure to unintentionally elevate the LS pressure network. These valves
are piloted open when the directional control shifts.
CV4 and CV5 – Check Valves – These valves allow the LS signal from the plow angle circuit to be relayed back to the
RV1. However, they prevent the LS signal from back feeding. They only allow oil to travel in one direction.
Plow Raise Flow Control (SP1) – SP1 is an electrically actuated proportional two position / two way valve. During its
non-energized state, it blocks pump ow from reaching the plow lift cylinder. When energized, it provides an increasing
orice opening to ow as a result of increasing electric current to its solenoid coil. When this valve opens, it allows oil
to ow from the pump to the cap side of the cylinder.
Plow Lower Flow Control (SP6) – SP6 is an electrically actuated proportional two position / two way valve. 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 orice opening to ow as a result of increasing electric current to its solenoid coil.