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5.6 Hydraulic Coulter adjustment
The hydraulic coulters run using a constant oil supply from the tractor. The pressure in the system is
regulated using a pressure relief valve located near the fan. The pressure gauge fitted to the valve displays
the working pressure. About 10 L/min (or approx 20%) of oil will be required to allow the coulters to
respond to changing ground conditions. If coulters don’t respond fast enough increase the oil flow.
The default pressure is 30bar. This pressure will need to be adjusted according to local conditions. For
example it will need to be increase as the leg is set to work deeper. Soil types, stone concentrations and
desired firming will all influence the pressure setting. The pressure should not be set so high that the
transport wheels are lifted off the ground.
Pressure too high
Pressure too low
Working pressure
between 5 and 35bar
Pressure correct
Coulter Pressure
Adjustment Valve
