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Hydraulic system fails to function.
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Low oil supply.
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Fill system with proper oil to sight glass.
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Plugged suction line.
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Clean line.
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Faulty relief valve.
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See your John Deere dealer.
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Faulty unloader valve.
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See your John Deere dealer.
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Damaged pump drive coupling.
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Replace coupling.
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Pump faulty.
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Replace pump.
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Oil escapes at reservoir breather.
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Reservoir over-filled.
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Reduce oil to full level (cylinders retracted).
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Excessive speed on rough terrain.
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Reduce speed.
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Booms level or fold too fast.
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Excessive chamfer or burr on fitting.
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Use good, correct fittings and orifices, properly installed.
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Incorrect orifice, or none in work port.
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Use correct orifices, properly installed.
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Lift arms drop too fast.
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Incorrect orifice, or none in work port.
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Use correct orifices, properly installed.
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Some functions work erratically or not at all.
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Low oil.
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Fill tank to proper level.
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Loose or disconnected wires at switch or solenoid.
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Check and repair connections.
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Failed solenoid coil.
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Replace coil.
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