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All hydraulic system fails to function.
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Bad fuse.
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Replace fuse.
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Low oil supply.
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Fill system with proper oil to center of hydraulic reservoir sight tube.
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Clogged suction line.
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Clean line.
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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 center of sight tube.
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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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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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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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Low oil.
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Fill tank to proper level.
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Erratic steering.
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Hydraulic oil overheated.
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Fill tank to proper level.
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Clean oil cooler and screens.
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Pump faulty.
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Replace pump.
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All hydraulic functions but one do not work or are slow.
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Check valve in load sense line of function that works properly is stuck open.
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Clean or replace check valve or see your John Deere Dealer.
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