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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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Select slower target 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. (See your John Deere dealer.)
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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. (See your John Deere dealer.)
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Booms fold too slow.
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Plugged orifice.
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Remove orifice, clean and reinstall.
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Incorrect orifice.
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Install correct orifice. (See your John Deere dealer.)
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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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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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| Symptom |
Problem |
Solution |
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All hydraulic functions but one do not work or are slow.
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Check valve stuck open in load sense line of function that works properly.
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Clean or replace check valve or (see your John Deere dealer).
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One hydraulic function fails to work properly.
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Bad fuse.
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Replace.
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Bad switch.
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Repair or replace.
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Check valve sticks shut in load sense line of hydraulic valve.
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Clean or replace check valve.
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Solenoid or hydraulic function faulty.
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Repair or replace.
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Hydraulic spool not shifting properly.
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Clean or replace or (see your John Deere dealer).
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