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Combine Will Not Move When 4-Wheel Drive Is Engaged.
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One or both rear wheels in spin-out condition.
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Increase hydrostatic pump flow by moving hydrostatic control lever forward.
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Bad electrical control switch on console.
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See your John Deere dealer
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Bad solenoid valve on control valve.
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See your John Deere dealer.
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Spool will not move in control valve.
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See your John Deere dealer.
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Combine Will Not Move When 4-Wheel Drive Is Disengaged.
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Faulty line or connection between main system and rear wheel drive control valve.
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Repair or replace parts as needed.
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4-Wheel Drive Will Not Disengage.
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Bad electrical control switch on console.
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See Your John Deere dealer
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Bad solenoid valve on control valve.
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See your John Deere dealer.
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Spool will not work in control valve.
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See your John Deere dealer.
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Rear Wheels Wander During Transport Speeds.
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Toe-in out of adjustment.
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Adjust toe-in.
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