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Markers not alternating.
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Marker hoses not connected to marker valve correctly.
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Reassemble.
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Air in marker valve.
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Bleed marker hydraulic system.
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Marker valve defective.
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Replace valve. See your John Deere dealer.
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Marker lowers and disk blade is forced into ground.
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Marker cylinder is not floating in J-slot.
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Lengthen marker hydraulic hose loops.
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Marker floats off ground.
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Air in hydraulic system.
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Bleed marker lift cylinder.
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Leaking tractor SCV.
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See your John Deere dealer.
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Marker cylinder not dropping down into J-slot. (Hose loop too short.)
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Pull more hose out of frame tube and clamp.
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Alternator valve defective.
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Replace valve. See your John Deere dealer.
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