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Marker will not lower.
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Marker valve set to "Off".
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Set to "On".
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Orifice in marker cylinder plugged.
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Clean or replace orifice.
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Markers not alternating.
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Marker hoses not connected to marker valve correctly.
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Connect hoses to proper locations.
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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 or repair valve. See your John Deere dealer.
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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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Alternator valve defective.
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Replace valve. See your John Deere dealer.
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Marker cylinder orifice plugged.
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Clean or replace orifice.
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SCV metering valve set to low.
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Adjust valve.
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Leak in marker cylinder.
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Repair or replace.
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