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Pressure gauge near zero when openers are lowered and SCV lever is held forward for a few seconds.
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Hose routing between pressure control valve and opener cylinders incorrect.
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Route hoses per hydraulic diagram-opener cylinders.
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Pressure gauge shows pressure as openers are raised.
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Hose routing between pressure control valve and opener cylinders incorrect.
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Route hoses per Hydraulic Diagram-Opener Cylinders.
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Openers rise when SCV is held forward and lower when SCV is held rearward.
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Hydraulic hoses are connected to tractor incorrectly.
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Interchange hoses in SCV coupler.
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Pressure gauge shows zero when openers are down (Closed center tractor).
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SCV lever too far forward. Valve in float position.
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Install SCV clip in proper position to hold SCV lever forward, valve open. See USING LEVER LOCK CLIP in Preparing Tractor section.
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SCV lever not far enough forward. Valve in neutral position.
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Install SCV clip in proper position to hold SCV lever forward, valve open. See USING LEVER LOCK CLIP in Preparing Tractor section.
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Pressure gauge shows zero when openers are down (Open center tractor).
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SCV lever in float position.
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Put SCV lever in neutral position.
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SCV lever not held forward long enough to charge down pressure system.
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When lowering openers, hold SCV lever forward long enough for down pressure system to reach pre-set pressure as shown by pressure gauge.
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Openers do not "float" over ondulating ground (Closed center tractor).
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SCV lever not in forward position.
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Install SCV clip in proper position to hold lever forward. See USING LEVER LOCK CLIP in Preparing Tractor section.
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| Symptom |
Problem |
Solution |
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Openers not maintaining proper ground contact (Open center tractor).
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SCV lever not held forward long enough to charge down pressure system.
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When lowering openers, hold SCV lever forward long enough for down pressure system to reach pre-set pressure as shown by pressure gauge.
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Slow internal hydraulic leakage (normal with all hydraulic systems).
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Hold SCV lever forward long enough for down pressure system to reach pre-set pressure as shown by pressure gauge.
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More hydraulic pressure required to compress opener springs.
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Increase pre-set hydraulic pressure.
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Pre-set pressure does not lower when turning valve knob counterclockwise.
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Open center attachment traps oil in system until openers are raised.
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Raise and lower openers to pre-set to lower pressure.
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Pressure valve sticks.
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Disassemble valve and clean.
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Pre-set pressure does not rise when turning valve knob clockwise.
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No pressure to adjusting valve.
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Hold SCV I in forward position for a few seconds.
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Hose couplers not connected properly to tractor.
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Ensure that hose couplers are connected to proper SCV and locked.
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No reading on gauge.
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Using open center tractor.
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Install single point system. See your John Deere dealer.
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