Fisher 3590 Valve Positioner Manual -

| Symptom | Likely Cause | Fix | | :--- | :--- | :--- | | | No supply pressure / Blocked restriction orifice | Check supply at "S" port. Clean the internal fixed restriction. | | Hunting (Oscillation) | Loose linkage / Too much friction | Tighten all feedback arm bolts. Check valve packing gland torque. | | Slow response | Low supply pressure / Dirty pilot valve | Increase supply to 60+ psig. Remove and clean the pilot valve block with isopropyl alcohol. | | High air consumption | Worn pilot seat / Leaking gasket | Rebuild the pilot valve assembly (Kit # 3590-PILOT). | | Deadband is too high | Worn cam follower | Replace the cam follower bearing (Part # 3A9871). |

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Contact your local Emerson/Fisher distributor or leave a comment below with your valve model. Call to Action (CTA): Download our free Fisher 3590 Calibration Checklist (PDF) by clicking the link below. | Symptom | Likely Cause | Fix |