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10. Leaking around throat packing nut which may indicate worn or damaged packings. 10. Replace packings; see pump manual. Also check piston valve seat for hardened paint or nicks and replace if necessary. Tighten packing nut/wet-cup. 11. Pump rod damage 11. Repair pump. See pump manual 310643 or 310894. 12. Low stall pressure 12. Turn pressure knob fully clockwise. Make sure pressure control knob is properly installed to allow full clockwise position. If problem persists, replace pressure transd