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Make sure the pump casing is filled with water. |
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Look in the suction line or fittings. Check to see that all fittings are tight in the suction line and make sure there is no leak in the hose itself. |
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Mechanical seal may be worn and leaking air. |
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Inlet valve rubber may be frozen to the seat. |
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Pump may be running too slowly. |
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The clearance between the impeller and the pump body or volute may be greatly worn. Refer to manufacturer's instruction manual for proper adjustment. |
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Suction lift may be too high. At sea level the pump should not be used on lifts in excess of 25 feet from the level of the water to the center of the impeller. Keep the pump as close to the water source as is safely possible. |
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Suction line or suction strainer may be clogged. |
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Water may be too warm for the suction lift being used (as the temperature of the water increases above 60oF, the practical suction lift will decrease) making pump priming difficult. It may be necessary to replace the water in the pump case with fresh cold water. |