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problemprobable causeremedy
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no liquid deliveredpump not primedreprime pump, check that pump and suction line are full of liquid
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suction line cloggedremove obstructions
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impeller clogged with foreign materialback flush pump to clean impeller
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wrong direction of rotationchange rotation to concur with direction indicated by arrow on bearing housing or pump casing
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foot valve or suction pipe opening not submerged enoughconsult factory for proper depth. Use baffler to eliminate vortices
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suction lift too highshorten suction pipe
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pump not producing rated flow or headair leak through gasketreplace gasket
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air leak through stuffing boxreplace or readjust packing/mechanical seal
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impeller partly cloggedback flush pump to clean impeller
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worn suction sideplate or wear ringsreplace defective part as required
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insufficient suction headensure that suction line shutoff valve is fully open and line is unobstructed
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worn or broken impellerinspect and replace if necessary
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pump starts then stops pumpingimproperly primed pumpreprime pump, check that pump and suction line are full of liquid
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air or vapor pockets in suction linerearrange piping to eliminate air pockets
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air leak in suction linerepair (plug) leak
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bearings run hotimproper alignmentrealign pump and drive
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improper lubricationcheck lubricate for suitability and level
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lube coolingcheck cooling system
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pump is noisy or vibratesimproper pump/driver alignmentalign shafts
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partly clogged impeller causing imbalanceback flush pump to clean impeller
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broken or bent impeller or shaftreplace as required
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foundation not rigidtighten hold down bolts of pump and motor or adjust stilts
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worn bearingsreplace as required
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suction or discharge piping not anchored or properly supportedanchor per Hydraulic Institute Standards Manual recommendation
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pump is cavitatingsystem problem
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excessive leakage from stuffing box/seal chamberpacking gland improperly adjustedtighten gland nuts
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stuffing box improperly packedcheck packing and repack box
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worn mechanical seal partsreplace worn parts
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overheating mechanical sealcheck lubrication and cooling lines
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shaft sleeve scoredremachine or replace as required
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motor requires excessive powerhead lower than rating, pumps too much liquidconsult factory. Install throttle valve, trim impeller diameter
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liquid heavier than expectedcheck specific gravity and viscosity
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stuffing packing too tightreadjust packing. Replace if worn
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rotating parts bindcheck internal wearing parts for proper clearances
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