Goulds Pumps 3420 - IOM - Manual (Page 42)

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3420 IOM 8/09
TROUBLESHOOTING
PROBLEM PROBABLE CAUSE REMEDY
No liquid delivered.
Pump not primed.
Reprime pump, check that pump and suction line are
full of liquid.
Suction line clogged. Remove obstructions.
Impeller clogged with foreign material. Back flush pump to clean impeller.
Wrong direction of rotation.
Change rotation to concur with direction
indicated by arrow on bearing housing or pump casing.
Foot valve or suction pipe opening not
submerged enough. Consult factory for proper depth. Use baffle to
eliminate vortices.
Suction lift too high. Shorten suction pipe.
Pump not producing
rated flow or head.
Air leak thru gasket. Replace gasket.
Air leak thru stuffing box / seal chamber. Replace or readjust packing/mechanical seal.
Impeller partly clogged. Back flush pump to clean impeller.
Worn wear rings. Replace defective part as required.
Insufficient suction head.
Ensure that suction line shutoff valve is fully open and
line is unobstructed.
Worn or broken impeller. Inspect and replace if necessary.
Pump starts then
stops pumping.
Improperly primed pump. Reprime pump.
Air or vapor pockets in suction line. Rearrange piping to eliminate air pockets.
Air leak in suction line. Repair (plug) leak.
Bearings run hot.
Improper alignment. Re-align pump and driver.
Improper lubrication. Check lubricant for suitability and level.
Lube cooling. Check cooling system.
Pump is noisy or
vibrates.
Improper pump/driver alignment. Align shafts.
Partly clogged impeller causing imbalance. Back-flush pump to clean impeller.
Broken or bent impeller or shaft. Replace as required.
Foundation not rigid.
Tighten hold-down bolts of pump and motor or adjust
stilts.
Worn bearings. Replace.
Suction or discharge piping not anchored or
properly supported. Anchor per Hydraulic Institute Standards Manaul
recommendations.
Pump is cavitating. Locate and correct system problem.
Excessive leakage
from stuffing box/
seal chamber.
Packing gland improperly adjusted. Tighten gland nuts.
Stuffing box improperly packed. Check packing and repack box.
Worn mechanical seal parts. Replace worn parts.
Shaft sleeve scored. Check lubrication and cooling lines.
Motor requires
excessive power.
Head lower than rating. Pumps too much liquid. Re-machine or replace as required.
Liquid heavier than expected. Check specific gravity and viscosity.
Stuffing packing too tight. Readjust packing. Replace if worn.
Rotating parts bind. Check internal wearing parts for proper clearances.