Liquiflo
Installation, Operation & Maintenance Manual
Max
®
Series Sealed Pumps
Models M2 thru M8
Troubleshooting Guide - Part 2
Problem
Possible Cause
Corrective Action
Abrasives in fluid
Install suction strainer.
Limit solids concentration.
Reduce pump speed or use larger pump
running at lower speed.
Corrosion wear
Use materials of construction that are
acceptable for fluid being pumped.
Extended dry running
Install power sensor to stop pump.
Rapid pump wear
Discharge pressure too high
Increase pipe diameter.
Decrease pipe run.
Suction and/or discharge piping not
anchored or properly supported
Anchor per Hydraulic Institute Standards.
Base not rigid enough
Tighten hold-down bolts on pump and
motor or adjust stilts.
Inspect grout and regrout if necessary.
Worn pump bearings
Replace bearings.
Worn motor bearings
Replace bearings or motor.
Excessive noise
and vibration
Pump cavitation
Increase NPSH available.
Static seal failure caused by
chemical incompatibility or thermal
breakdown
Use O-rings or gaskets made of material
compatible with fluid and temperature of
the application.
Static seal failure caused by
improper installation
Install O-rings or gaskets without twisting
or bending.
Use star-pattern torque sequence on
housing bolts during assembly.
Allow Teflon O-rings to cold flow and
seat during tightening.
Torque bolts to specification.
Mechanical seal worn or damaged
Disassemble and replace mechanical seal.
Prime pump and avoid dry running.
Pump port connections not properly
sealed
Use Teflon tape or other suitable sealant.
Use gaskets compatible with fluid and
temperature of the application.
Excessive product
leakage
Crevice corrosion of pump housing
material
Only pump chemical fluids that are
compatible with the pump housing
material.
Decrease temperature to reduce corrosion
rate to acceptable value.
Flush idle pumps that are used to pump
corrosive chemicals, such as acids and
caustics.
Eliminate contaminants in the fluid that
can accelerate corrosion wear.
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