Troubleshooting Guide - Liquiflo MAX Series Installation, Operation And Maintenance Manual

Liquiflo Installation, Operation & Maintenance Manual
7:

Troubleshooting Guide

Problem
No discharge
Insufficient
discharge
Loss of suction
after satisfactory
operation
Excessive power
consumption
Troubleshooting Guide - Part 1
Possible Cause
Pump not primed
Wrong direction of rotation
Valves closed
Bypass valve open
Air leak in suction line
Clogged strainer
Pump worn or damaged
Suction pressure too low
Bypass valve open
Partly clogged strainer
Speed too low
Pump worn or damaged
Pump not properly primed
Air leaks in suction line
Air or vapor pockets in suction line
Increase in fluid viscosity
Fluid viscosity higher than specified
Differential pressure greater than
specified
Gear clearances insufficient for
fluid viscosity
Plastic gear clearance insufficient
for fluid temperature
Rotating parts binding or severely
worn
Max
Models M2 thru M8
Corrective Action
Verify suction pipe is submerged.
Increase suction pressure.
Open suction valve.
Reverse motor leads.
Open all suction and discharge valves.
Close bypass valve.
Tighten connections.
Apply sealant to all threads.
Verify suction pipe is submerged.
Clean strainer.
Rebuild pump.
Increase suction pressure.
Verify suction piping is not too long.
Fully open any suction valves.
Close bypass valve.
Clean strainer.
Increase driver speed, if possible.
Use larger size pump, if required.
Rebuild pump.
Reprime pump.
Tighten connections.
Apply sealant to all threads.
Verify suction pipe is submerged.
Rearrange piping as necessary.
Heat fluid to reduce viscosity.
Reduce pump speed.
Heat fluid to reduce viscosity.
Reduce pump speed.
Increase driver horsepower.
Increase pipe diameter.
Purchase gears trimmed for the correct
viscosity.
Purchase plastic gear trimmed for the
correct temperature.
Disassemble and replace worn parts.
14
®
Series Sealed Pumps