22
Instruction & Operation Manual
800.789.1718
Troubleshooting
Dixon Sanitary ExD Series pumps are manufactured and inspected to meet sanitary standards. Occasional problems may arise.
The following guide will help determine the possible cause and offer suggestions on corrections to maximize the performance of
your pump. In case of any electric motors issues, contact the motor manufacturer directly. If you have any questions or concerns in
regards to your ExD Series pump, we encourage you to contact Dixon Sanitary.
Problem
Possible Cause
Suggested Action
Excessive Vibration/Pump Is
Noisy
Pump not level
Inspect installation of pump and level properly.
Non-supported piping
Verify piping support follows recommendations in installation
portion of this manual.
Not enough or no fluid reaching
the pump
Inspect pump to verify there is no blockage. Inspect suction line
and shorten or enlarge line size.
Insufficient NPSH (Net Positive
Suction Head) available
Increase line size and reduce number of obstructions on the
pump suction side.
Impeller and/or shaft worn
Inspect the shaft and impeller and if damaged, replace parts.
Shaft loose or bent
Inspect shaft for wear and tighten if needed. Replace shaft if
bent.
Impeller out of balance
Inspect impeller for abnormal wear. If wear or damage is
localized, replace impeller.
Foreign material in pump
Remove any foreign material causing blockage and inspect
parts for damage.
Air entrainment
Adjust system as needed to remove any air from the fluid
before it reaches the pump inlet.
Motor bearings worn
Replace motor as needed.
Rapid Seal Wear
Improper installation of
mechanical seal
See installation section of the manual. Replace any worn or
damaged parts.
Dry running
Replace damaged seals and ensure that there is always fluid in
the pump casing during operation.
Abrasive product
Contact Dixon Sanitary.
Shaft loose or bent
Inspect shaft for wear and tighten if needed. Replace shaft if
bent.
Water hammer
Correct system to prevent any quick starts or stops in fluid flow.
Improper seal selection
Contact Dixon Sanitary.
Pump Leaks
Bad connection at inlet/outlet
Inspect for missing union gaskets, loose connections or
damaged ports. Replace worn gaskets and tighten loose
connections. Repair damaged ports.
Front cover wing nuts loose
Tighten front cover wing nuts per the assembly section of this
manual.
Impeller O-ring damaged
Inspect and replace worn or damaged O-ring.
Seal not installed correctly
Reassemble seal per the assembly section of the manual.
Replace any worn or damaged parts.
Seal faces worn or damaged
Resurface or replace seals.
Pump Not Delivering Fluid
Pump not primed
Adjust system so that the pump casing is completely flooded.
Suction lift too high
Lower the level of the pump or raise the level of the supply
fluid.
Air pocket in suction line
Adjust line to eliminate formation of air pocket. Install air relief
valve on suction side of the pump.
