Dixon ExD Series Instruction & Operation Manual page 23

Problem
Pump Not Delivering Enough
Capacity
Pump Delivering Too Much
Capacity
Impeller Rubbing On Casing/
Front Cover
Impeller Damaged
Motor Overload/Excessive
Power Consumption
Any Other Issues
Instruction & Operation Manual
Troubleshooting
Possible Cause
System head is higher than
design head
Pump is running in the wrong
direction
Speed too slow
Excessive air in fluid
Wrong impeller diameter was
selected
Product is more viscous than
initially thought
System head is lower than the
design head
Wrong impeller diameter was
selected
Shaft sleeve was not set
properly
Foreign material in pump
Cavitation
Discharge is too high
Impeller is binding
Seal is binding
System head is too low
Liquid has higher specific
gravity or is more viscous than
initially thought
Electrical supply, voltage or
frequency incorrect
Defective motor
800.789.1718
Suggested Action
Reconfigure the system as to decrease the system head.
Reverse any two leads on the motor electrical connection.
Ensure motor connections are correct and if using a VFD check
the frequency limit.
Make necessary adjustments in the system to ensure air is
removed before material reaches the pump.
Contact Dixon Sanitary.
Contact Dixon Sanitary.
Decrease the line size or use throttling valve on the pump
discharge to increase the system head.
Contact Dixon Sanitary.
Check shaft sleeve and reset to proper position as given in
the assembly section of this manual. Be sure to follow the
recommend bolt torque values for the sleeve.
Replace impeller.
Evaluate system to ensure adequate NPSHa based on the
pumps performance curve.
Contact Dixon Sanitary.
Inspect pump and check for any damage, misalignment or
interference. Replace any damaged or worn parts.
Inspect pump and replace any damaged or worn parts.
Decrease the line size or use throttling valve on the pump
discharge to increase the system head.
Contact Dixon Sanitary.
Check electrical connections and replace motor if necessary.
Contact motor manufacturer for possible warranty or repair.
Replace if needed.
Contact Dixon Sanitary.
PUMP
23