Goulds Pumps 3393 - IOM - Manual (Page 112)

Troubleshooting
Symptom Cause Remedy
The temperature in the shaft sealing area The shaft seal is worn. Replace the mechanical seal.
is too high.
Check the sealing, flushing, and cooling
pipe (pressure).
Do not run the pump dry.
There are lines and rough spots on the Replace the worn parts.
shaft or shaft sleeve.
There are deposits on the mechanical
Clean the mechanical seal.
seal.
Replace the mechanical seal if neces-
sary.
Provide additional rinsing or quench.
The coupling is not aligned. Align the pump.
The temperature at the bearing is too The back pressure is too high. Open the discharge valve more.
high.
Reduce resistance in the discharge pipe.
Clean the filter if necessary.
Use a larger impeller. Make sure to note
the available motor power.
The back pressure and the discharge Throttle the discharge valve.
pressure are too low.
The speed is too high.
Reduce the speed.
Compare the speed of the motor with the
specified pump speed. See the rating
plate.
When you adjust the speed (frequency
transformer), check the reference value
setting.
The inner components are suffering from Replace the worn parts.
wear.
The forces in the pipeline are too high and Change the position of the support pipes
the pump is under strain.
and use compensators.
Check that the foundation plate and frame
are properly cast and in place.
There is either too much, too little, or the Change the lubricant.
wrong type of lubricant.
The electrical supply is not correct.
Check the voltage of all phases (2-phase
running).
Check the cable connections.
Check the fuses.
There is not enough sealing. Tighten the screws.
Replace the mechanical seal.
The bearing is damaged. Replace the bearing.
Check the lubricant and bearing space for
pollutants. Rinse the oil area.
There is not enough hydraulic thrust bal- Clean the relief holes in the impeller.
ance.
Replace the worn impeller and wear rings.
There is system-related vibration (reso- Seek assistance.
nance).
The pump is leaking. There is not enough sealing. Tighten the screws.
Replace the mechanical seal.
The discharge pressure is too high. Reduce the amount of pressure that is
carried. Throttle the control valve.
110 Model 3393 Installation, Operation, and Maintenance Manual