3
TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE
CORRECTIVE ACTION
Pump will not pump
The suction and/or discharge line(s) may be blocked, or the
valve(s) are closed, faulty and/or blocked.
Check to see that the lines and valves are in good working
order.
The end of the suction line is not submerged.
Increase its length, or move the pump closer.
Incorrect impeller rotation.
Check wiring.
Total head higher than that for which pump is designed.
Reduce total head or use a higher head pump.
Pump doesn’t catch prime
Excessive suction lift (*1).
Move the pump closer to liquid source.
Priming takes a long time
Suction line is quite long.
Refer to “start-up” under operation.
Air pockets or leaks may exist in the suction line.
Check the line for loose connections.
Pump does not perform as well
as it should
Flow is restricted due to:
Debris build-up.
Clean the lines and fi ttings.
Faulty or semi-open valve(s).
Check to see that the valves are in good working order.
Piping/hosing used is smaller than thread sizes on pump.
Increase the size of hose/pipe to reduce friction losses.
Insuffi cient submergence of the end of the suction line.
The end of the suction line must be submerged.
Excessively worn impeller (*2).
Replace impeller.
Seal is damaged (*3). Liquid will be leaking through the
middle of the adapter.
Replace seal.
Air pockets or leaks in the suction line.
Check suction line.
Clogged impeller.
Remove casing to clean out.
Pump loses prime
Liquid level drops below the end of the suction line.
Increase length of suction line or, if using fl exible hose, move
the pump closer to the source liquid.
*1)
Excessive suction lift, must take the following into consideration:
a)
Size and length of pipe
b)
Density and temperature of liquid
c)
Pipe fi ttings
d)
Elevation above sea level
Including all of the above, we recommend the total suction head not to
exceed lift.
*2)
An excessively worn impeller is mainly caused from “cavitation”. Cavitation
can be caused from a number of situations.
b) FBSTF-3 or FBSTF-5. Slide the sleeve (11) onto the shaft, and
then slide the seal onto the sleeve.
5) Screw on the impeller (2) onto the shaft. Secure the keyed end
of shaft, making sure not to damage it.
6) Replace the gasket (3).
7) Assemble the casing (1) to the transmission assembly using new
washers.
PRECAUTION:
Check to see that the impeller rotates freely in the casing.
8) Replace the couplings or belt and pulleys if necessary.
9) Realign (see alignment under installation).
10) Reconnect the piping/ housing.
Examples:
a)
Restricted suction line
b)
Excessive suction lift
*3)
The seal may be damaged due to:
a)
Normal wear
b)
Overheating
c)
Pumping chemicals for which this seal is not designed
FBSTF-1
FBSTF-2
FBSTF-3
FBSTF-5
Fig. 1
