Troubleshooting - Franklin Electric FBSTF Series Owner's Manual

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.
PROBLEM
Pump will not pump
Pump doesn't catch prime
Priming takes a long time
Pump does not perform as well
as it should
Pump loses prime
*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.

TROUBLESHOOTING

PROBABLE CAUSE
The suction and/or discharge line(s) may be blocked, or the
valve(s) are closed, faulty and/or blocked.
The end of the suction line is not submerged.
Incorrect impeller rotation.
Total head higher than that for which pump is designed.
Excessive suction lift (*1).
Suction line is quite long.
Air pockets or leaks may exist in the suction line.
Flow is restricted due to:
Debris build-up.
Faulty or semi-open valve(s).
Piping/hosing used is smaller than thread sizes on pump.
Insuffi cient submergence of the end of the suction line.
Excessively worn impeller (*2).
Seal is damaged (*3). Liquid will be leaking through the
middle of the adapter.
Air pockets or leaks in the suction line.
Clogged impeller.
Liquid level drops below the end of the suction line.
Fig. 1
Check to see that the lines and valves are in good working
order.
Increase its length, or move the pump closer.
Check wiring.
Reduce total head or use a higher head pump.
Move the pump closer to liquid source.
Refer to "start-up" under operation.
Check the line for loose connections.
Clean the lines and fi ttings.
Check to see that the valves are in good working order.
Increase the size of hose/pipe to reduce friction losses.
The end of the suction line must be submerged.
Replace impeller.
Replace seal.
Check suction line.
Remove casing to clean out.
Increase length of suction line or, if using fl exible hose, move
the pump closer to the source liquid.
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
3
FBSTF-1
FBSTF-2
FBSTF-3
FBSTF-5
CORRECTIVE ACTION