23
10. Fault finding chart
Warning
Before any servicing of the pump, make sure that the pump unit cannot accidentally start.
Fault
Cause
Remedy
1.
Pump delivers no or
too little water.
a) Air in suction pipe.
Fill storage container with water. Vent pump. Make sure
the suction pipe has been installed according to section
b) Pump draws in air due to defective gaskets.
Check the pipeline gaskets and pump housing gaskets,
and replace if necessary.
c) Counter-pressure too high.
Check the system for impurities and blockages.
d) Inlet pressure too low.
Make sure that the storage tank is filled with enough
water and that the conditions in section
are complied with.
e) Suction pipe or impeller blocked.
Clean suction pipe and pump.
2.
Pump makes
strange noises and/
or runs unevenly.
a) Inlet pressure too low (cavitation).
Make sure that the storage tank is filled with enough
water and that the conditions in section
are complied with.
b) Air in suction pipe.
Refill the storage tank with water. Vent pump. Make sure
the suction pipe has been installed according to section
c) Impeller off-balance.
Clean the impeller and remove foreign particles.
d) Inner parts worn.
Replace defective parts.
e) Pump stressed by the pipework.
Mount the pump so that it is not stressed. Support the
pipes.
f)
Defective bearings.
Replace bearings.
g) Defective coupling.
Replace coupling.
h) Foreign bodies in the pump.
Clean the pump and remove foreign bodies.
3.
Leakage in pump
housing.
a) Pump stressed by the pipework.
Mount the pump so that it is not stressed. Support the
pipes.
b) Pump housing gaskets or gasket at
connections defective.
Replace defective gaskets.
4.
Leakage in the shaft
seal.
a) Mechanical shaft seal dirty or stuck together.
Check and clean the mechanical shaft seal.
b) Mechanical shaft seal defective.
Replace the mechanical shaft seal.
c) Shaft surface or shaft sleeve defective.
Replace the shaft or the shaft sleeve.
5.
Too high pump
temperature.
a) Air in the pump.
Fill the storage tank with water. Vent pump.
b) Inlet pressure too low.
Make sure that the storage tank contains enough water
and that all conditions in section
c) Bearings lubricated with too little, too much or
unsuitable lubricant.
Replenish, reduce or replace the lubricant.
d) Pump with bearing seat stressed by pipework. Mount the pump so that it is not stressed. Support the
pipes. Check the alignment of the pump, and correct, if
necessary. See section
5.1.9 Aligning pump and engine
.
e) Axial pressure too high.
Check the relief holes of the impeller and the lock rings
on the suction side.
6.
Engine does not
start.
a) Fuel tap closed.
Open fuel tap on the diesel tank.
b) No diesel in the tank.
Re-fill tank with diesel. Vent fuel system. See sections
and
.
c) Fuel filter blocked.
Change fuel filter. See section
.
d) Air in fuel system.
Vent fuel system.
e) Water in the fuel.
Drain fuel from the fuel tank. Re-fill with new fuel.
Vent fuel system.
f)
Starter relay defective.
Replace starter relay.
g) Insufficient power supply.
Check power supply to the control cabinet, batteries and
cables on the pump unit.
h) Exhaust pipes blocked.
Remove foreign bodies from exhaust pipes.
7.
Oil pressure is too
high or too low when
engine is running.
a) Oil filter blocked.
Replace oil filter. See section
.
b) Water or fuel in the oil.
Change oil. See section
.
c) Oil level too low/too high.
Refill oil. See section
. Drain oil.
See section
.
d) Oil pump worn.
Replace oil pump.
