E
n
g
lis
h
(G
B)
(clogged
impeller
blades).
Clean
and
check
the
impeller.
wrong
type
of
grease.
Add,
remove
or
replace
grease.
Open
the
isolating
valve
on
the
suction
side.
wrong
type
of
grease.
Add,
remove
or
replace
grease.
13.
Fault
finding
Warning
Before
removing
the
terminal
box
cover
and
carrying
out
any
work
on
the
pump,
make
sure
that
the
power
supply
has
been
switched
of
and
that
it
cannot
be
accidentally
switched
on.
Drain
the
pump.
Fault
Cause
Remedy
1.
Pump
does
not
pump,
pump
performance
is
poor,
or
pump
does
not
suck.
2.
Motor-protective
a)
Incorrect
electrical
connection.
Check
the
electrical
connection
and
correct,
if
necessary.
b)
Incorrect
direction
of
rotation.
Interchange
two
phases.
c)
Too
little
liquid
in
the
pump
housing.
Vent
and
fill
the
suction
pipe
and
pump.
d)
Air
cannot
escape.
Discharge
pipe
clogged.
Open
all
valves.
e)
Suction
head
too
large.*
Increase
the
liquid
level
on
the
suction
side.
Open
the
isolating
valve
on
the
suction
side.
f)
Pipes
clogged
or
foreign
body
in
the
impeller.
Open
the
pump
and
remove
blockage.
g)
Air
sucked
in
through
a
defective
seal.
Inspect
pipe
seals,
pump
housing
seals
and
shaft
seals.
Replace
defective
seals.
h)
Pump
sucks
air
because
of
too
little
liquid.
Increase
the
liquid
level
on
the
suction
side
and
keep
it
as
constant
as
possible.
a)
Pump
blocked.
Open
the
pump
and
remove
the
blockage.
circuit
breaker
trips.
Motor
is
overloaded.
b)
Pump
cannot
run
as
the
pump
housing
is
stressed
by
the
pipework.
c)
The
density
or
viscosity
of
the
pumped
liquid
is
higher
than
that
stated
in
the
order.*
d)
Motor-protective
circuit
breaker
not
correctly
set.
e)
Motor
running
on
two
phases
of
three-phase
supply.
Install
the
pump
so
that
it
is
not
stressed
by
the
pipework.
Support
the
pipes.
If
a
lower
performance
than
that
given
is
sufficient,
throttle
the
flow
on
the
suction
side.
If
not,
use
a
larger
motor.
Check
the
setting.
Replace
the
motor-protective
circuit
breaker,
if
defective.
Check
the
electrical
connection.
Replace
the
fuse,
if
defective.
3.
Pump
too
noisy.
Pump
does
not
run
a)
Suction
head
too
large.*
Increase
the
liquid
level
on
the
suction
side.
Completely
open
the
isolating
valve
on
the
suction
side.
smoothly
and
vibrates.
b)
Air
in
the
suction
pipe
or
pump.
Vent
and
fill
the
suction
pipe
and
pump.
c)
Pump
sucks
air
because
of
too
little
liquid.
Increase
the
liquid
level
on
the
suction
side
and
keep
it
as
constant
as
possible.
d)
Impeller
is
out
of
balance
e)
Internal
parts
are
worn.
Replace
defective
parts.
f)
Pump
stressed
by
the
pipework
(causing
starting
noise).
Install
the
pump
so
that
it
is
not
stressed
by
the
pipework.
Support
the
pipes.
g)
Defective
bearings.
Replace
bearings.
h)
Bearings
greased
with
too
little,
too
much
or
i)
Motor
fan
defective.
Replace
the
fan.
j)
Rubber
element
of
coupling
(power
transmission)
defective.
Replace
the
rubber
element
and
realign
the
coupling.
See
section
k)
Foreign
body
in
the
pump.
Open
and
clean
the
pump.
4.
Pump
or
connections
leaking.
Shaft
seal
or
a)
Pump
is
stressed
by
the
pipework
(causing
leaking
pump
housing
or
connections).
Install
the
pump
so
that
it
is
not
stressed.
Support
the
pipes.
stuffing
box
is
leaking.
b)
Housing
seal
and
connection
seals
defective.
Replace
seals.
c)
Shaft
seal
dirty
or
stuck.
Check
and
clean
the
seal.
d)
Shaft
seal
worn.
Replace
the
seal.
5.
Overtemperature
of
a)
Air
in
the
suction
pipe
or
pump.
Vent
and
fill
the
suction
pipe
and
pump.
pump,
bearing
bracket
b)
Suction
head
too
large.
Increase
the
liquid
level
on
the
suction
side.
or
motor.
c)
Bearings
greased
with
too
little,
too
much
or
d)
Pump
with
bearing
bracket
is
stressed
by
the
pipework.
e)
Motor-protective
circuit
breaker
defective
or
not
correctly
set.
*
Contact
the
manufacturer.
10
Install
the
pump
so
that
it
is
not
stressed.
Support
the
pipes.
Check
the
alignment
of
the
coupling.
Check
the
setting.
Replace
the
motor-protective
circuit
breaker,
if
necessary.
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