Version of April 2009
Page 14 of 16
5. Operating troubles, causes and remedial action
No.
Operating troubles
Causes and remedial
action
Pump
does
not
start
Pump
does
not
prime
Delivery
is not
ob-
tained
or
reduced
Pressure
head is
not
obtained
Irreg-
ular
pump
delivery
Pump
oper-
ates
noisily
Pump
is
leaky
Motor
gets
too
warm
Display
show
Error
code
5.1 5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
The 4-piston diaphragm pump
operates trouble-free at any time
provided they are applied according to
the operating conditions mentioned in
this manual.
If you have any questions, please
contact Quattroflow.
1
X
X
The screws of the pump-chamber
maybe not tightened enough. Fix it!
2
X
Check the direction of flow showed by
the arrow on the pump, in case of
wrong way, turn the pump head
3
X
X
X
Check suction pipeline and TC- seals
for tightness
4
X
X
X
X
Check suction head-increase suction
line cross section.
5
X
X
X
Check viscosity of liquid pumped.
6
X
Check pump speed. Control speed of
drive motor. Check voltage and
frequency
7
X
X
X
Avoid air inclusions in the liquid to be
pumped
8
X
X
Check pressure head-open valve in
discharge line completely, remove
obstruction in discharge line
9
X
Pressure line completely or partly
clogged Diaphragm maybe broken
Change diaphragm!
10
X
The diameter of the pipes in suction
or pressure line are to small
11
X
Check the coupling halves. They must
be fixed with at least 2-3mm space.
12
X
Check longitudinal play of coupling rod
pins. The spider might be worn.
13
X
X
X
Check whether foreign bodies in pump.
Disassemble pump, remove foreign
bodies, replace defective parts
14 X
X
Pump stopped by the Thermistor
switch. Please allow the motor to cool
down – please reduce the power
consumption.
15 X
X
Bearings are worn or defective.
Disassemble pump, replace the shaft –
bearing unit
16
X
The valves are dry (i.e. not in use for a
long time), deformed or worn. Change
valve or wet the pump.
17
X
The diaphragm is burst ( the discharge
pressure was too high) - replace it with
PSKITQ20k
18
X
X
X
X
O – rings between valve plate and
pump housing are defective - replace
it with PSKITQ4k
19
X
Align coupling accurately
20
X
X
The clamping ring screw got loose – fix
it! See 4.2 Mount the pump chamber
(picture 2 )
