KM 251 en
48 15.720148-V1.0
10 Possible Errors
Caution
Actions that are taken to overcome faults on the pump and which are not described
in the operation manual, must only be carried out by the service centre!
Fault Diagnosis Cause Remedy
No dosing flow even
at a low
backpressure. (Pump
is running without any
noise).
No motor sound or vibrations,
Ventilator is not rotating.
Motor is not running.
Connect at power supply,
exchange motor if blown.
When the aeration screw is
removed, use the oil-level gauge
(F) to observe a calm oil surface,
there is no “sloshing”.
Motor runs, but the eccentric
shaft is not rotating, no piston
movement; spiral pin or motor
shaft broken.
Dismantle the motor and eccentric
shaft, replace damaged parts.
Oil level too low - see oil-level
gauge (F). No reaction of the
overpressure valve, if the suction
line is closed.
Not enough oil in the pump,
air is penetrating the piston
flange through the control
holes.
Fill in oil, deaerate the pump,
see “Start-up”.
No dosing flow at the pressure
side
Dosing head is not filled,
suction line empty, tank empty
Deaerate dosing head, fill/
exchange (tank) at suction side
No dosing flow even
at a low
backpressure.
(pump is running
noisily, although the
overpressure valve
reacted).
Overpressure valve reacts
independent from the dosing flow
adjustment (10%-100%).
Valve at pressure side closed. Open valve.
Backpressure is higher than
the adjusted pressure at the
overpressure valve.
Adjust overpressure valve higher,
but only if the pump is designed
for this. Never block the
overpressure valve.
Pressure valve is installed in
the opposite direction of the
flow, observe the arrow at the
valve.
Install pressure valve correctly.
AMS responds, overpressure
valve reacts independent from the
dosing flow adjustment (10%-
100%).
Valve at suction side closed. Open valve.
Suction filter obstructed. Clean suction filter, replace.
Suction valve jammed (does
not open).
Dismantle and check suction
valve.
Suction valve has a too strong
spring.
Use fitting spring, or use double
ball valve for checking.
Suction valve is installed in
the opposite direction of the
flow, observe the arrow at the
valve.
Install suction valve correctly.
AMS responds, overpressure
valve reacts at 100% dosing flow,
when reducing the flow ~10%-
20% the overpressure valve does
not react any more.
Dosing head is not completely
deaerated.
Fill dosing head completely.
Pump is running in cavitation
(dosing liquid with too high
viscosity; dosing liquid with
too high steam pressure at
Operating temperature =
degassing of the liquid;
suction height too high; wrong
design of the system at
suction side).
Use a gear with a low stroke
number; use valves with bigger
nominal width; realise admission
pressure on suction side.
Diaphragm broken (not
enough oil in the enclosure of
the pump; piston flange).
Clean and grease well all parts
using oil according to regulations,
then install new diaphragm.
Pump does not deliver
or pressure relief
valve opens.
Pressure valve of pump is
clogged or ball guide in the
valve is worn due to corrosive
or abrasive media.
Uninstall pressure valve,
dismantle and clean, or if the bars
of the ball guide are worn, replace
valve.
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