BE6100
Edition 08/2018
Page 10 of 13
9
Trouble shooter’s guide
Fault
Possible causes
Remedy
Pump does not pump Incorrect direction of rotation of pump
Reverse direction of rotation of motor.
Pump is operating without fluid
Add pumping fluid; raise fluid level in tank.
Shut-off valves are closed
Open valves
All fluid is pumped through a bypass
line
Check bypass lines and relief valve settings.
Broken pressure relief valve
Replace pressure relief valve, check pressure.
Pump is blocked
Exchange pump immediately. Do not turn the motor
on again!
Send the pump to the manufacturer to be repaired.
Pump does not de-
aerate
No possibility for de-aeration provided
Install air relief valve in the discharge line or start up
pump with de-energized relief valve.
Pump does not ope-
rate at full capacity
Suction line is leaking
Tighten the flange screw fittings and replace seals.
A bypass is in open
Check the piping and correct the bypass / leakage.
Suction pipe too close to tank bottom
Use Brinkmann suction protector; shorten suction
pipe; cut suction pipe at 45 degree angle
Upstream or downstream filters
clogged
Clean or replace filter.
The pump is worn out
If necessary, improve the filtration. If you are familiar
with the equipment, exchange the spindle set.
Otherwise, send the pump to the manufacturer.
Pump is operating
loudly
Suction line is leaking; pump is draw-
ing air
Tighten fittings and pipe connections; replace seals
or gaskets in suction line if necessary.
The suction height is greater than
1.2 m and/or the total input pressure is
< 0.8 bar.
Raise fluid level in tank or lower pump.
Pump is cavitating because the
temperature of the pumped liquid is
too high.
Increase the supply or inlet pressure.
Lower the temperatur of the pumped liquid.
Consult with the manufacturer.
System pressure is too low
Check the size of the primary pressure pump.
Incorrect opening and closing se-
quence of the suction side valves
Correct the valve opening sequence so that the
pump only starts when the valve is open. Only close
the valve when the pump no longer rotates. In
general, avoid suction side valves.
Air pockets or air entrainment in the
pumped medium or pump sucks air.
Ensure that air is discharged better in the container.
Check the proper seal/connection of the suction pipe.
Resistance in suction line too high
Increase suction pipe diameter; check for restrictions
(elbows etc.)
Suction pipe too close to tank bottom
Use Brinkmann suction protector; shorten suction
pipe; cut suction pipe at 45 degree angle
Fluid viscosity too high
Feed screw pump by secondary feed pump after
consulting with the manufacturer
The pump is worn out
If necessary, improve the filtration. If you are familiar
with the equipment, exchange the spindle set.
Otherwise, send the pump to the manufacturer.
Upstream or downstream filters
clogged
Clean or replace filter
Auxiliary equipment causes noises
Noises can also arise as a result of defective pres-
sure relief valves, an unfavourable path taken by the
pipework or a lack of ventilation. Establish the source
of the noise and eliminate the root cause.
Inline pump is leaking The ring seal is worn out or soiled
Otherwise, send the pump to the manufacturer in
order for it to be repaired. Check the equipment for
hydraulic shock and suction side negative pressure
when switching. If necessary, improve the filtration.
: Will result in immediate pump damage or hazards
