Failure
Potential causes
Possible measures
3
Insufficient pressure
Insufficient pumping flow
rate
Excessive negative pressure
(not complete filling of the
pump)
Check suction line design
Viscosity too high
Provide pre-filling pump
Speed of the pump is too low
Check the pump design
During frequency inverter
operation: Check the opera-
tion/line frequency
Throttled shut-off element in
the suction line
Open the shut-off element
Suction line plugged
Clean the suction line
Suction filter plugged or too
small
Clean suction filter or use a
larger filter
Replace filter element
Suction bascet plugged or too
small
Clean intake strainer or di-
mension larger
Constant triggering of pres-
sure relief valve (if existing)
Increase valve opening pres-
sure
Pump sucks air
Check oil level in the tank
Check suction line
Check the shaft seal
Wear
Replace the device
4
Excessive operating tem-
perature
Cooling and heat dissipation
insufficient
Increase the cooling capaci-
ty
Not sufficient oil in the system Check the container layout
Excess fluid is being delivered
into the supply tank via pres-
sure relief valve under load
Check the pump design
5
Impermissible pump heat-
ing
Constant triggering of a direct-
ly attached pressure relief
valve (if existing)
Increase valve opening pres-
sure
Pressure too high in associa-
tion with a media viscosity that
is too low
Check the system design
Speed too fast in connection
with media viscosity that is too
high
Check the system design
Gland lid overtightened
(for gland seal)
Unscrew gland lid and read-
just leakage
Suction pressure too high
Reduce the pressure
Wear
Replace the device
Gear pump BT / BTH
88026290002-04 2021-02-05
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