1.1 Drive rotation in wrong
direction
1.2 Oil level in the tank is too
low or the suction pipe is too
short
1.3 Suction pipe blocked
1.4 Pump cannot vent
because the pressure pipe is
under pressure or is closed
due the valve
1.5 Under pressure in the
suction pipe is too great due
to high flow resistance
1.6 Viscosity of the pressure
medium too high
1.7 Suction pipe leaking
Reverse the direction of rotation
and mark it.
Top up oil or lengthen suction pipe
Remove blockage
Provide unobstructed venting,
open the pressure pipe and, if
necessary, check whether the
valves have been correctly
installed
If necessary, clean existing
suction filter, increase the bore of
the pipe, straighten the suction
pipe, reduce the suction hight.
Use another pressure medium
(adjust the viscosity to that wich is
appropriate for the operating
temperature and temperature of
the environment
Seal the connection thread,
tighten screwed connections and
flanges
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