11 | Troubleshooting
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0870237638_LR0110-0580A_-_IM_en
The machine runs very nois-
ily or rattles.
The operating liquid level is
too high.
• Adjust the regulating
valves to drain the pump
down to center line.
Density or viscosity of the
operating liquid too high.
• Check Operating Liquid
Settings.
• Provide a different oper-
ating liquid or a stronger
drive motor.
The machine runs in the
wrong direction.
• Check the direction of ro-
tation, see
.
Defective bearings.
• Repair the machine (con-
tact Busch).
The vacuum pump cavitates
(periodic formation and col-
lapsing of steam bubbles in
the operating liquid).
• Consult the chapter
.
• Adjust cooling liquid flow
rate to reduce the tem-
perature of the operation
liquid.
Worn coupling element.
• Check the coupling and
repair it if necessary.
Belts loose.
• Tighten the belts.
Suction and discharge piping
is too thin.
• Use thicker piping.
The machine runs too hot.
Insufficient air ventilation.
• Make sure that the cool-
ing of the machine is not
impeded by dust/dirt.
• Clean the fan cowling,
the fan, the ventilation
grille and the cooling fins
of the motor.
Ambient temperature too
high.
• Observe the permitted
ambient temperature, see
Temperature of the process
gases at the inlet too high.
• Observe the permitted
gas inlet temperature, see
Insufficient gas transfer.
• Introduce a suitable inert
gas or air via the anti-
cavitation connection.
Partial blockage in the suc-
tion, discharge or pressure
line.
• Remove the blockage.
