Troubleshooting | 11
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The machine does not reach
the usual pressure on the
suction connection.
Suction or discharge lines
too long or section diameter
too small.
• Use larger diameter or
shorter lines.
• Seek advice from your
local Busch representa-
tive.
The operating liquid is too
warm or insufficient operat-
ing liquid.
(the characteristic curves are
based on 15°C warm water
as operating liquid, with
higher temperatures the
achieved pressure and the
flow rate deteriorate)
• Reduce the temperature
of the operating liquid or
adjust the flow of operat-
ing liquid.
The mechanical seal leaks.
• Repair the machine (con-
tact Busch).
Partial clogging in the suc-
tion, discharge or pressure
line.
• Remove the blockage.
If an inlet screen is installed,
it can be partially clogged.
• Clean the inlet screen.
Internal parts are worn or
damaged.
• Repair the machine (con-
tact Busch).
Excessive leakage from the
gland packing.
• Tighten the packing gland
Speed low due to slippage
of the belt.
• Tighten the belt.
Heavy lime deposits in the
pump.
• Remove the lime deposit.
Leakage occurring in the
system.
• Check the joints are
sealed sufficiently.
Excessive clearance in the
pump due to corrosion or
corrosive substances in the
medium.
• Clean the medium pre-
venting solids from enter-
ing and replace the worn
parts.
Axial clearance not conform-
ing with the requirements
following a repair.
• Recalibrate the axial clear-
ance.
