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VM 623.0004 GB/07.00 – Ident–Nr. 550 298
7 Maintenance/Repair
7.1 Maintenance
S The instructions in Section 2, Safety, must be
observed in maintenance and repair work.
S Regular monitoring and maintenance of the pump
and the drive motor are essential for optimum ser-
vice life and safety.
7.1.1 General monitoring
1. The pump must not run dry.
2. The drive motor must not be overloaded.
3. The suction and pressure pipelines must be
checked for leaks. Air must be prevented from
entering the delivery system.
4. The shaft seal must have no inadmissible leakage.
5. Changes to the normal operating data may indicate
faults. The causes must be established.
6. Installed standby pumps must be started up once a
week.
7. Any additional devices on the pump/shaft seal must
be operated and monitored in accordance with re-
gulations.
7.1.2 Maintenance of components
7.1.2.1 Bearing
The built–in groove ball bearing is maintenance–free.
The bearing is designed for a service life of approx.
24,000 hours under normal operating conditions. The
actual usable life may be lower, due to intermittent
operation, high temperature, low viscosity or the like.
The running noises and the temperature in the bearing
area must be checked at regular intervals. We recom-
mend monitoring bearings by means of shock pulse
measurements. If damage to a bearing is detected, the
bearing must be replaced.
The bearing area can become very hot.
Risk of burning if touched!
As a precautionary measure, we recommend that
the groove ball bearing is replaced every 2 years.
7.1.2.2 Shaft seal
The shaft is either sealed by mechanical seal (dry in-
stallation) or does not have a shaft seal (wet installa-
tion).
S Mechanical seal
The built–in mechanical seal is maintenance–free.
A maximum dripping rate of 10 g/h may occur during
operation and is normal. If the dripping is heavier,
the shaft seal must be replaced.
A defective shaft seal can cause uncontrolled dis-
charge of pumping liquid.
This constitutes a hazard to people (possibility of
spraying liquid) and to the environment!
7.1.2.3 Pressure–relief valve
Pressure–relief valves must be checked from time to
time, in particular after prolonged downtimes, for pas-
sage and functioning. Leaking pressure–relief valves
may cause damage to the pump. Damaged parts
should be replaced or repaired as necessary.
7.1.2.4 Coupling
The alignment of the coupling and the condition of the
flexible elements in the coupling should be checked af-
ter initial start–up and at regular intervals.
Note: Worn flexible elements must be replaced.
7.1.2.5 Drive
Refer to the operating instructions of the motor
manufacturer.
7.2 Repair
General
The system operator is responsible for ensuring that in-
struction in safety is provided. The personnel must be
made aware of all hazards that can arise in connection
with the pumped liquid or the plant.
Mounting and repair work
Trained Service fitters are available on request to carry
out mounting and repair work.
For all repairs, it must be ensured that the pump is de-
pressurised, completely drained and cool. The motor
must be protected against unintended switching on.
We must refuse acceptance of repair work on pumps
filled with fluid, for the protection of our staff and for
environmental reasons. The expenditures for disposal
with respect to the environment are to be carry by the
customer/operating company.
Hazardous substances
Where repairs are to be carried out on pumps which
have been operated with hazardous substances À
and/or environmentally harmful media, the
customer/operator must inform its own personnel on
site, or our personnel where repairs are returned to our
factory or a service workshop, without being
specifically requested to do so.
Together with the request for a Service fitter a
verification of delivery material, for example in the form
of a DIN safety data sheet, must be submitted to us.
Alternatively, you can request a certificate of safety
(form no. 448/191) from our Service department, filling
it out truthfully, correctly and in full. Send the completed
form to the center commissioned with carrying out the
repair, or hand it to our Service fitter.
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