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6.2. Maintenance schedule
Every six months:
• Visual inspection of the power supply leads
• Visual inspection of the cable holders and the wiring
• Visual inspection of accessories, such as for example
suspension device, lifting devices, etc.
6.3. Maintenance work
Visual inspection of the power supply leads
The power inlet leads must be inspected for bubbles,
cracks, scratches, scour marks and/or crushing zones.
If damages are detected, the damaged power inlet lead
must be replaced immediately.
The leads may only be replaced by the manufacturer
or an authorized/certified service workshop. The ma-
chinery must only be started after appropriate repair
of the damage!
Visual inspection of the cable holders (biners) and the
wiring (traction cable)
If the machine is used in basins/shafts the hoisting wires/
cable holders (biners) and the wiring are subject to con-
stant wear and tear. Regular inspections are required to
prevent a complete wear and tear of the hoisting wires/
cable holders (biners) and/or wiring and a complete dam-
age to the power cable.
The hoisting wires/cable holders (biners) and the wir-
ing must be replaced immediately if there are slight
signs of tear and wear!
Visual inspection of accessories
The accessories, such as for example suspension devic-
es, lifting devices, etc. must be checked for correct fitting.
Loose or defective accessories must be repaired/replaced
immediately.
7. Repairs
7.1. General
The following repairs can be carried out on this machine:
• Changing the impeller and pump unit
• Changing wear rings
When carrying out repair work, the following information
should always be noted:
• Round sealing rings as well as existing seals should
always be replaced.
• Screw fixings such as spring washers should always
be replaced.
• The correct torques must be observed.
In general, the following applies to repairs:
Switch off the machine, disconnect it from the mains
(have this done by an electrician), clean it and place
it on a solid base in a horizontal position. Secure it
from falling over and/or slipping.
If not otherwise stated, the torque values of the
below tables should be used. Values stated are for clean,
lubricated screws. Fixing torque [Nm] for screws A2/A4
(Coefficient of friction = 0,2)
A2/A4,
Hardeness class 70
A2/A4,
Hardeness class 80
DIN912/DIN933
DIN912/DIN933
M6
7 Nm
11,8 Nm
M8
17 Nm
28,7 Nm
M10
33 Nm
58 Nm
M12
57 Nm
100 Nm
M16
140 Nm
245 Nm
M20
273 Nm
494 Nm
7.2. Changing the impeller and pump unit
Changing the impeller and the pump unit.
• Loosen and remove the screws on the sealing
housing.
• Secure and remove the pump housing from the
sealing housing with suitable equipment, e.g.
hoisting gear. Place on a secure base.
• Fasten the impeller with suitable equipment, loosen
and remove the impeller fastening (cylindrical screw
with socket hex).
Pay attention to the locking screw!
• Remove the impeller from the shaft using a suitable
extractor.
• Cleaning the shaft
• Attach a new impeller to the shaft.
