English (GB)
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8. Overhaul
Check pumps running normal operation every 3000 operating
hours or at least once a year.
If the pumped liquid is very muddy or sandy, check the pump at
shorter intervals.
Check the following points:
•Power consumption
See pump nameplate.
•Motor liquid level and liquid condition
When the pump is new or after replacement of the shaft seal,
check the liquid level and water content after one week of
operation.
The motor liquid should be changed after 3000 operating
hours or once a year.
Use SML3 motor liquid, product no 96551348 (5 l).
See section 9.5 Changing the motor liquid.
•Pump parts
Check the impeller, pump housing etc. for possible wear.
Replace defective parts.
See section 9. Servicing the product for dismantling and
assembly of the pump.
•Ball bearings
Check the shaft for noisy or heavy operation by turning the
shaft by hand. Replace defective ball bearings.
See section 9. Servicing the product.
In case of defective ball bearings or poor motor function, a
complete overhaul of the pump is usually required.
This work must be carried out by Grundfos or an authorised
service centre.
•O-rings and similar parts
During service or replacement, make sure that the grooves for
O-rings and seal faces have been cleaned before the new
parts are fitted.
•Measuring the insulation resistance
Megging must take place at a voltage of minimum 500 V. The
insulation resistance measured must be minimum 50 kΩ.
9. Servicing the product
Service must be carried out by specially trained persons.
Before carrying out service, make sure that the pump has been
thoroughly flushed with clean water. Rinse the pump parts in
water after dismantling.
9.1 Servicing Grundfos pumps with explosion-proof
motors
Only Ex-approved service centres are allowed to intervene in the
flameproof enclosure of the pump. Service not affecting the
explosion protection of the pump and not violating the Ex
regulations may be carried out by service persons who are not
Ex-authorised.
Consequently, these persons are allowed to replace the following
parts of explosion-proof pumps:
• pump housing
• impeller
• seal ring and wear ring
•shaftseal.
All other service work must be carried out by an Ex-approved
service centre. Violation of this requirement will invalidate the Ex
classification of the pump.
9.2 General information
Defective bearings may reduce the Ex safety.
On Ex pumps, the ball bearings may only be
replaced by an Ex-approved service centre.
Never reuse used rubber parts.
Explosion-proof pumps must be checked by an Ex-
approved service centre once a year.
Position numbers of parts (numbers in brackets) refer
to section 17. Drawings. Position numbers of tools
(letters in brackets) refer to section 6. Service tools.
DANGER
Electric shock
Death or serious personal injury
- Before starting work on the pump, make sure that
the fuses have been removed or that the main
switch has been switched off.
Make sure that the power supply cannot be
accidentally switched on.
WARNING
Crushing of hands
Death or serious personal injury
- Make sure that all rotating parts have stopped
moving.
WARNING
Crushing hazard
Death or serious personal injury
- At all times during service, make sure to secure
the pump against rolling over, e.g. by placing a
wooden wedge on either side of the motor.
Except for replacement or dismantling of pump
housing, shaft seal, impeller, seal ring and wear ring,
all other service work must be carried out by
Grundfos or an Ex-approved service centre.
