Maintenance And Service - Grundfos S Serie Notice D'installation Et De Fonctionnement

10. Maintenance and service

Warning
Before starting work on the pump, make sure that
the fuses have been removed or the mains switch
has been switched off. It must be ensured that the
power supply cannot be accidentally switched
on.
All rotating parts must have stopped moving.
Maintenance and service must be carried out by specially trained
persons.
Warning
The maintenance and service work on
explosion-proof pumps must be carried out by
Grundfos or a service workshop authorized by
Grundfos.
Warning
Do not open the motor in hazardous classified
location.
Warning
The explosion proof series of submersible
motors must be provided with flexible cables,
HD516, rated for extra hard usage, which are
approved by the manufacturer and suitable for
the cable entry as to diameter, number of leads,
conductor cross section and sheath material.
Before carrying out maintenance and service, make sure that the
pump has been thoroughly flushed with clean water. Rinse the
pump parts in water after dismantling.
Pumps running normal operation should be inspected every 2000
operating hours or at least once a year. If the pumped liquid is
very muddy or sandy, the pump should be inspected every 1000
operating hours or every six months.
The following points should be checked:
• Power consumption
• Oil level and oil condition
When the pump is new or after replacement of the shaft seals,
check the oil level and water content after one week of
operation. If there is more than 20 % of water in the oil, the
shaft seal may be defective. See 10.1 Oil check and oil
change.
Used oil must be disposed of in accordance with
Note
Note
local regulations.
The oil chamber contains 2 to 13.2 quarts (1.9 to 12.5 litres) of oil
depending on pump size. See table below.
Quantity of oil
S pump, Installation
range type
S
50
C-D-H
S
54
C-D-H
S
58
C-D-H
S
62
C-D-H
S
66
C-D-H
S
70
C-D-H
• Cable entry
Make sure that the cable entry is waterproof and that the
cables are not sharply bent or pinched.
• Impeller clearance
Check the impeller clearance. See 10.2 Inspection and
adjustment of impeller clearance.
• Pump parts
Check the pump housing, etc. for possible wear.
Replace defective parts.
• Ball bearings
Check the shaft for noisy or heavy operation (turn the shaft by
hand). Replace defective ball bearings.
A general overhaul of the pump is usually required in case of
defective ball bearings or poor motor function. This work must
be carried out by an authorized service workshop.
Warning
The ball bearings must be replaced at least every
25,000 operating hours.
Clean the outside of the pump at regular intervals
Caution
in order to retain the heat conductivity.
Quantity of oil
No of poles
[qt (l)]
All 2.75 (2.6)
All 2 (1.9)
All 3.7 (3.5)
All 2.7 (2.5)
All 4.9 (4.6)
All 4 (3.8)
All 9.5 (9.0)
All 7.5 (7.1)
All 13.2 (12.5)
All 9.7 (9.2)
All 13.1 (12.4)
All 9.5 (9.0)
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