11.1 Recommended cleaning intervals for
sensors in standard pumps
For cleaning of sensors, see section
the
sensors.
Wastewater
Wastewater
containing dry
containing
solid matter or
grease
fibres
3 months
6 months
11.2 Required cleaning intervals for
sensors in explosion-proof pumps
For cleaning of sensors, see section
the
sensors.
Wastewater
Wastewater
containing dry
containing
solid matter or
grease
fibres
3 months
6 months
11.3 Inspection
Warning
Except for service on the pump parts, all
other service work must be carried out by
Grundfos or a service workshop
authorised by Grundfos and approved for
servicing explosion-proof products.
Inspect pumps running normal operation every 3000
operating hours or at least once a year. If the dry-
solid content of the pumped liquid is very high or
sandy, check the pump at shorter intervals.
Check the following points:
•
Power consumption
See section
4.1
Nameplate.
•
Oil level and oil condition
When the pump is new or after replacement of
the shaft seal, check the oil level after one week
of operation.
Use Shell Ondina X420 oil or similar type. See
section
11.8 Oil
change.
Used oil must be disposed of in
Note
accordance with local regulations.
The table states how much oil the pumps must have
in the oil chamber:
Pump type
All types
•
Sensors
For cleaning of sensors, see section
11.6 Cleaning the
sensors.
11.6 Cleaning
Wastewater
without
grease, dry
solid matter or
fibres
12 months
11.6 Cleaning
Wastewater
without
grease, dry
solid matter or
fibres
6 months
Quantity of oil in oil
chamber [l]
0.17
•
Cable entry
Make sure that the cable entry is watertight and
that the cables are not sharply bent and/or
pinched. See section
•
Pump parts
Check the impeller, pump housing, etc. for
possible wear. Replace defective parts. See
section
11.9 Service
kits.
•
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
Grundfos or a service workshop authorised by
Grundfos.
11.4 Adjusting the impeller clearance
The SLV pumps (SuperVortex) with semi-open
impeller do not need impeller adjustment.
SL1 pumps
For position numbers, see page 550.
Proceed as follows:
1. Loosen the locking screws (pos. 188b).
2. Loosen the adjusting screws (pos. 189), and
push the wear plate (pos. 162) until it touches the
impeller.
3. Tighten the adjusting screws so that the wear
plate still touches the impeller. Then loosen all
the adjusting screws about half a turn.
Make sure the impeller can rotate freely
Caution
without touching the wear plate.
4. Tighten the locking screws.
5. Rotate the impeller by hand to check that it is not
touching the wear plate.
See also section
11.5 Cleaning the pump
Fig. 14
Pump viewed from inlet side
11.9 Service
kits.
housing.
19