En
gl
is
h (
G
B)
14
3. If connected correctly, the pump will jerk in the
opposite direction of the direction of rotation.
See fig. 10.
4. If the direction of rotation is wrong, interchange
two phases. See fig. 4 or 5.
Fig. 10
Jerk direction
10. Maintenance and service
Flush the pump thoroughly with clean water before
maintenance and service. Rinse the pump parts in
water after dismantling.
10.1 Yearly maintenance
Pumps running normal operation should be checked
every 3000 operating hours or at least once a year.
If he dry solids content of the pumped liquid is very
high or sandy, check the pump at shorter intervals.
Check the following points:
•
Power consumption
.
•
Motor 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 sections
•
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
•
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.
•
Grinder system/parts
In case of frequent choke-ups, check the grinder
system for wear. When worn, the edges of the
grinding parts are round and worn. Compare with
a new grinder system.
TM
02
53
93
28
02
Warning
Before starting work on the pump,
make sure that the fuses have been
removed or the mains switch has been
switched off. Make sure that the power
supply cannot be accidentally switched
on.
All rotating parts must have stopped
moving.
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.
Warning
When loosening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the screws until the pressure has been
fully relieved.
Note
Used oil must be disposed of in
accordance with local regulations.
Note
A possible replacement of the cable
must be carried out by Grundfos or a
service workshop authorised by
Grundfos.
