Inspection; Adjusting The Impeller Clearance - Grundfos SL1.50 Series Installation And Operating Instructions Manual

10.1 Inspection

Inspect pumps running normal operation every 3000
operating hours or at least once a year. If the dry
solids 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
10.5 Oil change.
The oil chamber of all pump models holds 0.17
litre.
Used oil must be disposed of in
Note
accordance with local regulations.
• 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 impeller, pump housing, etc. for possible
wear. Replace defective parts. See section
10.6 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
authorized by Grundfos.
10.6 Service kits.

10.2 Adjusting the impeller clearance

The SLV pumps (SuperVortex) with semi-open
impeller do not need impeller adjustment.
SL1 pumps
For position numbers, see page 32.
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
Note
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
10.3 Cleaning the pump
Fig. 12 Pump viewed from inlet side
housing.
17