Inspection; Adjusting The Impeller Clearance - Grundfos DP 10, 0.9 Instrucciones De Instalación Y Funcionamiento

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 table below states the quantity of oil in the oil
chamber:
Pump type
DP and EF pumps up to
1.5 kW
DP pumps of 2.6 kW
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.
20
Quantity of oil in oil
chamber [l]
0.17
0.42
10.6 Service kits.

10.2 Adjusting the impeller clearance

For position numbers, see page 546, 547 or 548.
Proceed as follows:
DP pumps only
1. Loosen and remove the screws (pos. 188c)
holding the inlet strainer (pos. 84). Remove the
strainer.
All pumps
2. Loosen the locking screws (pos. 188b).
3. Loosen the adjusting screws (pos. 189) and push
the wear plate (pos. 162) until it touches the
impeller.
4. 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.
5. Tighten the locking screws.
6. Rotate the impeller by hand to check that it is not
touching the wear plate.
DP pumps only
7. Fit the inlet strainer and tighten the screws (pos.
188c).
See also section 10.3 Cleaning the pump
Fig. 13 Pump viewed from inlet side
housing.