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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
•
Cable entry
See section
10.6 Service
Make sure that the cable entry is
watertight and that the cables are not
sharply bent and/or pinched.
•
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 by
turning 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.
Quantity of oil in oil
chamber [l]
0.17
0.42
kits.
10.2 Adjusting the impeller clearance
For position numbers in brackets, see page 34, 35 or
36.
Proceed as follows:
DP pumps only
1. Loosen and remove the screws (188c) holding
the inlet strainer (84). Remove the strainer.
All pumps
2. Loosen the locking screws (188b).
3. Loosen the adjusting screws (189) and push the
wear plate (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
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
(188c).
See also section
10.3 Cleaning the pump
Fig. 13
Pump viewed from inlet side
housing.
17
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