Grundfos NK Montage- Und Betriebsanleitung Seite 36

Fault Cause
5. Too high temperature a) Air in suction pipe or pump.
in pump or motor.
b) Inlet pressure too low.
c) Bearings lubricated with too little, too much
d) Pump with bearing seat stressed by the
e) The axial pressure is too high.
f)
g) The motor is overloaded.
6. Oil leaking from a) The bearing bracket has been filled with too
bearing bracket.
b) Oil seals defective.
7. Oil leaking from a) Threads on reservoir damaged.
reservoir.
15. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
36
or unsuitable lubricant.
pipework.
Motor-protective circuit breaker is defective
or setting is incorrect.
much oil through the filling hole, resulting in
an oil level above the bottom of the shaft.
Remedy
Vent the suction pipe or the pump and replenish.
Increase the liquid level on the suction side. Open the
isolating valve in the suction pipe. Make sure that all the
conditions in 6.4 Pipework are complied with.
Replenish, reduce or replace the lubricant.
Mount the pump so that it is not stressed.
Support the pipes.
Check the alignment of the coupling.
See section 6.3.2 How to align the unit.
Check the relief holes of the impeller and the lock rings
on the suction side.
Check the setting of the motor-protective circuit breaker
and replace, if necessary.
Reduce the flow rate.
Drain off oil until the constant-level oiler starts to operate,
i.e. when air bubbles can be seen in the reservoir.
Replace oil seals.
Replace reservoir.
Subject to alterations.