36
6.6 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.
Leakage at the
pump body, at
the connections,
at the mechani-
cal seal and at
the stuffing box
or gland seal.
1. Pump is twisted (causing leaks at the
pump body or at the connections).
2. Housing seals and seals at the
connections are defective.
3. Rotating mechanical seal dirty or stuck.
4. Rotating mechanical seal worn.
5. Stuffing box packing worn out.
6. Surface of shaft or shaft safety sleeve worn
down.
7. Elastomer unsuitable for the pumping
medium.
1. Install the pump so that there is no stress
on it. Support the pipelines at fixed points.
2. Replace the housing seals or the seals of
the connections.
3. Inspect and clean the rotating mechanical
seal.
4. Replace mechanical seal.
5. Tighten the stuffing box packing, add more
packing, or replace the packing.
6. Replace the shaft or the shaft safety
sleeve.
7. Use an elastomer suitable for the pumping
medium and the temperature.
Unallowable
temperature
increase at the
pump, bearing
housing, or
motor.
1. Air in the suction line or in the pump.
2. Bearings have too little, too much, or the
wrong kind of lubricant.
3. Pump and bearing housing are twisted.
4. Axial thrust too high.
5. Motor safety switch is defective or not
properly adjusted.
6. Pressure valve closed.
1. Vent the suction line or the pump and refill.
2. Add more lubricant, decrease the amount,
or replace it.
3. Install the pump so that there is no stress
on it. Support the pipelines at fixed points.
Check the alignment of the coupling.
4. Inspect the relief holes in the impeller and
the split rings at the inlet.
5. Check the adjustment. Replace the motor
safety switch if necessary.
6. Open the pressure valve.
Problem
Cause
Remedy
Tab. 5
Troubleshooting
