4. Back off all adjusting nuts another half-turn (anti-clockwise).
5. Place the lower nuts on the studs.
6. Tighten the lower nuts evenly all around.
The clearance between the impeller and the lower diffuser shall be as little as possible.
Check that the impeller can easily be rotated by hand.
In order for the pump to perform at maximum capacity, the impeller must be adjusted regularly.
Troubleshooting
A universal instrument (VOM), a test lamp (continuity tester) and a wiring diagram are required in order to carry
out troubleshooting on the electrical equipment.
Troubleshooting shall be done with the power supply disconnected and locked off, except for those checks which
cannot be performed without voltage.
Always make sure that there is no one near the pump when the power supply is turned on.
Use the following checklist as an aid to troubleshooting. It is assumed that the pump and installation have formerly
functioned satisfactorily. Electrical work shall be performed by an authorized electrician. Follow local safety
regulations and observe recommended safety precautions.
1. Pump fails to start
Is an alarm signal indicated
- If the stator temperature is high, check that
the cooling system is working and that the
- If there is a fault in the thermal protectors,
Check that the overload protection is reset.
a) Fault in the level equipment (start sensors).
b) Fault in control equipment.
- that all connections are intact.
- relay and contractor coils.
- that the control switch “Man/Auto” makes
contact in both positions.
- that the main power switch is on.
- that there is voltage in each phase of the
- that all the fuses have continuity and are tight.
- that the overload protection is reset.
- that there is no break in the motor cable.
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