6EM Thru 18GM - 1100 Vertical Turbine Pumps 37
3. Unbalanced supply voltage.
a. Check supply voltage with volt meter.
Motor Vibrates
1. Motor and pump mis-aligned.
a. Re-align pump and motor.
2. Worn bearings or bent shaft.
a. Disconnect pump from motor and run
motor only.
(1) Repair as necessary.
3. Hydraulic disturbance in discharge piping.
a. Check piping.
4. Unbalanced rotor assembly.
a. Balance rotor.
5. Motor not mounted securely.
a. Secure properly and check
alignment.
Motor Is Noisy
1. Worn thrust bearings.
a. Remove dust cover; rotate rotor by
hand and make visual inspection of
balls and races.
(1) Bearing noise is usually ac-
companied by high frequency
vibration.
2. Electrical Noise.
a. Most electrical motors are noisy
during the starting period. The noise
should diminish as motor reaches full
speed.
Incorrect Rotation.
1. Incorrect connections.
a. Refer to connection diagram and
reconnect according to instructions.
Usually switching any two wires on a
3 phase motor will change rotation.
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