Cascade Machinery & Electric, Inc. Cascade Machinery & Electric, Inc Sales and Service of Pumps, Motors and Compressors since 1918 Get a Quote
Problem: Motor vibrates.
Like Causes: What to Do:
Motor misaligned to load. Realign load.
Load out of balance. (Direct drive application.) Remove motor from load and inspect motor by itself. Verify that motor shaft is not bent. Rule of thumb is .001" runout per every inch of shaft length.
Motor bearings defective. Test motor by itself. If bearings are bad, you will hear noise or feel roughness. Replace bearings. Add oil if a sleeve of bearing. Add grease if bearings have grease fittings.
Rotor out of balance. Inspect motor by itself with no load attached. If it feels rough and vibrates but the bearings are good, it may be that the rotor was improperly balanced at the factory. Rotor must be replaced or rebalanced.
Motor may have too much endplay. With the motor disconnected from power turned shaft. It should move but with some resistance. If the shaft moves in and out too freely, this may indicate a preload problem and the bearings may need additional shimming.
Winding may be defective. Test winding for shorted or open circuits. The amps may also be high. Replace motor or have stator rewound.
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