Before calling out a VA specialist

Having vibration problems? The guys at AMT are keen to help.
But before we come out please check the following.
1. Surroundings
• Any other machines operating nearby? • Is floor around the machine vibrating? • How is the
vibration of the machine when it is stopped but all others in the surrounding are still going? •
Structural resonance can be observed during rundown. Feel the vibration at the worst location, stop
the driver and feel if the vibration goes up before it goes down.
2. Feel / Listen / Smell
Feel: if you don’t like the feel of the vibration you are normally not too far of that something is
wrong. Listen: yes, the old screwdriver is still the most cost-effective instrument to listen to bearing
noise. Smell: mostly too late to investigate: Shut It Down!
3. Support/ Structure
• Is foundation adequate for the machine? • Are the hold-down bolts tight? • Can you feel different
vibration between the base and the floor by putting your finger on the seam.
4. Motor
• Run uncoupled and feel the vibration. • Check the motor pulley for balance by observing the roll
back from several positions. • Check the motor pulley for wobble and run-out. • When running a
motor solo, listen to the bearings when coasting down. • When a motor returns from re-winders,
put the motor on rubber mat, run it up, check the vibration. • When did you last lube the bearings?
5. Coupling, direct or pulleys/ belts
• Check pulley alignment with feeler gauges or straightedge, if in doubt have coupling aligned with
laser. • Check that belts are matched and properly tensioned. • Check pulley for damage. • Are all
coupling pins and inserts in good order?
6. Driven (Fan, Pump, etc.)
• Check if the rotor is clean, undamaged or worn. • If the rotor needs balancing in-situ, check access
to the rotor (hatch). • Check shaft for looseness. • Check for balance by observing rollback. • When
did you last lube the bearings?