1
Loose mounting / failed isolators
CheckVisual; check bolts. Isolators should compress evenly.
FixReplace isolators, torque mounts.
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2
Worn bearings (motor or airend)
CheckVibration analysis; listen with stethoscope.
FixReplace bearings; airend may need rebuild.
ToolsMechanic's stethoscope · Vibration meter
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3
Valve flutter (reciprocating)
Reciprocating
CheckListen at head; tap test cold.
FixReplace valve plate and gasket.
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4
Belt resonance
CheckTension check; spin freely with power off.
FixRe-tension or replace.
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5
Loose flywheel / sheave
criticalCheckWobble test on shaft; check key and setscrew.
FixRe-key, re-torque setscrew, replace if shaft worn.
SafetyLoose sheaves can explosively fail at speed.
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6
Airend gear wear (screw)
Rotary screw
CheckWhine pitch changes with load; oil analysis shows metal.
FixAirend rebuild/exchange.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.