Smearing Damage in Cylindrical Roller Bearings During Uncoupled No‑Load Motor Test Runs 1. The workshop problem A repaired electric motor is assembled with a new cylindrical roller bearing, usually on the drive end. The coupling, belt, pump, fan, gearbox, or driven machine is not connected. The motor is then run “free” on the test stand … Continue reading Smearing Damage in Cylindrical Roller Bearings During Uncoupled No‑Load Motor Test Runs