Hi! We have five induced draft cooling fans installed at our site. Recently we experienced high vibration on one of our fan gearbox having accelerometer installed in horizontal direction to gearbox casing. The max vibration was around 17 mm/sec and spectrum revealed GMFs with modulation where 2 x GMFs dominated for first set gears which are spiral bevel gears.
Any idea what could be the probable issue?? Is it due to misaligned gears??
If yes then what factors could contribute to this issue?