Drive train
Vol. 17 #4, Mar. 1991
Have you checked/changed the gearbox oil lately?
Have the filters been changed?
Is the cooling tower water properly lined up and turned on?
Check the alarms to be sure they are functional it is easier than rebuilding a gearbox.
See also
Cooling water
Decreased motor amps
Gear box oil
Gearbox oil level
Plant layout