Nidec 22765-01, Manual

Page: 201 / 227

Page 30
Every 20,000 Hours or 3 Years of Operation
With generators that have sleeve oil bearings, perform a sleeve bearing
inspection to include the removal of the upper bearing housing and
bearing liner to inspect the liner, shaft journal, and seal surfaces for
wear and scoring.
Remove the endbrackets, and visually inspect the generator end
windings for oil or dirt contamination. Excessive contamination may
necessitate surface cleaning with compressed air and electrical solvent.
Inspect the fan and fan hub for damage.
Every 30,000 Hours or 5 Years of Operation
Disassemble the generator (this includes rotor removal).
Clean the generator windings using either (depending upon the
severity of contamination) compressed air and electrical solvent or
use de-greaser and high pressure hot water wash. Dry the windings to
acceptable resistance levels (see the dry out procedure).
Inspect the rotor shaft bearing journals for wear or scoring.
With generators that have ball or roller bearings, replace the bearings.
With generators that have sleeve bearings, replace the bearing liners
and oil seals.
NOTE: For specific lubrication instructions,
always refer to the bearing lubrication
sheet that came with your manual or the
lube plate on the generator.