Hobart 9OC24S Operation Manual page 291

GENERATOR DIVISION
HOBART BROTHERS COMPANY
OPERATION, MAINTENANCE , AND OVERHAUL MAN UAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO, 5381A
D. Cleaning
(1) Steam cleaning of generator components is no longer recommended, because
steam and harsh cleaning compounds can be damaging to insulation and can
cause short circuiting. Use a good, SAFE, commercial cleaner on al I parts
except bearings.
CAUTION: DRY ALL PARTS THOROUGHLY AFTER CLEANING.
WARN IN G:
DO NOT USE A FLAMMABLE SOLVENT.
(2) Wipe bearings clean with a dry cloth. Sealed bearings must NOT be washed.
A little tarnish, stain, or corrosion on the outside surfaces are not detrimental
to the operation of the bearing and need not be removed.
E. Inspection
(1) Bearings
Inspect bearings while they are mounted on the shaft.
(a) Inspect the bearings for evidence of physical damage, such as cracks, nicks,
damaged seals, etc.
Inspect for evidence of overheating. Overheated bear-
ings are generally darkened to a brownish blue or blue-black color. Re-
place the bearing if damaged in any way or if it shows evidence of over-
heating.
(b)
Check the be aring for excessive looseness between the races and the bear-
ing balls.
(c) Turn the outer race slowly and check for any roughness or sudden stopping.
Repeat the check while turning the race in the opposite direction. The
outer race should rotate smoothly and without catching. Replace the
bearing if rough or catching.
(d) Even if no defects are found, or suspected, the age and service of the
bearing should be considered before passing it for further service.
If the
hourmeter indicates the bearing has been in operational service approxi-
mately 5000 hours, or more, it should be replaced. The age of the
bearing should also be considered because the lubricating capability of
bearing grease over five years old is questionable.
act 30/73
6-1
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