ARMY TM 9-6115-639-13
AIR FORCE TO 35C2-3-386-51
MARINE CORPS TM 10155A-13/1
2-5. LEAKAGE DEFINITIONS FOR OPERATOR PMCS.
It is necessary for you to know how fluid leakage affects the generator set. Following are types/classes
of leakage an operator needs to know to be able to determine the status of the generator set. Learn these
leakage definitions and remember: When in doubt, notify your supervisor.
WARNING
Class III oil leaks should be reported IMMEDIATELY to your
supervisor. Fuel leaks of any kind require immediate system
shutdown. Failure to observe this warning can result in personal
injury.
CAUTION
Equipment operation is allowable with Class I or Class II oil
leakage. Of course, consideration must be given to fluid capacity
in the item/system being checked/inspected. When in doubt,
notify your supervisor.
When operating with Class I or II oil leaks, continue to check
fluid levels as required in your PMCS.
a. CLASS I - Seepage of fluid (as indicated by wetness or discoloration) not great enough to form
drops.
b. CLASS II - Leakage of fluid great enough to form drops but not enough to cause drops to drip from
item being checked/inspected.
c. CLASS III - Leakage of fluid great enough to form drops that fall from item being
checked/inspected.
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