ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
· Equipment operation is allowable with minor leakages (Class I or II). 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 leaks, continue to check fluid levels as
required in your PMCS.
· Class III leaks should be reported immediately to your supervisor.
CLASS I - Seepage of fluid (as Indicated by wetness or discoloration) not great enough to form drops.
CLASS II - Leakage of fluid great enough to form drops but not enough to cause drops to drip from item being
CLASS III - Leakage of fluid great enough to form drops that fall from item being checked/inspected.
Table 3-2. Operator Preventive Maintenance Checks and Services.
Not Fully Mission
Check for proper ground connection at both terminals.
Refer to para 4-2
Check mufflers on roof and stacks between engine and
roof for condition, leakage, and security During operation,
be alert for development of excessively black, white, or
blue exhaust smoke. (If coloration develops, refer to
TROUBLESHOOTING for interpretation.
Check sight glass for proper coolant level During opera-
tion, be alert for possibility of gradually falling level Check
for leaks and security. Replace filters at intervals specified
in Table 3-1, note (15).
Check sight glass for proper oil level Refer to paragraph
3-3 to add oil during operation.
Remove battery covers. Service batteries and check
cable for security Change batteries if necessary Refer to
Check condition of air filter elements by checking air re-
striction indicators (Figure 1-5). If window shows amber or
red refer to the next higher level of maintenance for ele-
Check charge indicators on fire extinguishers in engine
compartment and control room.
Make sure that air control valves are reset to the open
position. Refer to Figure 3-21.
If coolant preheat system is to be used, make sure that all
manual valves in the system are open to allow coolant to
Make sure that oil breather vents on skid base are not