ARMY TM 9-6115-604-12NAVY 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.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 beingchecked/inspected.c.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.LocationItemIntervalItem toProcedureNot Fully MissionNo.Check/Capable If:Service1.BeforeGroundCheck for proper ground connection at both terminals.TerminalsRefer to para 4-22BeforeMuffler andCheck mufflers on roof and stacks between engine andDuringExhaustroof for condition, leakage, and security During operation,be alert for development of excessively black, white, orblue exhaust smoke. (If coloration develops, refer toTROUBLESHOOTING for interpretation.3BeforeRadiatorCheck sight glass for proper coolant level During opera-DuringWater Filters,tion, be alert for possibility of gradually falling level CheckAfterLines andfor leaks and security. Replace filters at intervals specifiedCoolantin Table 3-1, note (15).4BeforeCrankcaseCheck sight glass for proper oil level Refer to paragraphDuring3-3 to add oil during operation.5BeforeBatteries andRemove battery covers. Service batteries and checkCablescable for security Change batteries if necessary Refer toParagraph 3-9.6BeforeAir RestrictionCheck condition of air filter elements by checking air re-DuringIndicatorsstriction indicators (Figure 1-5). If window shows amber orred refer to the next higher level of maintenance for ele-ment servicing.7BeforeFireCheck charge indicators on fire extinguishers in engineAfterExtinguisherscompartment and control room.8BeforeAir controlMake sure that air control valves are reset to the openValvesposition. Refer to Figure 3-21.9BeforeCoolantIf coolant preheat system is to be used, make sure that allPre-heatmanual valves in the system are open to allow coolant toManualcirculate.Valves10BeforeOil BreatherMake sure that oil breather vents on skid base are notVentscapped3-16
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