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. 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. Table 3-2.  Operator Preventive Maintenance Checks and Services. Location Item Interval Item to Procedure Not Fully Mission No. Check/ Capable If: Service 1. Before Ground Check for proper ground connection at both terminals. Terminals Refer to para 4-2 2 Before Muffler and Check mufflers on roof and stacks between engine and During Exhaust 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. 3 Before Radiator Check sight glass for proper coolant level During opera- During Water Filters, tion, be alert for possibility of gradually falling level Check After Lines and for leaks and security.  Replace filters at intervals specified Coolant in Table 3-1, note (15). 4 Before Crankcase Check sight glass for proper oil level Refer to paragraph During 3-3 to add oil during operation. 5 Before Batteries and Remove battery covers.  Service batteries and check Cables cable for security Change batteries if necessary Refer to Paragraph 3-9. 6 Before Air Restriction Check condition of air filter elements by checking air re- During Indicators striction indicators (Figure 1-5).  If window shows amber or red refer to the next higher level of maintenance for ele- ment servicing. 7 Before Fire Check charge indicators on fire extinguishers in engine After Extinguishers compartment and control room. 8 Before Air control Make sure that air control valves are reset to the open Valves position.  Refer to Figure 3-21. 9 Before Coolant If coolant preheat system is to be used, make sure that all Pre-heat manual valves in the system are open to allow coolant to Manual circulate. Valves 10 Before Oil Breather Make sure that oil breather vents on skid base are not Vents capped 3-16