TM 10-3930-664-10 CAUTION · 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 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR MODELS MHE-270 AND MHE-271 Location Item Interval Item to Procedure Not Fully Mission No. Check/ Capable If: Service IMPORTANT Perform "Weekly" as well as "Before" operators PMCS if: 1. You are the assigned operator and have not operated the vehicle since the last weekly check. 2. You are operating the vehicle for the first time. WARNING Unless otherwise specified, perform all maintenance procedures with all equipment lowered to the ground, transmission in neutral, parking brake applied, and the engine stopped.  Failure to perform these tasks could cause personal injury or death. 2-17