TM 10-3930-671-24 i. If something does not work, refer to troubleshooting instructions in Chapter 2. j. If anything looks wrong and is too difficult to fix, write it on DA Form 2404 and notify your supervisor. k. When doing PMCS, take tools and supplies needed to perform all tasks. 3-11. FLUID LEAKAGE DEFINITION. The following paragraphs describe the different types/classes of leaks and how they affect the status of the truck.  Class I and II leaks are considered minor leaks and operations can continue under these conditions.  When operating with these types of leaks, fluid levels must be checked regularly as required in the PMCS. a. Class I Leaks.  Class I leaks are identified by a wetness or  discoloration  not  great  enough  to  form  drops.    It  is more of a seepage than a leak. b. Class II Leaks.  Class II leaks are identified by a flow of fluid great enough to form drops but not great enough to cause the drops to fall from the leak point. c. Class III Leaks.  Class III leaks are identified by a flow of fluid great enough to form drops that fall from the leak point. (1) If a Class  III  leak  is  discovered  before  operating  the  truck,  the  truck  can  be  operated  as  long  as  the  fluid level is between the maximum and minimum points on the dipstick or sight glass.  If the fluid level is below the minimum point on the dipstick or sight glass, do not operate the truck until refilled. (2) If a Class III leak is discovered during operation of the truck, the operation can be completed as long as the leak is drops only and not a steady stream of fluid.  The fluid level must also be within its operating range.  If the leak is a steady stream and/or fluid level falls below minimum point on dipstick or sight glass, turn off the truck. (3) If  a  Class  Ill  leak  is  discovered  after  operation  is  complete  and  the  truck  fluid  level  is  below  minimum  on dipstick or sight glass, the truck cannot be operated until the leak is repaired. 3-12. PMCS TABLE DESCRIPTION. The PMCS Table is arranged in columns which inform unit maintenance which item is being inspected/ serviced, when a truck assembly or component should be inspected/serviced, where the item is located, and the procedures necessary to accomplish the task. a. Item No.  The Item No.  column provides a logical sequence for performing the PMCS tasks.  The items  being inspected can be visible, inside, or under the truck. b. Interval.  The Interval column provides the appropriate time interval for performing each task.  This column lists the time intervals within which the tasks should be performed.  Intervals are broken into two groups:  months of operation and hours of operation.  In all cases, checks of items in  the  PMCS  table  should  be  performed  under  whichever  interval occurs first. c. Item to Be Inspected.  This column lists the name of the assembly or component to be inspected/ serviced and its location on the truck. d. Procedure.  The Procedure column provides instructions necessary to accomplish the inspection/ service.  It also lists  important  Warnings,  Cautions,  and  Notes  related  to  each  task.    If  a  task  is  covered  elsewhere  in  manual,  it  is referenced instead by paragraph number rather than being repeated in this column. 3-8