Page 4-9.  Chapter 4, Section IV, is superseded as follows: Section IV.  ORGANIZATIONAL PREVENTIVE MAINTENANCE CHECKS AND SERVICES 4-10. Introduction a. General.      Table   4-l   (PMCS   Table)   has   been provided   so   you   can   keep   your   equipment   in   good operating condition and ready for its primary mission. b. Warnings  and  Cautions.  Always  observe  the WARNINGS  and  CAUTIONS  appearing  in  your  PMCS table.    Warnings  and  cautions  appear  before  applicable procedures.    You  must  observe  these  WARNINGS  and CAUTIONS   to   prevent   serious   injury   to   yourself   and others     or     to     prevent     your     equipment     from     being damaged. c. Explanation of Table Entries. (1) Item  Number  Column.    Numbers  in  this column  are  for  reference.    When  completing  DA  Form 2404 (Equipment Maintenance and Inspection Worksheet), include the item number for the check/service   indicating   a   fault.      Item   numbers   also appear   in   the   order   that   you   must   do   checks   and services. (2) Interval   Column.      This   column   tells   you when   you   must   do   the   procedure   in   the   procedure column.    QUARTERLY  procedures  must  be  done  every three   months.      SEMIANNUALLY   procedures   must   be done ever, six months. (3) Item    to    be    Checked/Serviced    Column. This column provides the item to be checked or serviced. (4) Procedure Column.  This column gives the procedures  you  must  do  to  check  or  service  the  item listed   in   the   Item   to   be   Checked/Serviced   column   to know   if   the   equipment   is   ready   or   available   for   its intended   mission   or   for   operation.      You   must   do   the procedure at the time stated in the interval column. (5) Not    Fully    Mission    Capable    lf    Column. Information in this column tells you what faults will keep your  equipment  from  being  able  to  perform  its  primary mission. If you make check and service procedures that show   faults   listed   in   this   column,   do   not   operate   the equipment.    Follow  standard  operating  procedures  for maintaining     the     equipment     or     reporting     equipment failure. d. Other   Table   Entries.      Be   sure   to   observe   all special information and notes that appear in you table. 4-11. Leakage Definitions The   following   are   definitions   of   the   types/classes   of leakage  you  need  to  know  to  be  able  to  determine  the status of your equipment. CLASSIFICATION DEFINITION 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   rot   enough   to cause   drops   to   drip   from   the item being inspected. Class III Leakage of fluid great enough to cause   drops   to   drip   from   the item being inspected. NOTE Fluid   levels   of   items   with   Class   I   and Class II leaks must be checked often so proper levels can be kept. Class   III   leaks   must   corrected   before releasing the equipment for operation. Table 4-1.  Organizational Preventive Maintenance Checks and Services for Crawler-mounted Rock Drill Item Item to Not Fully Mission No. Interval Check/ Service Procedure Capable If: NOTE Checks 1 through 6 are for units equipped with retrofit kit. 1 Weekly Feedshell Check all bolts and nuts on feedshell for Any  bolts  loose  or tightness.  Pay particular attention to missing. drifter drill mounting bolts and feed- shell slide mounting bolts. 2 Weekly Feed Chain Check chain deflection weekly.  Ensure Chain cannot be ad- that chain is not so tight that no deflec- justed. tion occurs not so loose that is sags.  Ad- just if necessary (see paragraph 5-13). 6