TM  9-2250-261-20-1 Table 2-1. Unit  Level  Preventive  Maintenance  Checks  and  Services  for M113A2  FOV Item Interval Item To No. Be Inspected Procedure Not   Mission Capable  If: WARNING Hot  parts  can  burn  you.  Use  care when  working  near  hot  compo- nents. With engine at idle, sample engine oil and transmission oil. 6 Semi- Engine HARDTIME A n n u a l    a nd Hardtime  interval  may  be  shortened  if Hardtime   interval T r a n s equipment   operates   under   adverse exceeded. mission conditions   (for   artic   operations,   refer to FM 9-207; for desert operations, re- Continued fer to FM 90-3). NOTE If   AOAP   laboratory   is   not   avail- a b l e ,    d r a i n    e n g i n e    o i l    a n d change   filter   element/gaskets every   1500   miles   or   annually. T r a n s m i s s i o n    o i l    s h o u l d    b e drained   and   filter   element/gas- kets changed every 150 hours/1500   miles   or   semi-annu- ally. CAUTION Engine   and   transmission   can   be damaged   if   filled   above   the   full (F)  mark  on  the  gage  rods. QN  CONDITION To drain engine or transmission oil, re- move   bottom   access   cover   and   drain plug.   Inspect   oil   for   metal   particles. Replace  engine  or  transmission  oil  fil- ters  each  time  an  oil  change  is  re- quired.  If  metal  chips  are  found,  notify Direct  Support  maintenance.  See  TM 9-2350-261-20,  pages  4-3  or  18-8  for removal  of  oil  filters. NOTE Remove   the   driver’s   side   access panel   to   replace   engine   oil   filter. Transmission   oil   filter   is   re- placed   through   the   bottom   ac- cess   cover. 2 - 4 6 Change  4