TM -5-4220-209-12&P Table 1-1.  Table of leading Particulars - Continued ITEM ENGINE ACCESSORIES Starting motor Alternator Fuel CLUTCH ASSEMBLY Type CAPACITIES Fuel tank Engine lubricating oil - With filter change - Without filter change Compressor lubricating oil - With filter change - Without filter change PARTICULARS 12 vdc 20 amp, 14 vdc, negative ground ASTM D975-Nr.  2 diesel Dry, single plate, manually operated 16-3/4 gallons (62 ltr) 6.2 quarts (6 Itr) 5.2 quarts (5 Itr) 5 quarts (4.7 ltr) 4 quarts (3.8 Itr) 1-3.      DESCRIPTION.      The    air  compressor    is  a  self contained   unit   consisting   of   nine   major   groups;   the control    panel;    dehydrator    and    air    purification    group; trap/accumulator  mounting  group;  air  cooler  assembly; air compressor group; clutch, unloader control and drain valve; engine group; frame and skid group.  (See Figure 1-1). 1-4.      CONTROL  PANEL  GROUP  (1,  Figure  1-1).    The control panel group consists of dehydrator/air purification assembly,    control    panel    and    the    instrument    panel assembly.    Shock    mounts    on    the    instrument    panel protects the gauges and meters from excessive vibration during unit operation. All operating controls and indicators   are   located   on   either   the   control   panel   or instrument    panel.        The    air    cooler    subassembly    is attached    to    the    inside    of    the    control    panel.        Two removable  sliding  cooler  doors  attached  to  the  control panel   allow   the   area   of   the   air   cooler   exhaust   to   be varied for best operation of the air cooler.  Clamps on the cooler doors allow for stationary positioning of the doors. The control panel is also attached to the frame and skid group. 1-5.      DEHYDRATOR      AND        AIR        PURIFICATION GROUP   (13,   Figure   1-1).      This   group   consists   of   a mechanical filter subassembly (13), two dehydrators and priority    valve    (II    1),    and    (12),    three    air    purification cylinders  (6,  7  and  8)  and  a  ten  micron  filter  (3).    The mechanical   filter   removes   oil,   moisture,   and   air-borne foreign  particles  from  the  pressurized  air  prior  to  the  air entering  the  dehydrators.  Each  dehydrator  contains  an oxygen    purifier    cartridge    (MA-2).        The    dehydrator removes oil and moisture from the pressurized  air.  The air   purification      cylinders      use   the   (’-I-13X   oil   vapor removal    cartridge,    CO    6    carbon    monoxide    removal cartridge   and   C-I-AC   activated   charcoal   air   freshner cartridge.  The cartridges perform these functions through absorption and catalytic action.  Records should be  maintained  for  each  dehydrator  and  air  purification cylinder,  so  that  elapsed  time  of  use  for  each  purifier cartridge  in  each  cylinder  can  be  maintained.    The  ten micron  filter  subassembly  contains  a  replaceable  filter element.      This   element   traps   any   remaining   foreign particles     larger     than     ten     microns     and     traps     any condensate remaining in the pressurized air. 1-6.  TRAP AND ACCUMULATOR MOUNTING GROUP (21, Figure 1-1).  This group is mounted on the left side of  the  air  compressor  unit  on  the  frame  and  skid  group behind the control panel.  Attached to the trap mount are the  first  through  third  stage  trap  subassemblies  and  the accumulator   cylinder.      This   group   helps   to   separate excessive water and oil residue from the pressurized air. 1-7.    AIR  COOLER  SUBASSEMBLY  (10,  Figure  1-1). The    air    cooler    subassembly    removes    the    heat    of compression     from the     air     between stages. Air compressed in the first stage cylinder passes through the first   stage   air   cooler   and   moisture   separator   into   the second  stage  cylinder.    Similarly,  air  compressed  in  the second stage cylinder passes through the second stage air  cooler  and  moisture  separator  into  the  third   stage cylinder.      Air   compressed   in   the   third   stage   cylinder passes  through  the  third  stage  air  cooler  and  moisture separator into the fourth stage cylinder.  Air compressed in  the  fourth  stage  cylinder  passes  through  the  fourth stage  air  cooler,  mechanical  filter,  dehydrators,  and  into the  air  purification  system.    Air  passing  through  the  air coolers   lowers   the   air   temperature.      This   increases compressor efficiency.  Also, condensed water and oil is removed between    1-2