TM 10-4320-344-10 Table 1-4.   Description of Major Components, Model US636HCCD-1. Item No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Item  Name TRAILER      ASSEMBLY BATTERY  BOX DIESEL  ENGINE CONTROL  PANEL INERTIAL  BRAKING  SYSTEM RUNNING/BRAKE  LIGHTS REAR  JACKS PARK BRAKE LEVER SAFETY  CHAINS INTERVEHICULAR  CABLE ASSEMBLY BREAKAWAY  CHAIN CENTRIFUGAL   PUMP TONGUE  JACK (TRIPOD   ASSEMBLY) 1.12    DIFFERENCES BETWEEN MODELS. Description   and   Purpose Supports   and   transports   pump   unit. Provides   weatherproof   protection   for   battery. Drives  pump. Engine  operating  mode  is  set  on control   panel. Can  be  operated  in  electric manual   or   electric   automatic   mode. Controls   pump   and   engine   operations. Activated   by   motion   of   towing   vehicle. Releases hydraulic   brakes   when   towing   vehicle   moves forward. Applies   hydraulic   brakes   when   towing vehicle   slows   or   stops. One   near   each   rear   corner   of   trailer. Provide visual   aid   while   trailer   is   being   towed. Used  to  level  pumping  assembly  and  prevent trailer   from   tipping   when   disconnected   from towing   vehicle. Used   to   lock   wheels   in   place   when   trailer   is   not in   transit. Hook  to  towing  vehicle. Prevent   trailer   from running   away   if   accidentally   uncoupled   from towing   vehicle. Used   to   connect   trailer   electrical   system   with towing   vehicle   electrical   system. Applies   hydraulic   brakes   if   trailer   accidentally recouples   from   towing   vehicle. Rated  at  600  GPM  at  350  ft  tdh. Draws water from   source   or   upline   boost   pump   and   discharges to  outlet  or  feeds  downline  boost  pump. Fitted with   suction   and   discharge   elbows   suitable   for connection   to   6   inch   grooved   pipe   couplings. Supports   front   of   trailer   when   disconnected   from towing   vehicle. Differences   between   the   pumping   assemblies   are   identified   in   Table   1-5. An  X  or  a number   (quantity)   under   the   applicable   column   heading   indicates   that   the characteristic   applies   to   that   item. 1-12