TM 55-4920-328-13 horsepower, torque, temperature, vibration, oil pressure and     quantity,     and     water     brake     temperature     and pressure.  Refer to paragraph 1-5 for leading particulars of the test trailer assembly. (1) Test Trailer Module. (a)    The    test    trailer    module    (figure    1-3) consists   of   a   frame   and   running   gear   assembly   (3), crane  assembly  (10),  2  slave  units  (12),  4  latch  arm guide assemblies (17 through 21), storage box (8), cable trays  (14),  deck  plates  (13),  forward  and  aft  leveling jacks  (11),  torque  arm  assembly  (16),  and  associated plumbing    and    cabling.        The    unit    also    mounts    the hydraulic start system (4), electric start system (5), fuel system   (1),   oil   system   (6),   air   system   (2),   and   the portable oil lubricating unit pumping assembly (7).  One slave  unit  actuates  the  engine  fuel  control  overspeed governor (Nil) lever during engine test.  The other slave unit  actuates  the  engine  fuel  control  (NI)  power  during engine test.  The two slave units are remotely controlled by master control units in the control cab module.  The four  latch  arm  guide  assemblies  provide  a  means  of supporting   and   stabilizing   the   engine   dolly   assembly during engine testing.  After the dolly axle is lowered to the   latch   arm   guide   assembly,   the   latch   arm   (20)   is positioned   over   the   axle.      The   swing   eye   bolt   with handle (21) fits into the end slot of the latch arm.  The latch arm is secured by turning the handle in a clockwise direction. NOTE U.    S.    Army  (USATSARCOM)  authorized ECP No.  MEG-01, dated March 26, 1981, identifies    the    replacing    of    the    gasoline engine   driven   hydraulic   starting   unit   and the  battery  starting  system  with  a  Christie Rectifier   Power   Supply   starting   system. (Army   supported   electrically   driven   units are currently available.  ) (b)  The  storage  box  is  located  on  the  test trailer  deck  in  front  of  the  hydraulic  and  electric  start systems.  The storage box is 44.  00 inches long, 14.  00 inches wide, and 14.  00 inches high and is bolted to the test  trailer  deck.    The  storage  box  is  used  for  storing torque   arm   weights.      Two   cable   trays   which   provide support  for  4  hose  assemblies  and  7  cable  assemblies are located beneath the right side of the test trailer deck. The aft cable tray is approximately 59.  12 inches long, 20.    06  inches  wide,  and  5.    56  inches  deep.    The forward  unit  is  approximately  35.    00  inches  long,  20. 06 inches wide and 5.  62 inches deep.  A third cable storage tray is  located  beneath  the  forward  test  trailer  deck.    The storage tray is 40.  25 inches long, 33.  75 inches wide, and  6.    50  inches  deep.    The  aft  deck  plate  is  95.    12 inches wide, 60.  37 inches long, and 0.  25 inch thick. The  forward  deck  plate  is  95.    12  inches  wide,  65.    12 inches long, and 0.  25 inch thick.  The two deck plates are     formed     of     diamond     tread     aluminum          plate. Significant details of the equipment installed on the test trailer  module  are  described  in  subsequent  paragraphs in this section. (2)  Test trailer frame and running gear assembly. The test trailer frame and running gear assembly (figure 1-4)    consists    essentially    of    a    frame    assembly    (2), running   gear   and   brake   system   assembly   (6),   dolly support frame (1), 3 stop lights (4,5) and 2 signal lights (3).  The aft running gear has dual 15-inch wheels with pneumatic   tires.      The   forward   running   gear   has   a steerable  axle  assembly  with  a  removable  drawbar  (8) and   two   15-inch   wheels   with   penumatic   tires.      The brakes   are   air/   hydraulic.      The   aft   parking   brake   is manually  controlled  by  operating  a  brake  lever  (7)  on the right side of the test trailer.  The dolly support frame is a welded assembly 66.  00 inches long, 96.  00 inches wide, and 8.  00 inches high and is bolted to the frame of the test trailer assembly. (3)  Crane  assembly.    The  hydraulically-operated crane assembly (figure 1-5) is used to lift an engine test dolly assembly (figure 1-28), with engine mounted, from the  ground  to  the  test  trailer  deck  for  engine  testing. The   crane   assembly   is   mounted   on   the   left   forward corner  of  the  test  trailer  deck.    The  crane  assembly consists  essentially  of  a  mast  assembly  (4,  figure  1-5), boom     assembly     (3),     boom     assembly     (3),     boom extension (2), hydraulic hand pump (5), and a piston and cylinder  assembly  (9).    Additional  components  of  the crane  assembly  consist  of  a  brake  assembly  (8),  pump handle  (6),  well  assembly  (7),  and  a  chain  and  hook assembly (1).  The lifting capacity of the crane assembly varies with the position of the boom extension.  With the boom  extension  fully  extended,  the  lifting  capacity  is limited to 1,100 pounds.  With the boom extension fully retracted,    the    maximum    lifting    capability    is    4,000 pounds.    The  maximum  boom  swing  is  210  degrees. The brake assembly is used to restrict or prevent crane rotation, when required.  The manual release valve (10) is  used  during  operation.    Instructions  for  operation  of the  crane  assembly  are  provided  in  chapter  2  of  this technical manual. 1-4 Change 4