TM 9-2350-256-34-1 (7)  Harnesses.    The  cables  and    wires  carrying the electrical circuits, serving the various components of the   electrical   system,   are   assembled   into   harnesses. These   carry   the   interconnecting   splices   in   protective covering   and   incorporate   various   types   of   terminals. These   terminals   make   positive   and   secure   electrical connections at the various points served by the harness and    provide    for    easy    connection    and    disconnection without splicing or soldering. h.    Transmission  and  output  Reduction  Units..    The Allision  Model  XT-1410-4  cross-drive  transmission  is  a combined transmission and steering unit.  It consists of a basic   transmission   unit   package   to   which   has   been added   the   torque-converter   package   (front),   steering- clutch  packages  (both  sides).    The  output-together  with the  sprocket  hubs,  make  out  the  output  reduction  units. The  outer  flange  of  each  output-reduction-gear  output shaft    assembly    carries    10    studs    for    attaching    the sprocket  hub.    The  transmission  provides  a  fluid  torque converter connection between engine and final drive ant three   selective   gear   ration   forward   and   one   ratio   in reverse.  Repair  information  is  contained  in  TM  9-2520- 215-34,   Direct   and   General   Support   Maintenance   for Transmission, Cross-Drive Assembly (Allison Model XT- 1410-4). i.    Tracks  and  Suspension.  The  track  laying  system includes 12 dual road wheels (six on each side) that ride on  the  two  84-link  tracks.    Two  double  sprocket  hubs power  the  tracks.    Two  compensation  idler  dual  wheels and  six  track  support  dual  rollers  (three  on  each  side) make  up  the  balance  of  the  track  laying  portion  of  the track   and   suspension   system.   The   road   wheels   are mounted  on  suspension  arms  which  bear  the  weight  of the  vehicle.    Torsion  bars,  anchored  to  the  hull  at  one end  and  to  each  suspension  arm  at  the  other,  provide spring  action  for  the  suspension  arms.    An  adjustable link,  between  each  Compensating  idler  wheel  arm  and front  road  wheel  arm,  provides  for  adjustment  of  track tension.    Shock  absorbers  at  the  first,  second  and  sixth road wheels limit the rate of suspension arm movement at those points.  Double volute bumper springs at the first and   sixth   road   wheel   arms   provide   cushioning   during maximum  road  wheel  arm  travel.    Refer  to  TM  92350- 256-10,   Operator’s   Manual,   and   TM   9-2350-256-20, Organizational   Maintenance   Manual,   for   replacement and repair instructions j Hull and Cab. The hull and cab are constructed of cast armor and armor plate welded into a single unit. Armor  is  distributed  to  protect  the  crew  and  equipment against small-arms fire, medium artillery shell fragments and  20-pound  antitank  mines.    Hull  bottom  armor  is equivalent to that of current medium  tanks.    The  hull  is equipped    with    an    armored,    turret-type    cupola    that provides   a   mount   for   the   caliber   0.50      machinegun. Additional  armament  stowed  in  the  cab  consists  of  two M16  or  M14  rifles,  two  submachineguns  and  10  LAW rockets.    Four  formfitting,  padded,  adjustable  seats  are provided   for   the   four-person   crew.      Two   removable pedestal stools accommodate two passengers.  The two- shot fixed fire extinguisher system may be operated from inside    or    outside    the    vehicle.        Two    portable    fire extinguishers  are  mounted  in  the   crew   compartment. Stowage racks for tools and other equipment are located at  various  points  inside  the  cab.    Stowage  facilities  for track  sections,  cables,  tow  bars  and  various  recovery tools and equipment are  provided  on  the  outside  of  the hull  and  cab.    A  crew  access  door  is  located  on  teach side  of  the  cab.    Two  escape  hatches  in  the  front  roof area of the cab are provided for the drive and mechanic. One  escapee  hatch  at  the  rear  roof  area  of  the  cab  is provided for the rigger.  The commander’s escape hatch is  located  in  the  cupola.    Six  M17  periscopes  provide forward and partial side indirect vision for the driver and mechanic  during  daylight  and  night  driving.    One  M17 periscope provides indirect rearward vision for the rigger. Four direct vision blocks, tow at front ant two at rear of cab, provide vision for driver, mechanic and rigger.  Six direct vision blocks in the cupola base afford 360-degree vision  for  the  commander.    An  AN/WS-2(V)1A  passive night viewer may be installed in the driver’s hatch when blackout operations are required. k. Winch,   Power   Takeoff,   Hoist   and   Spade.      A hydraulically  operated  broom,  hoist  winch,  main  winch and spade comprise the basic recovery equipment of the vehicle.    they  are  powered  by  the  main  hydraulic  pump which  is  operated  by  a  mechanical  transmission  driven by a power takeoff from the CHANGE 7  1-13