TM 5-3895-373-20 1.11. CHARACTERISTICS, CAPABILITIES, AND DATA. The  paving  machine  is  a  turbosupercharged,  4-cylinder, diesel    powered,    hydraulically    driven    tracked    vehicle. The   engine   is   coupled   to   a   dual   main   pump   drive gearbox  which  drives  two  propulsion  pumps  in  tandem with   two   auxiliary   pumps   and   one   auxiliary   vibration pump.   The propulsion pumps supply hydraulic pressure to the track drive motors.   The auxiliary hydraulic pumps are   used   to   operate    all    controls    and    cylinder    drive functions. Control   handles   on   the   operator   control   panel   control each  track  drive  motor  located  on  the  undercarriage  of the paving machine.   Paving speed is from 0 to 135 fpm (O to 41 mpm) with travel speed (switch selected) of 0 to 3.2    mph    (O    to    5,    2    kph).            Hydraulic    cylinders automatically maintain tension on the 12-inch wide steel track pad.   A high wear-resistant rubber pad is attached to each track pad.   Spring applied hydraulically released disc   brakes   are   located   between   the   hydraulic   drive motors  and  torque  hubs.      In  the  event  that  hydraulic pressure   or   electrical   power   is   lost,   the   brakes   are automatically applied. Push  rollers  are  located  in  front  of  the  material  hopper and  are  designed  to  ride  against  the  rear  wheels  of  the paving  material  haul  truck.      The  push  rollers  allow  the paving  machine  to  push  the  haul  truck  forward,  while continuing to receive material into the hopper and spread the paving material at the same time.   Hopper wings are hydraulically    raised    and    lowered    from    the    operator control  console.      Dual  slat  conveyors  move  the  paving material    from    the    hopper    to    the    auger,    and    are independently     controlled     from     the     operator     control console.    Two  electric  actuators  control  flow  gates  that meter  the  amount  of  material  conveyed  to  the  augers. Two    12-inch    (304    mm)    augers    spread    the    paving material in front of the screed. Four diesel fuel-fired burners are located on the screed. The   burners   heat   the   screed   plates   to   approximately 300°F (150°C) to prevent paving material from sticking to the    screed    plates.        The    screed    is    hydraulically extendable from 8 to 14 feet (2, 4 to 4, 3 m) and can be extended further to 16 feet (4, 9 m) with bolt-on screed and auger extensions.   Mechanical adjustments on the screed  control  the  thickness,  slope,  and  crown  of  the paving material.   The screed vibrator provides the initial compaction  of  the  paving  material.      The  amount  of compaction is controlled by the frequency and amplitude of   vibration.      Vibration   is   controlled   by   the   screed vibration  control  valve,  located  underneath  the  operator platform on the rear tractor bulkhead. 1.12. LOCATION   AND   DESCRIPTION   OF   MAJOR COMPONENTS. The  following  provides  the  location  and  description  of major  paving  machine  components  maintained  by  the organizational  maintenance activity. 1.12.1.   Engine Compartment. The engine compartment  houses  the  paving  machine  drive  system and   hydraulic   power   components,   air   cleaner,   filters, radiator,  hydraulic  oil  cooler,  exhaust  system,  and  flow gates.   These components are described as follows: a.    Drive System and Hydraulic Power.   The paving machine   drive   system   includes   a   turbosupercharged diesel engine with a pump drive gearbox adapted to the engine flywheel.   Directly coupled to the gearbox drives are   two   main   hydraulic   propulsion   pumps.         The propulsion pumps provide hydraulic power to the left and right track drive motors.   Two auxiliary hydraulic pumps, and one vibration pump are connected to the propulsion pumps  in  tandem.      These  pumps  provide   hydraulic power  to  non-propulsion  hydraulic  functions  needed  to operate the paving machine. 1-3