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GASOLINE ENGINE-AUTOMATIC CHOKE
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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SHIFTING (Main and auxiliary transmission)
TM 5-4210-230-14&P-1 VEHICLE OPERATION CAUTION When   parking   your   diesel   vehicle   the   fol- lowing  procedures  must  be  followed:  Failure to follow these procedures, could result in an unattended  vehicle  moving,    thus  resulting  in personal injury or property damage. When   parking   your   Diesel   vehicle,   do   not leave   transmission   in   gear;   if   vehicle   rolls, engine   could   start   by   heat   of   compression. Use   parking   brake   for   parking   on   a   grade, block wheels or turn to curb. FRONT AXLE (4x4) Pushing   the   control   forward   engages   the   front   axle. Pulling    the    control    backward    disengages    the    front    axle. Neutral     position     is     locked     between     the     engaged     and disengaged   position.      When   the   front   axle   is   engaged,   a "RED"   light   on   the   instrument   panel   will   glow   to   alert   the operator. CAUTION To  avoid  personal  injury  or  property  damage pay strict attention to the following: Should   it   be   necessary   to   operate   the   rear wheels  (with  engine  power)  with  the  vehicle stationary and the rear wheels raised from the ground, first disengage the front axle; otherwise  the  driving  front  axle  will  pull  the vehicle off its support. Parking  brakes  should  be  applied  when  the transmission and transfer case have been left in the Neutral Position with the engine running or not running. IMPORTANT Do   not   keep   the   front   axle   engaged   when operating    on    DRY,    HARD    surfaced    roads EXCEPT  where  it  is  absolutely  necessary  to operate  with  the  transfer  case  in  low  range. Operating on hard dry surfaces with both the front and rear axle engaged creates a build up of    torque    between    the    axles    resulting    in excessive  tire  wear  and  strain  on  the  entire drive unit. When  necessary  to  operate  with  the  transfer case in low range, the front axle drive must be engaged   to   avoid   excessive   torque   load   on the rear axle. FRONT AXLE DISENGAGEMENT (4x4) The  torque  build-up  between  the  front  and  rear  axle sometimes causes difficulty when disengagement of the front axle is attempted while the truck is in motion. To disengage the front axle with the truck in motion, it is  necessary  to  relieve  the  torque  buildup  between  the  front and rear axle by either slacking off abruptly on the accelerator and/or  releasing  the  clutch  while  pressure  is  applied  to  the front axle control. In  some  instances  it  may  be  necessary  to  stop  the truck   and   move   it   slightly   in   the   reverse   direction   before disengagement of the front axle can be completed. FRONT AXLE ENGAGEMENT (4x4) The front axle can be engaged with the truck in motion by pushing the front axle control forward to the "IN" position. It is not necessary to stop the truck or to disengage the clutch when engaging the front axle. If  difficulty  is  encountered  in  engaging  the  front  axle when  the  truck  is  not  in  motion,  it  means  the  splines  on  the engaging   clutch   are   not   matched.   Using   forcing   action   or kicking  the  control  will  not  make  it  engage  but  may  damage the control linkage.  Shift the transmission into low gear and roll   the   truck   forward,   keeping   the   pressure   under   control. When the splines are matched, it will engaged.  It is easier to engage the front axle with the truck in motion. With  automatic  transmission,  it  may  be  necessary  to use a special procedure to shift out of neutral position in the transfer  case.    The  input  shaft  to  the  transfer  case  must  be stopped either by shifting between forward and reverse or by stopping the engine.  Keep pressure on the transfer case lever as the input shaft approaches zero speed. FRONT WHEEL LOCKING HUBS (4x4) Locking    hubs    provide    a    means    of    controlling    the engagement   of   the   front   wheels   with   the   front   drive   axle. When   engaged,   full   power   is   transmitted   to   both   wheels. Disengagement  with  front  axle  nor  driving  allows  the  front wheels  to  "Free  Wheel",  and  the  axle  shafts  and  differential gears to remain idle, saving unnecessary wear. 7

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