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FRONT AXLE (4x4)
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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SHIFTING INTO THE LOW SPEED RATIO
TM 5-4210-230-14&P-1 VEHICLE OPERATION IMPORTANT For  the  first  320  km  (200  mi.)  operate  your new    vehicle    with    locking    hubs    in    "lock" position to assist in initial break in of the front driving axle. DO NOT DRIVE unless controls on both hubs are set properly and both are set the same! BE  SURE  THAT  BOTH  HUBS  are  in  either "FREE"    position    (TURN    COUNTERCLOCK WISE  TO  FREE)  or  "LOCK"  position  (TURN CLOCKWISE TO LOCK).  Arrow in center of controls  must  always  point  directly  to  one  of the   dots   on   the   rim   of   the   hub,   controls "SEAT"  when  in  position!    You  can  feel  the control "SEAT" itself when it is properly set.  If arrow does not point to one of the dots, it will not  seat.    Both  hubs  must  always  be  set  the same! IMPORTANT USE FINGERS ONLY TO TURN CONTROLS.      If   controls   do   not   turn   freely with your fingers, move vehicle slightly either way in two-wheel drive, standard gear range, and try again.  DO NOT FORCE CONTROLS WITH TOOLS. WHEN TO USE "FREE" OR "LOCK" POSITION:   Use   "FREE"   for   all   driving   that does  not  require  four  wheel  drive  power  and traction.      Use   "LOCK"   whenever   four-wheel drive is used. To  avoid  excessive  torque  loads  on  the  rear axle,  DO  NOT  drive  vehicle  in  low  range  of transfer case with locking hubs set in "FREE" position. POWER DIVIDER LOCK CONTROL (For tandem drive axles) The  power  divider  lock  control  is  used  with  vehicles equipped with dual real axles having inter-axle differentials. For  normal  driving  on  hard  surface  roads,  the  control should be moved to the "out" (unlocked) position. To transmit equal power to both rear axles when under heavy  load  and  one  or  both  wheels  of  the  axle  are  slipping, the  control  should  be  moved  to  the  "in"  (locked)  position.    A green  (PDL  warning  light  on  the  instrument  panel  indicates the control is in locked position. IMPORTANT Move  control  to  the  "in"  (locked)  position  at low    speeds    and    never    when    wheels    are slipping. SHIFTING (Main and auxiliary transmission) The auxiliary transmission, used in conjunction with the main   transmission,   provides   additional   gear   ratios.      The auxiliary  transmission  (in  addition  to  the  main  transmission) must  be  placed  in  one  of  the  driving  positions  before  power can be transferred to the rear wheels. The auxiliary transmission gear shifting is similar to the main transmission. The operator can, after knowledge of his load and road conditions, manipulate the gear ratios of a main and auxiliary transmission  to  obtain  the  most  efficient  operation  and  road speed for his particular operation. Selection of the "UD" (underdrive) gear in the auxiliary transmission gives a greater gear reduction than provided by the main transmission. IMPORTANT For  auxiliary  transmissions  that  have  a  deep low (numerically higher than 2.0: 1) underdrive   gear   ration   the   deep   low   gear should  be  operated  or  shifted  only  when  the main  transmission  is  in  low  gear.    The  deep low   gear   is   intended   only   for   starting   the vehicle in motion when fully loaded or for off- highway  use  when  moving  less  than  5  MPH (8.05 KPH) over rough terrain. The   selection   of   the   "OD"   (overdrive)   gear   in   the auxiliary   transmission   provides   a   gear   to   permit   increased road speeds in the various transmission ratios. IMPORTANT When    auxiliary    transmissions    are    use    in combination  with  automatic  transmissions  a loaded  vehicle  should  not  be  started  with  the auxiliary    in    the    "OD"    (overdrive)    position. Auxiliary   transmission   ratio   selections   must be made only when vehicle is not in motion. 8

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