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Straight Rearward Driving
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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DIFFERENTIAL REMOVAL
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 This engagement and disengagement or indexing operation continues throughout the turn with a rapidity   that   is   in   direct   relation   to   the   speed   of   the overrunning wheel. As  the  vehicle  completes  the  turn  and  is  again driven  in  a  straight  forward  direction,  differential  action no  longer  being  required,  both  driven  clutch  members become fully engaged with the clutch teeth of the spider; then  the  operation,  as  described  in  "Straight  Forward Driving, " is resumed. Forward Right-Hand Turn Braking Condition In  this  situation,  the  vehicle  is  moving  forward, but  the  direction  of  torque  of  the  ring  gear  is  reversed, because  the  vehicle  is  being  slowed  down  by  braking action.  This reversal of torque is produced by the action of road traction driving the wheels against the torque of the  engine.    In  this  condition,  when  a  righthand  turn  is negotiated,  the  left-hand  (outside)  wheels  rotate  at  ring gear  speed,  since  the  left-hand  driven  clutch  member remains   fully   engaged   while   the   right-hand   (inside) wheels rotate slower than ring gear speed. The    symmetrical    design    of    the    differential makes  it  possible  to  function  in  the  manner  described above,   which   is,   in   effect,   directly   opposite   to   that described as "RightHand Turn--Forward Direction." It should be noted that if a turn is negotiated in such   a   manner   that   power   is   first   applied   and   then braking    action    is    encountered    before    the    turn    is completed,    the    differential    is    designed    to    function without  interruption  and  will  automatically  take  care  of such reversal of torque. Fig.  40  Left-Hand Turn--Forward Direction Left-Hand Turn Forward Direction In  making  a  left-hand  turn  with  the  vehicle  driven  in  a forward direction, the left-hand wheel   is   on   the   inside   of   the   turn   and   the   power   is applied  to  it  so  that  it  must  rotate  at  ring  gear  speed. The  right-hand  wheel  travels  through  the  greater  arc, being   on   the   outside   of   the   turn.      Its   driven   clutch member   becomes   disengaged   from   the   spider   clutch teeth, permitting it to be rotated by ground traction faster than the ring gear, Figs.  40 and 41. The  operation  of  the  driven  clutch  member  on the right side of the assembly in the foregoing instance is illustrated above. Fig.  41  Forward Left-Hand Turn (Cross Sectional View) Fig.  42  Right-Hand Turn--Rearward Direction Rightand Left-Hand Turns Rearward Direction The operation of the NoSPIN differential when required to  make  turns  while  traveling  in  a  rearward  direction  is identical    to    that    when    making    turns    in    a    forward direction.  When moving rearward in a turn under power, CTS-2095S - Chapter II - Page 5 PRINTED IN UNITED STATES OF AMERICA

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