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TM 5-4210-230-14&P-1 CONTROLS TRAILER EMERGENCY VALVE (TRACTOR PROTECTION) With  the  control  in  "Released"  position,  the  service and emergency braking functions of the tractor and trailer are normal in all respects. Should  a  condition  resulting  in  severe  air  loss  from the  tractor  or  trailer  system  be  detected,  or  if  for  any  other reason  it  is  desirable,  in  the  operator's  opinion,  to  cause  an emergency  application  of  the  trailer  brakes,  and  to  close  off both the service and emergency brake lines on the tractor, the operator can move the control to the "Emergency" position.  If the  control  is  not  moved  from  the  "Released"  position  under these conditions, the tractor protection valve will automatically close  the  air  lines  leading  to  the  trailer  and  apply  the  trailer brakes. The  operator  should  also  move  the  control  to  the "Emergency"  position  when  connecting  or  disconnecting  the trailer, or when operating a truck-tractor without a trailer.  It is important  that,  after  connecting  to  a  trailer,  the  control  be returned to "Released" position to permit charing of the trailer air  system  and  normal  braking  control  of  both  tractor  and trailer. TRAFFIC HAZARD WARNING LIGHT SWITCH The traffic hazard warning light switch is required to flash  both  front  and  rear  directional  signals  simultaneously, thus  warning  traffic  of  an  emergency.    The  switch  is  located on the end of the turn signal control. With   the   turn   signal   lever   in   center   position,   pull switch out to operate signal lights.  To turn off, push switch in. Hazard    warning    operation    is    indicated    by    simultaneous flashing   of   both   turn   signal   indicators.      Hazard   warning system should be used for emergency only in compliance with the laws of the state in which the vehicle is operated. TRAILER BRAKE HAND CONTROL The  trailer  brake  hand  control  is  used  to  apply  the trailer   brakes   without   the   use   of   the   tractor   brakes.      On slippery  roads,  use  the  trailer  brake  control  to  prevent  the trailer from jackknifing. IMPORTANT Do  not  use  the  trailer  brake  hand  control  for parking purposes. Have     the     air     brake     system     periodically inspected by your IH Dealer for safety on the highway. TRAILER MARKER LIGHT SWITCH This switch controls the clearance (marker) lights on the cab and trailer. TRANSFER CASE CONTROL (4x4) The transfer case control is used to select the high or low  speed  range  of  the  transfer  case  See  Vehicle  Operation section for operating instructions. TRANSMISSION CONTROLS (Main and Auxiliary) These  controls  are  used  to  select  the  various  gear ratios or speeds provided within the transmission. See Vehicle Operation section for operating instructions. TUNNEL COVER (Engine) To remove the engine cover (in cab), pull outward on the cover latches. TURN INDICATOR CONTROL To signal for a right turn, push the control away from you.  For a left turn, pull the control toward you.  Signal lights on the front and rear of the truck and in the instrument cluster "blink" on and off when the turn indicator is operating. 6

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