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REPAIR AND REINFORCEMENTS (Heat Treated Frames)
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Fig.  10  Low Mounted Fifth Wheel
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 FRAMES Welding Position Amperes Voltage Downhand 130/140 21/23 Overhead 130/140 21/23 Vertical Up 110/120 22/24 Use  low  hydrogen  electrodes  which  have  superior  crack resistance and notch toughness similar to AWS-E11018.  This type electrode should be stored in a moisture-free container to avoid porosity during welding. Fig.  9 Full Length Reinforcement When  heat  treated  frames  are  to  be  reinforced  over  a greater  portion  of  their  length,  frame  channel  reinforcements should be installed using bolts.  Bolts of high strength material conforming  to  SAE  grade  5  or  better  should  be  used.    The bolts and nuts should be inspected periodically and kept tight, since the strength of the reinforcement depends somewhat on the maximum clamping force between the members. Drilling The   drilling   of   heat   treated   frame   rails   presents   no unusual difficulty.  Standard high speed drills of good quality will   serve   provided   they   are   sharpened   properly   and   not overheated  during  sharpening  or  use.    There  are,  however, special    high    speed    twist    drills    available    having    special materials  which  will  hold  a  cutting  edge  longer.    These  drills are  expensive  and  require  especially  rigid  support,  otherwise drill breakage will result.  When drilling heat treated rails, like in   any   other   drilling   operation,   sufficient   pressure   must   be applied to the drill bit to maintain continuous cutting.  The drill point  should  frequently  be  drenched  with  cutting  oil  (soluble oil)  to  help  cool  the  drill.    Avoid  letting  a  drill  bit  turn  in  the work without cutting.  To do so will usually overheat and ruin the drill. The drill must be held steady during the drilling operation. Avoid   wobble   or   change   of   drill   angle   during   the   drilling operation. Frame Straightening When heat treated frame rails have been bent or twisted, they should not be heated for straightening.  This work should be  done  with  the  frame  rails  cold.    Heating  for  straightening purposes is likely to destroy the rail temper in localized areas, which will bring about rail failures. FIFTH WHEEL MOUNTING The following information has been prepared to avoid any unnecessary  drilling  of  standard  non-heat  treated  and  heat treated  frame  rails,  especially  at  the  frame  rail  flange  when the fifth wheel is being installed. In no instance should welding be used to attach the fifth wheel or mounting parts to the frame rails.  The application of the weld is likely to reduce the strength of the rail in the area of  the  weld.    Bolts  must  be  used  throughout  the  fifth  wheel installation.    The  only  exception  to  welding  in  the  fifth  wheel installation is the locating block installation at each corner as shown in Figs.  10 and 11. Figs.  10 and 11 show two methods of mounting the fifth wheel.    Fig.    10  shows  mounting  where  the  deck  plate  is attached at frame rail level.  This mounting can be modified to raise    the    fifth    wheel;    however,    the    mounting    should    be changed to that shown in Fig.  11.  The mountings illustrated in Figs.  10 and 11 should not be utilized without the use of a deck plate. Low Mounting With  reference  to  this  type  mounting  Fig.  10  shows  the various details to follow.  Note that the drawing shows a 4 x 3- 1/2"  mounting  angle  at  the  frame  rail  which  is  cut  out  at  the spring hanger to provide 1/8" clearance. Where  rivets  are  present  the  mounting  angles  must  be drilled  to  provide  clearance  for  rivet  heads  (C  on  drawing). This  applies  to  rivets  in  the  frame  flange  as  well  as  frame side. Bolts must be used throughout the installation of the fifth wheel mounting.  However, locating blocks can be welded to the mounting angles as shown in Fig.  10.  These blocks must be   welded   in   place   before   the   angles   are   installed   on   the frame rail. CTS-2037-HA  Page 7 PRINTED IN UNITED STATES OF AMERICA

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