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BOLT SPECIFICATIONS AND TORQUES
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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FIFTH WHEEL MOUNTING - TM-5-4210-230-14P-1_705
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 FRAMES b. Preheat the frame rail along the crack area to 500-600 degrees to burn off excess oil or paint then    permit    heated    area    to    cool    to    200 degrees   or   below   before   welding   is   started. Under   no   circumstances   should   the   rail   be heated   to   a   temperature   exceeding   900-950 degrees    F.        since    this    is    the    tempering temperature of the rail. c. Either    alternating    current    or    direct    current reversed  polarity,  combined  with  a  short  arc and   a   beading   or   narrow   weave   technique may be used.  Direct current reversed polarity is recommended or preferred. d. Slag  should  be  removed  after  each  pass  and an  interpass  or  constant  temperature  of  200 degrees should be maintained. e. When sufficient metal has been deposited, the weld bead should be ground flush, Fig.  7, with the surface being repaired. Fig.  7. f. Where    both    sides    of    the    frame    rail    are accessible, a V-groove is ground from the side opposite the repair and the procedure outlined above repeated. Dependent upon accessibility,    "chill"    strips    should    be    used wherever  possible.    The  V-groove  ground  on the opposite side of the repair should be deep enough to enter the sound metal of the first weld repair "C" of Fig.  7. Frame Welds  on  heat  treated  material  tend  to  reduce  physical properties in the weld heat-affected zone.  Because of this, it is  recommended  that  all  reinforcements  be  designed  so  that all  welds  are  parallel,  rather  than  perpendicular  to  the  frame rail   edges.      Welds   perpendicular   to   the   flange   edges   will reduce the carrying capacity of the rail, Fig.  8 and 9. Fig.  8 The edge of the reinforcement flange to the edge of side rail  flange  dimension  should  be  held  to  a  minimum  of  three quarters   of   an   inch   to   keep   the   heat-affected   zone   from extending    to    the    sidemember    flange    edge.        Wherever possible, it is recommended that plug welds of the type shown in Fig.  9, be substituted for edge welds when assembling the reinforcement    to    the    side    rail.        Plug    welds    offer    the advantages  of  a  reduced  heat-affected  zone  plus  increased flexibility and reduced stress concentrations.  When using this method,  one  half  inch  (minimum)  diameter  holes  should  be drilled  and  chamfered  in  the  reinforcement  on  2"  center  to center distances.  At no time should these holes be drilled in the frame rail being repaired.  The reinforcement should then be installed in its proper position on the sidemember and the holes filled with weld material. Again a minimum dimension of 3/4" should be maintained between the weld and the edge of the sidemember flange.    The  voltage,  amperage  and  pre-heat  specifications listed below should be followed. CTS-2037-A  Page 6 PRINTED IN UNITED  STATES OF AMERICA

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