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Preparation Of Frame For Repair
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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REPAIR AND REINFORCEMENTS (Heat Treated Frames)
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 FRAMES Important In   addition   to   the   specific   recommendations   given   in these   paragraphs,   always   remember   the   following   general rules of welding "good housekeeping". 1. Surface areas and edges to be joined must be clean and free of oil or grease. 2. Always avoid craters, notching, and undercutting. 3. Peen    new    welds    to    relieve    stresses    caused    by shrinkage. Positioning of Frame Reinforcements Whenever practical, the welding of frame reinforcements should be confined to the web of the side rail rather than the flanges.      This   procedure   provides   the   strongest   possible assembly. Avoid  at  all  times  welds  made  square  with  the  side  rail, either on webs or flanges.  When welds are made at an angle of at least 30 degrees from square, there is less possibility of setting    up    dangerous    stress    concentrations    in    the    rail. Physical  tests  of  the  strength  of  various  welds  have  shown that a weld made at an angle of at least 30 degrees from the direction of strain will retain the original physical properties of the complete rail section. Frame  Straightening  Use  of  heat  is  not  recommended when   straightening   frames.      Heat   weakens   the   structural characteristics of frame members and all straightening should be done cold.  Frame members (except aluminum) which are bent or buckled sufficiently to show cracks or weakness after straightening, should be replaced or reinforced. Repair and Reinforcements (Aluminum Alloy Frames) The  cutting  and  welding  of  aluminum  alloy  frames  for repair or reinforcement can be accomplished providing correct procedures   are   followed   and   proper   welding   equipment   is utilized.    The  use  of  heat  for  straightening  aluminum  frame rails is not recommended. BOLT SPECIFICATIONS AND TORQUES While  most  IH  frames  are  of  riveted  construction,  there are  some  frames  which  are  assembled  with  bolts  and  nuts. Bolting, though more costly does provide the field with a time saving advantage  when  replacing  crossmembers  or  frame  attaching parts. If  bolting  is  used  for  altering  or  adding  to  the  frame,  the following precautions must be observed. NOTE: Bolts to be used for installing fifth wheels must be 5/8"  diameter  high  strength  material  such  as  I.    H.    Type  8 (SAE grade 8) bolts.  Type 8 bolts can be identified by the six radial   lines   on   the   head   of   the   bolt.      Nuts   must   be   of corresponding type. The torque value for tightening these bolts is 220-250 ft. lbs.      and   is   based   on   new   bolts   and   nuts   lubricated   with engine  oil.    If  frame  components  are  aluminum,  flat  washers must be used next to the aluminum whether under head, nut or both. Proper  tightening  of  bolts  and  nuts  is  most  important, since   the   strength   of   the   joint   depends   on   the   maximum clamping force between the members. REPAIR AND REINFORCEMENTS (Heat Treated Frames) With  the  use  of  heat  treated  frame  rails  in  International vehicles,    it    becomes    advisable    to    outline    some    of    the procedures   to   be   followed   whenever   these   frames   require repair. Heat    treated    frame    rails    must    not,    of    course,    be intermixed with non-heat treated rails.  If one side rail is to be replaced, the new rail material must match the old frame rail. Preparation Of Frame For Repair A good method to follow when repairing a cracked frame where the crack is accessible from both sides is as follows: a. Grind  a  V  notch  or  groove  extending  along  the  full length  of  the  crack  and  slightly  beyond  each  end  of the  crack.    A  heavy  copper  strip  or  "chill"  should  be clamped to the rail side away from the groove to help control  the  temperature  and  cooling  rate.    See  Fig. 7.  NOTE:  Discarded  short  lengths  of  heavy  copper electrical bus bars make suitable chills. CTS-2037-HA  Page 5 PRINTED IN UNITED STATES OF AMERICA

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