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FRAMES
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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BOLT SPECIFICATIONS AND TORQUES
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 FRAMES Riveting Hot  rivets  are  acceptable,  as  they  can  be  more  easily driven with hand tools.  Cold rivets should only be used where tools of sufficient power to properly set the rivets are provided. Rivets should be from 50% to 100% as heavy in diameter as the total thickness of the plates to be riveted. Welding Electric    arc-welding    is    recommended    for    all    frame welding.    The  reinforcements  should  be  welded  to  the  frame after the reinforcements are riveted.  All unused holes should be  filled  with  welding  material.    The  welding  rod  should  be substantially the same material as that used in the frame. Preparation Of Frame For Repair Before  welding  the  reinforcement  to  the  cracked  section of  the  frame  side  rail,  certain  preparations  are  necessary  to insure  strength  and  stableness  of  repair.    To  prevent  further spreading of the crack, a hole should be drilled at the starting point  of  the  crack,  Fig.    4.    Widen  the  crack  its  full  length, using  two  hacksaw  blades  together.    Groove  or  bevel  both sides   of   the   crack   to   permit   the   weld   to   penetrate   to   the surface and establish a solid contact between the reinforcement   and   the   frame   side   rail.      Grooving   can   be accomplished by grinding or with a cape chisel. Fig.  4-Showing Method of Drilling Frame Rail to Stop Progress of Crack.  Also shows Method of Preparing Crack for Welding. Fig.        5-Suggested    Types    of    Reinforcing    Plates    and Method of Attaching to Frame Rail. IMPORTANT:  Do  not  weld  into  the  corners  of  the  frame or along the edges of the frame side rail flanges "A", Fig.  5. Welding   at   these   points   tends   to   weaken   the   frame   and encourage development of new cracks. Use  only  the  shielded-arc  method  for  all  frame  welding. Heat   generated   during   welding   is   localized   and   burning   of material is minimized whenever this method is used.  (Fig. 6) Additional   advantages   are   that   the   finished   weld   can   be ground, filed, and drilled as necessary. With  the  reinforcement  positioned  in  the  frame  side  rail, follow  the  welding  patterns  shown  in  Fig.    5  as  closely  as possible. Fig.  6-Weld Sample Showing Lower Heat Dissipation Possible with Shielded Arc Welding. CTS-2037-HA  Page 4 PRINTED IN UNIT ED STATES OF AMERICA

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