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CONTENTS - TM-5-4210-230-14P-1_962
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MAINTENANCE - TM-5-4210-230-14P-1_965
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 SPRING ASSEMBLIES DESCRIPTION Constant Rate Constant rate springs are leaf-type spring assemblies that have a constant rate of deflection.  For example,    if    227    Kg    (500    lbs.)    deflect    the    spring assembly 2.54 cm (1 in.), then 454 Kg (1000 lbs.) would deflect the same spring assembly 5.08 cm (2 in.).  Thus, the rate of deflection is constant. Constant rate springs are mounted to the axle with U-bolts,  nuts  and  lock  washers.  The  front  end  of  the spring is mounted to a stationary bracket while the rear end  of  the  spring  is  mounted  to  a  spring  shackle.    The shackle   allows   for   variations   in   spring   length   during compression and rebound of the spring. This type of spring assembly is used in both front and rear axle applications on IH vehicles. Figs.  1 and 2 show typical views of constant rate spring assembly applications. Fig.  1 Front Axle Application (Constant Rate) Fig.  2 Rear Axle Application (Constant Rate) Taper Leaf Taper  leaf  springs  are  leaf  type  spring  assemblies  that have spring leafs which are thicker in the center than the ends.    This  design  results  in  a  fewer  number  of  leafs which   provides   lighter   weight   and   softer   ride   due   to lower inner leaf friction. Taper leaf springs are mounted to the axle with U- bolts,   nuts   and   lock   washers.      The   front   end   of   the spring is mounted to a stationary bracket while the rear end  of  the  spring  is  mounted  to  a  spring  shackle.    The shackle   allows   for   variations   in   spring   length   during compression and rebound of the spring. Taper  leaf  spring  assemblies  are  used  on  front axles only.  Figure 3 illustrates a Taper leaf assembly. Fig.  3 Taper Leaf Spring Assembly Auxiliary Springs Auxiliary  springs  are  leaf-type  spring  assemblies usually   mounted   on   top   of   the   vehicle   rear   spring assemblies.    Auxiliary  springs  are  only  used  when  the vehicle   is   under   heavy   load.      The   auxiliary   spring assumes part of the load by contacting special brackets attached  to  frame  rail  slides  when  the  load  is  sufficient to  compress  the  vehicle  rear  spring  assemblies  to  the point of contact. Fig.  4 illustrates an auxiliary spring assembly. Fig.4  Auxiliary Spring Assembly Progressive (Vari-Rate) Progressive (Vari-rate) springs are leaftype spring assemblies  with  a  variable  deflection  rate  obtained  by varying   the   effective   length   of   the   spring   assembly. This  is  accomplished  by  using  a  cam-type  bracket.  As the spring assembly deflects, the point of contact on the bracket moves toward the center of the spring assembly shortening the effective length, Figure 5. Vari-rate   spring   assemblies   also   incorporate   a progressive feature in that the bottom spring leaves are separated at the ends. CTS-2680S  Chapter I  Page 3 PRINTED IN UNITED STATES OF AMERICA

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