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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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COMPONENTS LEGEND FOR FIGS.  2, 3, 4, 5, 6, 7 & 8
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 PROPELLER SHAFT CONSTRUCTION The   basic   functions   having   been   designated,   let's look at conventional universal joint and driveshaft construction. To    transmit    required    loads,    the    driveshaft    must possess  high  strength.    Forged  steel,  or  high  strength  cast yokes  are  generally  used  to  provide  necessary  strength  and the   rigidity   required   to   maintain   bearing   alignment   under torque  loads  and  during  high  speed  operation.  Special  high- strength  tubing  is  used  to  provide  maximum  torque  carrying capacity  at  minimum  practical  weight.    This  tubing  must  be securely welded to its end members, to provide the necessary torque capacity. High     quality     anti-friction     bearings     are     used     to withstand   required   loads   while   oscillating   at   high   speeds. These bearings on the journal cross carry vary high loads for their size.  The full complement, roller-type (needle) bearings are generally used because of their high capacity in a limited space.  Bearings are individually sealed to provide retention of required  lubricants  as  well  as  to  prevent  the  entry  of  foreign material.    If  lubricants  become  contaminated  with  water  or abrasive   material,   needle   bearing   life   is   seriously   affected. Abrasive material is a major problem where a vehicle operates under conditions of extreme moisture and dirt.  Off- highway   installations   are   especially   critical   in   this   respect. Military trucks represent the extreme in this direction and were the  first  to  show  the  shortcomings  in  the  conventional  cork seals  used  in  universal  joint  bearings.    It  was  found  that  an improved    seal    was    required    for    this    type    of    operation. Synthetic     rubber-type     seals     were     developed     for     these installations.  These seals have been in use for many years on military   vehicles   and   are   now   used   in   most   commercial installations.  The improved sealing shows increased life and a less critical re-lubrication cycle. The sliding splines between slip joint and permanent joint  must  support  the  driveshaft  and  be  capable  of  sliding under  full  torque  loads.    To  provide  adequate  strength  and wear   resistance,   hardened   and   ground   splines   are   used. These  splines  are  phosphate  coated  to  resist  galling  and  to reduce sliding friction. CTS-2730  Page 5 PRINTED IN UNITED STATES OF AMERICA

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