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REBUILDING DRIVESHAFTS
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INSTALLING PROPELLER SHAFT
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 PROPELLER SHAFT INSTALLATION Fig.  36 JOURNAL   CAPS   WITH   LOCK   FLATS   (Fig.      36)- When installing new journal kit caps into yoke ear holes, the lock flat on two of the journal caps must be kept in alignment with the locking flats near the front of the yoke ears.  Proper location of locking flats will assure that the journal cap will not rotate. The  installation  of  a  driveshaft  into  the  vehicle  does not present any unusual mechanical difficulties.  Before actual installation, the driveshaft should be checked for the following items: 1. No damage or dents on driveshaft tubing which could cause  unbalance.    If  the  dents  are  severe  enough they  can  weaken  the  tube  and  a  failure  might  occur under torque load. 2. Splines   should   slide   freely   with   slight   drag   from spline seal. 3. Bearings should flex and be free from excessive bind. A  slight  drag  is  the  most  desirable  condition  on  a new  universal  joint.  This  drag  is  from  the  bearing seals.      When   rotating,   yoke   lug   deflections   cause some  additional  clearance.    Excessive  looseness  is not desirable due to the resulting unbalance. 4. Mounting   flanges   and   pilots   should   be   free   from burrs, paint and foreign substances which would not allow proper seating at assembly. The    driveshaft    is    mounted    using    flange    bolts,    bearing capscrews,    or    "U"    bolts    depending    upon    the    size    and construction.    These  bolts  must  carry  high  torque  loads  and should   be   of   quality   material   and   properly   torqued.      The following reviews requirements on these bolts: 1. Flange   Bolts:   Flange   bolts   should   be   alloy   steel equivalent   to   SAE   Grade   8,   high   strength   bolts. These  bolts  used  with  spring  lockwashers  and  nuts provide  the  capacity  required.    The  nuts  should  be torqued to the following specifications: N.m Ft.  Lbs. 5/16"-24 Thread 29.8-32.5 22-24 3/8"-24 Thread 54.2-59.6 40-44 7/16"-20 Thread 85.4-94.9 63-70 1/2"-20 Thread 132.9-146.4 98-108 IMPORTANT In cap and bolt construction joints (Fig.  7), be sure  to  torque  the  capscrews  to  135.6  N.m (100  ft.lbs.).  These  joints  are  usually  in  the inter-axle assemblies. 2. U-Bolt Style.  Yokes: On smaller size universal joints, a  "U"  bolt  style  end  yoke  is  used.  This  construction permits   easier   assembly   where   the   smaller   size bearings allow its use.  The bearing race is seated in a  half  round  hole  and  under  locating  ears.    Be  sure that  mounting  faces  are  cleaned  of  rust,  paint  and other foreign material.  The "U" bolts are assembled over   the   bearing   races   to   retain   them   in   the   end yokes.  Spring lockwashers and nuts should be used with   these   "U"   bolts   at   assembly.      The   following torque loads are suggested for use with these parts: N.m Ft.  Lbs. 5/16"-24 Thread 18.9-23.0 14-17 3/8"-24 Thread 27.1-32.5 20-24 7/16"-20 Thread 43.3-50.1 32-37 These    torque    loads    are    somewhat    lighter    than normally  used  with  these  thread  sizes,  however,  the  lower torques are required to prevent bearing race distortion. ASSEMBLING SLIP JOINT ON SHAFT Fig.  37 CTS-2730  Page 19 PRINTED IN UNITED STATES OF AMERICA

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