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UNIVERSAL JOINT SEALS
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LUBE SPECS - TM-5-4210-230-14P-1_948
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 PROPELLER SHAFT LUBE SPECS DON'T NEGLECT DRIVE SHAFT LUBRICATION Lack of adequate or proper lubrication is among the most   common   causes   of   U-Joint   and   drive   shaft   failure! Proper   servicing   of   the   drive   shaft   is   an   essential   part   of vehicle maintenance and should not be overlooked in routine shop procedure. UNIVERSAL JOINTS IN THE VEHICLE OR APPLICATION To    insure    proper    lubrication    of    all    four    bearing assemblies  on  universal  joints,  it  is  essential  that  mechanics add lubricant until it appears at all journal cross bearing seals (Fig.  10).    This  assures  removal  of  dirt  particles  and  other contaminants  that  may  find  their  way  into  the  bearings  and indicates    to    the    mechanic    that    the    bearings    are    fully lubricated.  Do  not  assume  that  bearing  cavities  have  been filled with new lubricant unless flow is noticed around all four bearing  seals!  Journal  cross  seals  are  designed  to  relieve. However, if all the seals do not "pop" when being lubed, move the driveshaft laterally in all four directions and pull or push on the  drive  shaft  in  the  direction  opposite  to  the  journal  cross seal not relieving while lube gun pressure is being applied to the alemite fitting.  An increase in line pressure may also be necessary. Fig.  10 DRIVE SHAFT ASSEMBLY Factory assembled drive shafts are lubricated at the plant  prior  to  shipment.    However,  shipping,  handling  and installation of the drive shaft assembly into the vehicle usually results  in  some  loss  of  lube.    Therefore,  it  is  recommended that all universal joints be relubricated after installation of the drive shaft prior to putting vehicle in service. JOURNAL AND BEARING KITS Replacement universal joint kits contain only enough grease to provide needle bearing protection during storage.  It is therefore necessary to completely lubricate each replacement kit prior to assembly, into the drive shaft yokes. Each journal cross lube reservoir should be fully packed with a  recommended  grease  and  each  bearing  assembly  should also  be  wiped  with  the  same  grease;  filling  all  the  cavities between  the  rollers  and  applying  a  liberal  grease  coating  on the  bottom  of  each  race.    After  the  kits  are  installed  into  the driveshaft yokes and prior to placing into service, they should be relubed, through the zerks, using the same grease. LUBRICANT For  center  bearings,  slip  joints  and  universal  joints use IH 251 HEP grease or equivalent NLGI #2 multi-purpose grease. RELUBE CYCLES Relubrication   cycles   for   driveshaft   universal   joints and   slip   splines   will   vary   with   service   requirements   and operating conditions.  Refer to Operator's Manual. SLIP JOINT LUBRICATION Relube  spline  at  intervals  prescribed  in  Operator's Manual.    Apply  grease  gun  pressure  to  lubrication  zerk  until lubricant   appears   at   pressure   relief   hole   in   welch   plug   at sleeve  yoke  end  of  spline  (Fig.    11).    At  this  point,  cover pressure relief hole with finger and continue to apply pressure until grease appears at sleeve yoke seal (Fig.  12).  This will insure complete lubrication of spline. CTS-2730  Page 10 PRINTED IN UNITED STATES OF AMERICA

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