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TM   9-2520-272-34&P 4-28. DISASSEMBLE   CENTER   HOUSING 8 9 10 11 12 13 14 (SHEET  13  OF  19) Using   fingers,   install   5/16-18   x   1-1/2   inch   bolt   (8)   two or   three   turns   into   one   pitot   tube   (9). Pull   tube   (9)   out   of   center   housing   (2). Remove   preformed   packings   (10,   11)   from   tube   (9). Repeat   steps   8,   9   and   10   for   other   tube   (9),   then   go   to step  12. Using   two   screwdrivers,   remove   retaining   ring   (12) that   retains   clutch   disk   (third   clutch   backing   plate) (13). Using   two   pry   bars,   gently   wiggle   backing   plate   (13)   to loosen   it.   Remove   backing   plate   (13). Remove  pin  (14)  which  was  freed  when  plate  (13)  was removed. CAUTION When   removing,   handling,   or   installing   clutch   packs,   keep   all   clutch   disks   and plates   in   the   same   order   and   facing   the   same   way.   Under   heat   and   pressure, clutch   plates   can   take   on   a   conical   shape,   called   coning.   Each   plate   will   differ in   degree   of   coning.   When   coned   plates   are   mixed   or   turned   over,   they   cannot seat   properly   against   each   other.   This   can   prevent   plates   from   making adequate   surface   contact   with   each   other   for   the   clutch   pack   to   operate effectively . When   one   clutch   disk   or   plate   needs   to   be   replaced,   replace   the   entire   clutch pack   Individual   clutch   plates   should   not   be   replaced,   because   such   new   plates will   not   have   the   surface   contour   of   adjoining   older   plates,   decreasing effectiveness   of   the   clutch   pack Clutch   assemblies   function   in   pairs.   When   one   clutch   pack   fails,   a   second clutch   pack   will   often   be   defective. Failure   of   one   clutch   pack   requires inspection   of   all   clutch   assemblies   in   the   range   pack. Go   to   Sheet   14 4-184 Para.   4-28,   Task   6


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