TROUBLESHOOTING TESTING   AND   ADJUSTING TM    5-3805-263-14&P-2 TROUBLE  SHOOTING Use  this  is  a  reference  for  the  location  and  cor- rection  of  problems  in  the  power  train.  When  more checking   is   necessary,   use   the   7S8875   or   8M2736 Hydraulic   Test   Box.   Locations   of   the   pressure taps,   and   procedures   for   testing   and   adjusting   are given   in   POWER   SHIFT   TRANSMISSION   TEST- ING  AND  ADJUSTING,  Chapter  2,  Part  One. Always  make  visual  checks  first.  Then  check  the operation   of   the   machine   and   go   on   to   check   with the   instruments. VISUAL  CHECKS 1.  Check  the  oil  level  in  the  transmission. 2.  Check  all  oil  lines,  hoses  and  connections  for e. leaks   and   damage.   Look   for   oil   on   the   ground under   the   machine. 3.   Move   the   control   lever   to   all   REVERSE   and all   FORWARD   positions.   The   detents   must   be felt  in  all  positions. 4.  Let  the  oil  out  of  both  screen  housings. Remove  and  check  the  screens  for  loose particles. a. Paper  particles  give  the  indication  of  a direction  clutch  failure. b. Bronze   particles   give   the   indication   of   a speed   clutch   failure. c. Shiny   steel   particles   give   the   indication   of a  pump  failure. d. Rubber    particles    give    the    indication    of    a rubber   seal   or   hose   failure. If  you  find  paper,  bronze,  rubber,  or  steel particles,  all  components  of  the  hydraulic  systems must   be   washed   clean.   Do   not   use   parts   with damage.  Use  new  parts. CHECKS  DURING  OPERATION With  the  engine  running,  move  the  selector  lever to   all   speed   positions.   The   detents   must   be   felt   in all   positions. Operate  the  machine  in  each  direction  and  in  all speeds.  Make  note  of  all  noises  that  are  not  normal and  find  their  sources.  If  the  operation  is  not correct,  make  reference  to  the  CHECK  LIST DURING   OPERATION   for   “problems”   and   “prob- able   causes.” CHECK  LIST  DURING  OPERATION Transmission PROBLEM:  Transmission  does  not  operate  in  any  speed  or does  not  engage  (slips)  in  all  speeds. PROBABLE CAUSE: 1.  Low  oil  pressure  caused  by: Low   oil   level. a. Control  linkage  loose  or  adjustment  not correct. c. Failure  of  the  oil  pump  or  the  pump drive. d. Air  leaks  on  inlet  side  of  pump. f . Leakage   inside   the   transmission. Adjustment  of  the  modulating  relief  valve not   correct,   or   valve   does   not   close. g. Load   piston   not   closing. 2.   Mechanical   failure   in   transmission. 3.  Failure  of  the  differential. 4.  Failure  of  the  final  drive  planetaries. PROBLEM:  Transmission  does  not  shift. PROBABLE   CAUSE: 1.  Low  oil  pressure. 2.   Air   leaks   on   inlet   side   of   pump. 3.  Control  cable  loose  or  adjustment  not  correct. PROBLEM:  Transmission  engages  very  suddenly  (rough shifting). PROBABLE   CAUSE: 1.   Primary   setting   of   the   relief   valve   not   correct. 2.  Adjustment  of  control  linkage  not  correct. 3.   Load   piston   not   closing. 4.   Valve   springs   that   are   weak   or   have   damage. PROBLEM:  Slow  shifting. PROBABLE CAUSE: 1.  Low  oil  pressure. 2.   Inside   and   outside   linkage   adjustment   not correct. 3.   Air   leaks   on   inlet   side   of   pump. 4.   Load   piston   not   closing. 2-30