TM 5-3825-226-24 TROUBLESHOOTING Use   this   as   a   reference   for   the   location   and correction  of  problems  in  the  power  train.    When  more checking   is   necessary,   use   the   5P6225,   7S8875   or 8M2736 Hydraulic Test Box. 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 leaks  and  damage.    Look  for  oil  on  the  ground under the machine. 3. Move  the  selector  handle  to  all  REVERSE  and all  FORWARD  positions.    The  detents  must  be felt in all positions. 4. Let the oil out of the filter housing.  Remove and check   the   filter   element   for   loose   particles. Also, check the magnetic strainer. a. Bronze-colored particles give an indication of a clutch failure. b. Shiny steel particles give the indication of a clutch failure. c. Rubber  particles  give  an  indication  of  a seal failure or hose failure. d. Aluminum particles give an indication of a torque converter failure. If you find metal or rubber particles, all components  of  the  transmission  hydraulic  system  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,"    "probable  causes,"  and  "recommended action." CHECK LIST DURING OPERATION Transmission PROBLEM PROBABLE CAUSE RECOMMENDED CORRECTIVE ACTION Transmission   does   not   operate   in   any   speed   or does not engage (slips) in all speeds. 1. Low oil pressure. a. Low oil level. b. Control  linkages  loose  or  adjustment  not correct. c. Failure of the oil pump or the pump drive. d. Air leaks on inlet side of pump. e. Leakage inside the transmission. f. Adjustment of the modulation relief valve not correct, or valve does not close. g. Load    piston    or    differential    and    safety valve will not close. 1. Check oil level, adjust as needed. 2. Check    control    linkage    for    proper adjustment. 3. Repair  or  replace  oil  pump/pump drive. 4. Repair or replace pump. 5. Repair as necessary to stop leakage. 6. Check   modulation   relief   valve   for proper   adjustment.      If   valve   does not    close,    repair    or    replace    as necessary. 7. Repair or replace load piston/differential and safety valve. 2. Mechanical failure in transmission. a. Repair or replace parts as necessary. 3. Failure of the torque converter. a. Repair or replace as necessary. 4. Failure   of   the   differential   or   the   final   drive planetaries. a. Repair    or    replace    the    differential/final drive planetaries. 2-100