TM 5-3895-373-20 2.19. HYDRAULIC SYSTEM DIAGNOSTICS. Perform   hydraulic   system   tests   whenever   you   have   a problem   with   the   hydraulic   system   or   if   sent   here   by another diagnostic test. Most  of  the  paving  machine’s  hydraulic  functions  share pumping  and  flow  control  components  with  at  least  one other circuit.  Try to determine which hydraulic function is most  affected  by  the  fault  condition.    Refer  to  the  index below  for  the  diagnostic  procedure  that  applies  to  your system fault. Hydraulic  systems  can  be  hazardous.    Always  heed  the following    warnings    when    troubleshooting    or    servicing components in the hydraulic system. Hydraulic    oil    under    pressure    can penetrate  skin  or  damage  eyes.    Oil leaks    under    pressure    may    not    be visible.    Use  apiece  of  cardboard  or wood  to  find  leaks,  but  do  not  use  a bare  hand.    Wear  safety  goggles  for protection.    If  oil  enters  skin  or  eye, get immediate medical attention. Do  not  move  under  any  hydraulically controlled   component   when   making adjustments or repairs to the hydraulic system. Lower the component  and  work  from  above.    If the   component   must   be   raised   for access, always block it for full support.        If    a    component    drops, severe   injury   or   death   to   personnel can result. NOTE Throughout these hydraulic systems diagnostic procedures,  the  engine  should  be  running  at  high  idle when performing a functional check of a hydraulic device or circuit. When  diagnosing  hydraulic  devices  that  are  controlled through  the  stack  valve,  references  will  be  made  to  the stack valve wiring diagram on page 2-265. When   a   fault   is   isolated   to   a   specific   component,   the paragraph  number  of  the  repair  task  for  replacement  of the component is cited in the diagnostic flowchart.  If the repair task is general (i.e.: wiring and harness repair), the repair task is cited in the Reference Information Column. Male  connectors  on  paving  machine  most  often  house female   terminals   (receptacles,   jacks).      Mating   female connectors   house   male   terminals    (plugs).        Plug/jack nomenclature in text and diagrams is based on nature of connector terminals (male or female), not on appearance of connector housing. Refer  to  TM  5-3895-373-10  for  paving  machine  switch locations. Throughout this diagnostic procedure, a simplified schematic of the circuit under test is shown.  Reference electrical   schematics   at   back   of   manual   for   complete circuit wiring. Diagnostic Index Fault Location Page Hydraulic Cylinder Circuits ................................... 2-264 Auger/Conveyor Circuit ........................................ 2-306 Screed Vibrator Circuit ......................................... 2-324 2-263