TM 10-3930-671-24 NOTE Use  recommended  fluid  only.    Refer to  Group  2.1,  Service  Specifications, for fluid specifications. 9. Fill    sump    tank    with    new    fluid.        DO    NOT OVERFILL. NOTE Remove  or  pull  dipstick  part  of  the way  out  to  vent  air  from  tank  while refilling. 10. Install new sump breather cap. Check Operation of Hydraulic System WARNING Be  sure  there  is  adequate  overhead clearance  before  raising  the  upright or   damage   to   equipment   or   injury could result 1. Start    the    engine    and    operate    the    hydraulic system.      Cycle   the   hydraulic   system   several times.      Raise   the   lift   carriage   to   the   highest position and lower fully down. WARNING Do  not  use  your  hands  to  check  for hydraulic    leakage.    Use    a    piece    of cardboard    or    paper    to    search    for leaks.  Escaping fluid under pressure can penetrate the skin causing serious     injury.          Relieve     pressure before     disconnecting     hydraulic     or other  lines.    Tighten  all  connections before     applying     pressure.          Keep hands and body away from pin holes and  nozzles  which  eject  fluids  under high pressure.  If any fluid is injected into   the   skin,   it   must   be   surgically removed   within   a   few   hours   by   a doctor familiar with this type injury or gangrene may result. 2. Check for leaks.  Clean up any oil spills. 3. Check  hydraulic  sump  fluid  level.    Add  fluid,  as necessary,  to  bring  the  oil  level  to  the  correct FULL level as shown on dipstick.  Do not overfill. 4. Stop  the  engine.    Turn  key  switch  OFF.    Close the  engine  compartment.    Remove  blocks  from the wheels, if used. This completes the procedure for changing the hydraulic fluid and filter. F-453