TM 1-1500-204-23-9 (1) Close  the  bottle  pressure  outlet  valve and the regulator pressure outlet valve. (g) Disconnect the filler line from the equip ment being serviced. (5)   Inspection.   The   following   general   operator inspections apply to the oxygen servicing unit. Detailed inspection requirements are contained in the applicable maintenance    manual. (a)   Regulator   pressure   outlet   valve.   Verify that the valve is fully closed. (b)  Bottle  pressure  outlet  valve.  Verify  that the valve is fully closed. (6)  Maintenance.  Consult  the  applicable  main- tenance  manual  for  scheduled  and  preventive  mainte- nance requirements. h. Hydraulic Fluid Dispenser-Bleeder. NOTE NSN 4910-00-245-1832 (Formerly NSN 4920-00-245-1832) This machine must be used only by properly trained and qualified personnel. This  type  construction  requires  special  proce- dures in filling the dispenser and charging it with  compressed  air.  Read  and  understand  all labels  on  the  machine  before  operating.  Nev- er  exceed  50  PSI  when  charging  fluid  dis- penser   bleeder. Check all controls before each use. If any al- terations  or  substitutions  have  been  made, DO NOT USE THE MACHINE. (1)   Purpose.   The   hydraulic   fluid   dispenser- bleeder  (NSN  4910-00-245-1832)  contains  a  Buna-N bladder  in  which  air  pressure  is  maintained  in  order  to eject   oil   from   the   machine.   This   special   bladder   is approximately the same size as the tank and when filled with  air  approximately  fills  the  tank’s  volume.  The  pur- pose of the bladder is to separate the hydraulic fluid in the tank from the compressed air used to expel fluid into a hydraulic  system  thereby  insuring  that  no  air  or  con- densation  will  contaminate  the  hydraulic  fluid  or  brake system. (2)  Operating  procedures.  To  fill  the  dispenser- bleeder proceed as follows: (a) Depress   bleeder   valve   located   UNDER THE  PRESSURE  GAUGE.  Do  not  tamper  with  the  pres- sure  relief  valve.  This  bleeder  valve  drains  the  bladder  air cavity of pressure. (b) To  deflate  the  bladder  completely,  while continuing to press bleeder valve, put no more than 10 PSI of air pressure into the fluid cavity of the tank through the air valve located in the filler cap. This will reduce the size of the bladder to allow maximum oil capacity in the tank  and  all  air  in  the  bladder  will  be  ejected  through  the bleeder   valve. (c)   When   all   air   stops   coming   from   the bladder bleeder valve, thus indicating that the bladder is flat, release the bleeder valve. (d) Release the air pressure in the oil cavity of the tank by pressing TANK bleeder valve. Only if pres- sure  gauge  reads  zero  and  no  further  air  flows  from TANK bleeder valve and bleeder valve located UNDER THE PRESSURE GAUGE, remove the filler cap. Never   operate   machine   if   filler   cap   (NSN 4910-01-127-7365) is not in place. (e) Pour up to 5 gallons of hydraulic fluid into  the  tank.  Replace  filler  cap  and  tighten  with  wrench. (f) Inflate  bladder  through  the  AJE  valve located UNDER THE PRESSURE GAUGE to 10 PSI. Protect eyes from oil spray. (g) Bleed  all  trapped  air  from  the  fluidcavity by pressing the TANK bleeder valve and holding it until a clear stream of hydraulic oil ejects. (h) Inflate  bladder  through  AIR  valve  under pressure gauge. Do not exceed 50 PSI. Should PRES- SURF RELIEF valve open, stop inflating immediately. (i) Recharge the bladder as required. If 3 1/2  to  4  gallons  of  oil  are  used  to  charge  the  tank,  a sufficient air cavity will be left to expel the liquid charge with a single air charge. 9-56 Change   3