TM  5-3805-258-24-1 H  Y  D  R  A  U  L  I  C   S  Y  S  T  E M 11.  Lift  the  lift  arms  as  high  as  they  will  go.  Do Steps 5 and 6 again only this time move the lift control  lever  to  RAISE  position.  The  pressure on  the  gauge  must  be  the  same  as  in  Step  6. Pilot Pressure For Lower And Float 12. 13. 14. 15. To  check  pressure  for  the  lower  stem,  remove the  swivel  tee  from  hose  assembly  (3)  and  in- stall  it  between  the  hose  assembly  and  elbow at  connector  (10). Lower the bucket to the ground. Do Steps 5 and 6 again, only this time move the lift control lever to FLOAT position. The pressure on the gauge must be the same as in Step 6. Release the pressure in the hydraulic system and remove  the  test  equipment. Remove the air in the pilot system. See PROCE- DURE  TO  REMOVE  AIR  FROM  PILOT SYSTEM. PROCEDURE  TO  REMOVE  AIR  FROM  PILOT SYSTEM WARNING Make reference to WARNING on first page of LOADER HYDRAULIC SYSTEM TESTING AND ADJUSTING section. Air in the pilot system can cause an extremely dangerous condition. The bucket can drop whenever the engine stops or is shut off. If this condition happens the proce- dure that follows should correct the problem. TOOIS   Needed: 6V4161   Hydraulic     Test    Group 5H4018  Cover 5H4019    Covers    (Two) F R O N T     O F     L O A D E R     F R A M E 1.   Hose   assembly   to   rod   end   of   tilt   cylinder.   2.   Bleed   screw for    tilt    back    operation.    3.    Bleed    screw    for    raise    operation. 4-72 T E S T I N G  A N D  A D J U S T I N G NOTE: Loose oil line connections and hoses or lines that  have  oil  leakage  will  let  air  into  the  hydraulic system. 1. 2. 3. 4. Disconnect   hose   assembly   (1)   from   the   tilt cylinder. Install a 5H4019 Cover between the hose assem- bly and the tilt cylinder. Connect hose assembly (1)  to  the  tilt  cylinder. Install  a  5H4018  Cover  between  hose  assem- blies  (6)  and  (7)  and  their  blocks. Start  and  run  the  engine  at  low  idle. B A C K     O F     L I F T     A N D     T I L T     C O N T R O L     V A L VE ( T Y P I C A L ) 4.  Bleed  screw  for  lower  and  float  operations.  5.  Bleed screw for dump operation. 6. Hose assembly to rod end of left lift cylinder. 7. Hose assembly to rod end of right lift  cylinder. 5. 6. 7. 8. 9. 10. 11. 12. 13. Move  the  tilt  control  lever  to  TILT  BACK position. Loosen  (open)  bleed  screw  (2).  Keep  it  open until there is a constant flow of oil (no air bub- bles)  from  bleed  screw  (2). Tighten  (close)  bleed  screw  (2).  Release  the  tilt control  lever. Move  the  tilt  control  lever  to  DUMP  position. Open bleed screw (5). Keep it open until there is a  constant  flow  of  oil  (no  air  bubbles)  from  the bleed screw. Close  bleed  screw  (5).  Release  the  tilt  control lever. Move  the  lift  control  lever  to  RAISE  position. Open bleed screw (3). Keep it open until there is a  constant  flow  of  oil  from  the  bleed  screw. Close bleed screw (3). Move the lift control lever to   HOLD.