TM  10-3930-643-34 HYDRAULIC  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 12-12. Lift Cylinder. (Sheet 10 of 10) INSTALLATION 65. 66. 67. 68. 69. 70. Check  and  refill  hydraulic  reservoir, refer  to  TM  10-3930-643-12. Operate  engine  until  hydraulic  fluid is  at  normal  operating  temperature. Move  lift  cylinder  through  at  least five full movements of travel to bleed air from system. Check  for  binding  in  lift  cylinder operation. Stop engine. Inspect  hydraulic  hoses,  fittings  and cylinder assemblies for leaks. ^- TESTING 71. 72. 73. 74. 75. 76. Lower forks to the ground. Using a 9/16”   socket  and  socket  wrench handle,  disconnect  hoses  from  left side lift cylinder and cap hoses. Disconnect  hose  from  lower  end  of  right side lift cylinder and cap hoses. Operate engine at 2625 to 2750 rpm and move  lift  control  lever  to  maximum LOWER  position. Observe lower port. Continuous fluid flow  from  port  indicates  defective packing. Replace packing if defective. Connect hoses. NOTE Return  M10A  Forklift  to original  equipment  condition. END OF TASK 12-110