TM 10-3930-643-34 HYDRAULIC  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 12-15. Fork Position Cylinders (S/N 2000 and below). (Sheet 10 of 10) TESTING Only a qualified operator may perform  the  next  procedure. All other  personnel  must clear the immediate  area. Failure  to  follow 53. 54. 55. 56. 57. 58. 59. this  procedure  could result in SERIOUS  INJURY  or  DEATH.  If injured, obtain medical aid immediately. Start engine. Operate fork position cylinder slowly. Move fork position cylinder through at least five full movements of travel to bleed air from system. Check for binding in operation of hydraulic  cylinders  and  vehicle. Stop engine. Inspect hydraulic fluid tubes, fittings  and  cylinder  assemblies  for leaks. Check hydraulic fluid level again. Add hydraulic fluid, if necessary, refer to LO 10-3930-643-12. NOTE Return  M10A  Forklift equipment  condition. to  original END OF TASK 12-141