TM 10-3930-675-20-1 0006 00-22 TROUBLESHOOTING PROCEDURES (NON-ERROR CODE) - CONTINUED 0006 00 Table 7. Boom System Troubleshooting Procedures (Non-Error Code). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1.   Boom Will Not Lift or Lower Properly. 1.  Access maintenance ECS display  and  check  for  active hydraulic or electrical system error codes (WP 0004 00). 2.  Ensure that hydraulic oil level is within operating range (LO 10-3930-675-12). Fill hydraulic oil as required (LO 10-3930-675-12). 3.  Inspect     lift     cylinders     for obstructions,     damage,     and signs of leakage. a.  Remove any obstructions. b.  Notify   DS   Maintenance   to replace  damaged  or  leaking lift cylinders. 4.  Check  lift  cylinder  hydraulic lines and hoses for damage and signs of leakage. a.  Tighten loose connections. b.  Replace  damaged  or  leaking lines and hoses (WP 0180 00). 5.  Ensure     that     lift     cylinder emergency and float valves are in closed position. Close emergency and float valves as  required  (TM  10-3930-675- 10). 6.  Check cab position proximity switches for obstructions, damage, and proper adjustment. Clean,   replace   or   adjust   cab position  proximity  switches  as required (WP 0075 00). 7.  Test  boom  system  operating pressure  (WP  0186  00,  test point no. 8). Operating pressure  should  be  3480  psi (240 bar). a.  Notify   DS   Maintenance   to replace    boom    and    brake system   hydraulic   pump   if pressure is not as specified. b.  Notify   DS   Maintenance   to replace   main   control   valve assembly. 8.  Check boom calibration settings (WP 0197 00). Calibrate boom as required (WP 0197 00). 2.   Boom Will Not Extend or Retract Properly. 1.  Access maintenance ECS display  and  check  for  active hydraulic or electrical system error codes (WP 0004 00). Perform  troubleshooting  proce- dures to clear diagnostic code(s) (WP 0005 00). 2.  Ensure that hydraulic oil level is within operating range (LO 10-3930-675-12). Fill hydraulic oil as required (LO 10-3930-675-12). NOTE Extension cylinder leaks appear to be coming from inside boom assembly. 3.  Inspect extension cylinder for damage and signs of leakage. Notify SRA.