TM 10-3930-669-20 WARNING •  High-pressure hydraulics [oil under 3,000 psi (20,700 kPa) pressure] operate this equipment.  Refer to vehicle operator and  maintenance  manuals  for  hydraulic  oil  pressure.    Never  disconnect  any  hydraulic  line  or  fitting  without  first dropping pressure to zero.  Failure to comply may result in injury to personnel. • Hydraulic oil is slippery and can cause falls.  To avoid injury, wipe up spilled oil with rags. VISUAL INSPECTION (1) Open right-hand engine access cover (TM 10-3930-669-10). (2) Inspect stack valve pivot hoses and fittings from stack valve pivot spool to pivot cylinder for looseness and damage. (a) If pivot hose fittings are loose, tighten fittings. (b) If hose(s) and/or fittings are damaged, replace hose(s) and/or fittings (Para 17-10). (c) If hose(s) and fittings are not loose or damaged, hoses are OK. (3) Close right-hand engine access cover. VISUAL INSPECTION Inspect pivot control cable for damage. (a) If cable is damaged, replace pivot control cable (Para 17-2). (b) If cable is not damaged, adjust cable (Para 17-2). (c) If cable is not damaged or unadjusted, cable is OK. 2-439