TM 10-3930-669-34 15-3. STACK VALVE REPLACEMENT/REPAIR (CONT). NOTE Springs may fall when valves are separated. (17)  Separate  inlet  (65),  pivot  valve  (66),  tilt  valve  (67),  mid-inlet  (68),  shift  valve  (69),  lift  valve  (70),  and outlet (71). (18)  Remove six preformed packings (72) from pivot valve (66), tilt valve (67), mid-inlet (68), shift valve (69), and lift valve (70).  Discard preformed packings. NOTE Tag and mark poppet valves upon removal. (19)  Remove four springs (73) and poppet valves (74, 75, 76, and 77) from pivot  valve  (66),  tilt  valve  (67), shift valve (69), and lift valve (70). 15-18