TM 10-3930-669-34 (4) Install  preformed   packing   (18),   expansion   ring (17), and preformed packing (16) on piston (9). (5) Install spacer (4) and shear ring (6) on rod (2). (6) Install head (5) on rod (2). (7) Install  piston  (9)  and  lock  nut  (15)  on  rod  (2). Tighten   lock   nut   to   250   to   300   Ib-ft   (339-407 N•m). (8) Install clevis (14) on rod (2). (9) Install screw (13) and nut (12) in clevis (14).  Do not tighten nut and screw. 15-43