TM 10-3930-669-34 15-5. TILT CYLINDER REPAIR (CONT). (9) Position cylinder (3) in chain vise. CAUTION Keep  rod  straight  and  concentric  in cylinder.        Do    not    allow    piston    to become wedged in cylinder or damage   to   cylinder   or   piston   may occur. (10)  Install piston (11), rod (4), and head (7) in cylinder (3). (11)  Push head (7) back in cylinder (3) until shear ring groove is seen. (12)  Install shear ring (8) in cylinder (3). WARNING Use  extreme  care  when  removing  or installing springs and retaining rings. Springs and retaining rings are under tension   and   can   act   as   projectiles when    released    suddenly.        Ensure proper    eye    protection    is    worn    to prevent injury to personnel. NOTE Shear   ring   will   prevent   head   from coming out of cylinder. (13)  Pull   rod   (4)   out   of   cylinder   (3)   until retaining   ring   groove   of   head   (7)   is seen. (14)  Install spacer (6) and retaining ring (5) in cylinder (3) and head (7). 15-36