TM 10-3930-669-34 (4) Inspect rod for scratches or pitting.  Remove minor scratches and pitting by using stone and lubrication oil. (5) Inspect component threads for burrs and stripped threads.  Replace or repair as necessary. c. Assembly. NOTE Coat  all  internal  parts  with  hydraulic oil before assembly. (1) Position mast primary cylinder (1) in chain vise. (2) Install flow cartridge (14) in cylinder (1). (3) Install  seal  (13),  two  wear  rings  (12),  and  wiper (11) in cylinder (1). (4) Install seal (10) and button screw (9)  in  cylinder (1). 15-49