TM 10-3930-669-20 (3) Remove  fitting  (4),  preformed  packing  (5),  flow regulator  (6),  and  preformed  packing  (7)  from secondary    cylinder    (8).        Discard    preformed packings. b.  Installation. (1) Install preformed packing (7), flow regulator (6), preformed    packing    (5),    and    fitting    (4)    on secondary cylinder (8). (2) Install   extension   tube   (2)   on   fitting   (4)   and tighten fitting (3). (3) Tighten clamp (1) on extension tube (2). NOTE Follow-on Maintenance: · Connect batteries (Para 7-48). · Check hydraulic fluid (LO 10- 3930-669-12). · Remove wheel chocks (TM 10- 3930-669-10). END OF TASK 17-21