TM 10-3930-669-20 17-10.  MAIN HYDRAULIC SYSTEM HOSE AND TUBE REPLACEMENT (CONT). a.  Mast Hydraulic Hose Replacement. (1) Removal. (a)   Remove hose (1) and two preformed packings (2) from secondary cylinder manifolds (3 and 4).  Discard preformed packings. (b)   Remove tube (5) and two preformed packings (6) from secondary cylinder regulator valve (7) and adapter (8).  Discard preformed packings. (c)   Remove hose (9) and preformed packing (10) from adapter (8) and manifold (11).  Discard preformed packing. (d)   Remove hose (12) and two preformed packings (13) from primary cylinder manifold adapter (14) and secondary cylinder manifold (4).  Discard preformed packings. 17-36