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RETRACTION ENGINE AND DRIVE SYSTEMS
RETRACTION ENGINE MANIFOLD - 14310_171

Aviation Boatswains Mate E - Aviation theories and other practices
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HYDRAULIC MOTOR The hydraulic motor (see fig. 4-43) is rotated by pressurized fluid from the main hydraulic accumulator. Various directional valves located on the retraction engine manifold control speed and direction of rotation. The hydraulic motor is coupled directly to the drum assembly, causing the drum to rotate in the same direction and speed as the motor. DRUM ASSEMBLY The   drum   is   a   grooved,   cylindrical   shaped   as- sembly  which  winds  and  unwinds  the  drive  system cables  to  either  advance  or  retract  the  grab,  based  on directional rotation of the hydraulic motor. The drum is directly coupled to the hydraulic motor and is geared to the screw and traverse carriage installation. SCREW AND TRAVERSE CARRIAGE INSTALLATION The  screw  and  traverse  carriage  installation  (fig. 4-44) is mounted on the retraction engine frame above the drum and is driven by a gear arrangement connected to  the  drum.  Rotation  of  the  drum  causes  the  traverse carriage  to  slide  along  tracks  mounted  on  the  engine frame.  A  sheave  and  adapter  assembly,  bolted  to  the carriage  body,  acts  as  a  guide  for  the  advance  and retract cables as they wind and unwind on and off the drum preventing the cables from becoming tangled. As the  carriage  assembly  moves  along  the  length  of  the retraction engine, cams mounted on top of the carriage body   come   in   contact   with   valves   and   switches mounted within the retraction engine frame. The cams actuate  the  advance  and  retract  dump  valves,  advance and  retract  cutoff  limit  switches,  grab  fully  aft  limit 4-36 TRACK SHEAVE AND ADAPTER ASSEMBLY CAMS SCREW SHEAVE AND ADAPTER ASSEMBLY DRUM GEARING ABEf0445 Figure 4-44.—Screw and traverse carriage.







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