A mobile apparatus, comprising: a mobile carriage; a pedestal supported by said mobile carriage; a boom having a proximal portion coupled to said pedestal, said boom defining a lumen; an implement connection apparatus rotatably connecting a pressurized fluid-driven implement to a distal portion of said boom for rotation of said implement about an actuator axis, said implement connection apparatus being characterized by: (i) a rotary actuator having a housing defining a chamber, a shaft having first and second ends (72, 74) and extending axially through said chamber for rotation relative to said housing about said actuator axis, said shaft being rotated by a translator mechanism that is axially driven parallel to said actuator axis in said chamber; and (ii) a pressurized fluid circuit for delivery of pressurized fluid through said rotary actuator (60 to said implement, said circuit having a feed manifold at said first end of said shaft, a delivery manifold at said second end of said shaft, and first and second channels (110, 112) fluidically coupling said feed manifold to said delivery manifold axially through said shaft, wherein said feed and delivery manifolds (106, 108) are rotatable with said shaft relative to said housing; (iii) said implement connection apparatus being connected to said boom with said feed manifold positioned within said boom lumen. a mobile carriage; a pedestal supported by said mobile carriage; a boom having a proximal portion coupled to said pedestal, said boom defining a lumen; an implement connection apparatus rotatably connecting a pressurized fluid-driven implement to a distal portion of said boom for rotation of said implement about an actuator axis, said implement connection apparatus being characterized by: (i) a rotary actuator having a housing defining a chamber, a shaft having first and second ends (72, 74) and extending axially through said chamber for rotation relative to said housing about said actuator axis, said shaft being rotated by a translator mechanism that is axially driven parallel to said actuator axis in said chamber; and (ii) a pressurized fluid circuit for delivery of pressurized fluid through said rotary actuator (60 to said implement, said circuit having a feed manifold at said first end of said shaft, a delivery manifold at said second end of said shaft, and first and second channels (110, 112) fluidically coupling said feed manifold to said delivery manifold axially through said shaft, wherein said feed and delivery manifolds (106, 108) are rotatable with said shaft relative to said housing; (iii) said implement connection apparatus being connected to said boom with said feed manifold positioned within said boom lumen. (i) a rotary actuator having a housing defining a chamber, a shaft having first and second ends (72, 74) and extending axially through said chamber for rotation relative to said housing about said actuator axis, said shaft being rotated by a translator mechanism that is axially driven parallel to said actuator axis in said chamber; and (ii) a pressurized fluid circuit for delivery of pressurized fluid through said rotary actuator (60 to said implement, said circuit having a feed manifold at said first end of said shaft, a delivery manifold at said second end of said shaft, and first and second channels (110, 112) fluidically coupling said feed manifold to said delivery manifold axially through said shaft, wherein said feed and delivery manifolds (106, 108) are rotatable with said shaft relative to said housing; (iii) said implement connection apparatus being connected to said boom with said feed manifold positioned within said boom lumen.