MAINTENANCE OF THE HYDRAULIC SYSTEM
Section I. HYDRAULIC CYLINDERS
3-2. Feed Tilt Cylinder Removal and
The pneumatic rock drill is equipped with five
hydraulic cylinders, one each for feed lift, boom
lift, feed swing, boom swing, and feed extension.
(1) Lower the rock drill feed mechanism to
All hydraulic cylinders are double acting and self-
rest on the ground.
locking when not in operation. Additional
( 2 ) Loosen hose connections and allow
protection is provided by pilot check valves that
hydraulic oil to bleed into a container.
p r e v e n t cylinder movement, except when in-
(3) Remove the
tended or in the event of line breakage.