Figure 3-105. Boom hoist hydraulic brake cylinder, removal and installation.
Section XVIII. ROTATING BASE (REVOLVING FRAME)
3-124. General
Warning:
Never travel crane-shovel basic unit
The rotating base (revolving frame) of the crane-shovel
(less front end attachment) over
unit is the mounting base for all operating components
rough terrain with counterweight
including front end attachments, engine, hoisting
extension installed. The unit could
mechanism, and cab. The revolving frame derives
tip over backward, causing damage
swing power through a vertical swing shaft and revolves
to the unit, and possible injury to the
on rollers traveling in the roller circle. Front and rear
operator.
hook rollers are provided to reduce strain on center
gudgeon, while 8,250 pounds of counter weight slugs in
3-125. Front Hook Rollers
box plus the counterweight extension, provides stability
a. Removal and Installation.
during swinging operation. Keep the hook rollers in
(1) Lower boom to approximate horizontal
proper adjustment at all times (para 3-39).
position.
3-117
