Manitowoc Grove GRT8120, Operator'S Manual

Page: 102 / 448

OPERATING CONTROLS AND FEATURES GRT8120 OPERATOR MANUAL
3-28
Published 3-22-2021, Control # 702-02
Swing Controller
The Swing Controller (1, Figure 3-13) is located on the left
armrest.
Push controller forward to cause the superstructure to rotate
c l o c k w i s e . P u l l c o n t r o l l e r r e a r w a r d t o c a u s e t h e
superstructure to rotate counterclockwise.
The superstructure can be continuously rotated 360° in the
desired direction.
Telescope or Auxiliary Hoist Controller
The Telescope Controller (2, Figure 3-13) is located on the
left armrest.
Push controller forward to extend the boom. Pull controller
rearward to retract the boom.
When the The Auxiliary Hoist Controller (2, Figure 3-13) is
located on the left armrest.
Push controller forward to extend the boom. Pull controller
rearward to retract the boom.
Boom Lift – Telescope – Luffing Boom
Extension Controller
The Boom Lift – Telescope – Luffing Boom Extension
Controller (3, Figure 3-13) is located on the right armrest.
Operator must enable the boom lift or telescope function
using the related Enable/Disable Switch for the function to
operate.
Only one function can be enabled at a time.
When the Boom Lift function is enabled, push controller
forward to lower the boom. Pull controller rearward to raise
the boom.
When Telescope function is enabled, push controller forward
to extend the boom. Pull controller rearward to retract the
boom.
When crane is equipped with an optional luffing boom
extension, the luffing boom extension function is also
operated by the Boom Lift – Telescope – Controller.
Operator must enable the luffing boom extension function
using the related Enable/Disable Switch for the function to
operate.
Again, only one function can be enabled at a time.
When used for the luffing boom extension function, push
controller forward to lower the boom extension. Pull
controller rearward to raise the boom extension.
Main Hoist Controller
The Main Hoist Controller (4, Figure 3-13) is located on the
right armrest.
Push controller forward to lower the hoist rope. Pull controller
rearward to raise the hoist rope.
Hoist Rotation Indicators (Not Shown)
Hoist Rotation Indicators (5, Figure 3-13) for auxiliary and
main hoists are located on top of each single-axis hoist
controller (1, 3, Figure 3-13).
The Hoist Rotation Indicator pulses on the auxiliary or main
hoist controller (1, 3) when its related hoist is operating.
The pulsing, felt by the operator’s hand, indicates to the
operator that the hoist is operating.
The Hoist Rotation Indicator also makes an audible click
when it pulses.
The frequency of the pulses and clicks increases and
decreases as the hoist speed increases and decreases.