OPERATING PROCEDURES GRT8120 OPERATOR MANUAL
4-106 Published 3-22-2021, Control # 702-02
Locking the Superstructure
1. Swing the superstructure to the desired position.
2. Maintain superstructure position by pressing and
holding the swing brake pedal.
3. Using the Jog Dial or the Arrow Buttons on the
Navigation Control Pad, select the Lock icon
(2, Figure 4-105).
4. Press the Jog Dial or the OK Button to start the locking
process.
When the lock is engaged, the Locked Status Indicator
(4, Figure 4-106) will appear.
Unlocking the Superstructure
1. Press and hold the swing brake pedal.
2. Using the Jog Dial or the Arrow Buttons on the
Navigation Control Pad, select the Unlock icon
(3, Figure 4-105).
3. Press the Jog Dial or the OK Button to start the locking
process.
When the lock is disengaged, the Unlock Status
Indicator (4, Figure 4-105) will appear.
Boom Extension Deployment/Stowage
Select the Boom Extension Deployment/Stowage icon
(1, Figure 4-107) under the Crane Function Group to show
the Boom Extension Deployment/Stowage function screen.
The Boom Extension Deployment/Stowage function screen
is used to extend and retract the front and rear boom
extension pins that secure the boom extension to the boom
base section.
Complete procedures for the deployment and stowage of the
boom extension, including the use of the Boom Extension
Deployment/Stowage function screen, are found in the
section titled Boom Extension, page 5-20.
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