OPERATING PROCEDURES GRT8120 OPERATOR MANUAL
4-24 Published 3-22-2021, Control # 702-02
unlocks the boom section from the supporting boom
section so it can be moved. The operator can then
extend the boom section by moving the controller in the
extend direction or retract it by moving the controller in
the retract direction. As the boom section nears the 0%,
50%, 92% or 100% locking positions it automatically
slows down. When the boom section is at a locking
position the icon to lock appears. If the operator selects
Lock the CCS will lock and “set down” the boom section.
After the boom section has been locked the symbol to
unlock the cylinder appears. If the operator selects the
symbol to unlock the telescoping cylinder it will
disengage the boom section and move to the next boom
section. When it arrives at the next boom section it will
lock the cylinder to the section and then automatically
unlock the boom section from the supporting boom
section.
• Emergency Mode is used to move the telescoping
system for maintenance and service work, as well as
when an issue occurs that affects the other telescoping
modes. The Emergency Mode has two levels of access.
The first level is the basic emergency mode, which is to
be used to service or repair the telescoping system. The
basic emergency mode can only be used when the
boom is fully retracted to extend the Tele 1 section to the
50% pinning position. The telescoping cylinder may then
be unlocked from Tele 1 and retracted to the
maintenance hole in the Base section.
Moving the boom for all other reasons must be done in
the extended emergency mode, which requires a special
access code. In the Emergency Mode the operator has
control over the locking and unlocking functions of the
telescoping cylinder. The operator can also retract or
extend the telescoping cylinder. The operator or
technician may also see the sensor information for the
complete telescoping system.
The operator must use the telescope controller with the
automatic and manual telescope modes in the ODM to
telescope the boom.
Extending the Boom
Dual Axis Controller (Crane not Equipped with Auxiliary
Hoist)
1. Push the Telescope Enable/Disable Switch on right
arrest to enable the boom telescope function.
The Telescope Enable Indicator in the Status Bar area
(Figure 4-73) of the Operator Display Module (ODM) will
come on (green).
2. Push controller on left armrest forward and hold to
extend the boom.
3. When boom gets to the desired length, let controller
return to the center (neutral) position to stop extending
the boom.
Dual Axis Controller (Crane Equipped with Auxiliary Hoist)
1. Push the Telescope Enable/Disable Switch on right
armrest to enable the boom telescope function.
The Telescope Enable Indicator in the Status Bar area
(Figure 4-73) of the Operator Display Module (ODM) will
come on (green).
2. Push controller on right armrest to the right and hold to
extend the boom.
3. When boom gets to the desired length, let controller
return to the center (neutral) position to stop extending
the boom.
DANGER
Crushing Hazard!
Check Load Chart Manual for maximum load at a given
radius, boom angle, and length before extending boom
with a load.
DANGER
Two-Block Hazard
To avoid death or serious injury, keep load handling
devices away from the tip of the boom or boom extension
when extending or lowering the boom and when hoisting
up.
When extending boom, simultaneously let out hoist rope
to prevent two-blocking the boom nose and the hook
block.
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