GTZZ14EJ&16EJ Maintenance Manual
47
© May 2023
6 BOOM AND PLATFORM ASSEMBLY
6.1 BOOM AND PLATFORM
SYSTEM
Platform Control Enable System
The platform control system uses time-dependent sup-
port circuits to limit the time availability of active or en-
abled controllers. The foot switch must be depressed
before any movement can be performed. When the foot
switch is depressed, the controller will be activated and
the operator can perform any movements within 7s. The
controller will remain enabled as long as the operator
keeps operating any functions until 7s after the last func-
tion stops. When the controller is active, the indicator on
the platform display panel will light up. After the set time,
the illuminated indicator will turn off and the controller
will turn off or be disabled. To continue to operate the
machine, the controller must be re-enabled to start the
timing system again. To activate the timing system
again, follow these steps: release all control buttons,
handles, and foot switch, and then depress the foot
switch again.
Transport Position Sensing System
The transport position sensing system can detect the
position of the boom by means of the travel switch
mounted on the boom tube. When the down limit switch
of the main boom or the articulated boom is not en-
gaged, or the retraction limit switch of the main boom is
not engaged, the machine is considered as in operating
position; otherwise, it is considered as in non-operating
position.. The position of the jib boom is not taken into
account.
This system is used to control the travel speed reduction
system.
Load Sensing System
The load sensing system on this machine detects the
load on the platform through the load cell installed at the
connection between the platform and the boom tube.
The overload indicator on the platform display panel in-
dicates if the platform load has exceeded the rated load.
When the load sensing system detects that the platform
load exceeds the rated load, the overload indicator will
flash, and all movements of the machine will be re-
stricted in the KG (overload limit) mode; while in other
modes, the telescopic boom will be allowed to retract,
the turntable can rotate slowly, and the boom can be
lowered after the telescopic boom is fully retracted. After
the excess load is removed, the overload indicator will
go out and all machine movements will be resumed.
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