OPERATING PROCEDURES GRT8120 OPERATOR MANUAL
4-134 Published 3-22-2021, Control # 702-02
The remaining proximity switches, S2114N and S2115N, are
for the cylinder pins being retracted, so they are shown in a
column format to be logical with respect to their location on
the tele cylinder.
Figure 4-129 has further explanation for the telescoping
emergency program screen. Item 1 is the graphical
representation of the tele cylinder pins that connect to a
telescoping boom section. When these cylinder pins are
considered retracted, an unlock symbol will appear in this
location.
Item 2 is the graphical representation of the boom section
and its pins that connect to the next telescoping boom
section. Note that in the telescoping emergency program;
the actual boom section is no longer able to be determined;
the crane operator must determine this. When these section
pins are considered retracted (at least the actuator has
moved to attempt this), an unlock symbol will appear in this
location.
Item 3 is the indicator for a command to attempt to retract the
cylinder pins. The arrow buttons on the display or the jog dial
can be used to highlight this, and hitting the OK/Enter button
will then attempt to execute the command. The lock/unlock
symbol on the button does not change based on the cylinder
operations (refer to Items 1 and 2).
Item 4 is the indicator for a command to release or re-extend
pins. This command works for both the cylinder pin retracting
and the section pin retracting; they are connected to the
same double-acting hydraulic actuation cylinder, so it can
only release the pins that had been previously retracted
(whichever they were). The arrow buttons on the display or
the jog dial can be used to highlight this, and hitting the
OK/Enter button will then attempt to execute the command.
The lock/unlock symbol on the button does not change
based on the cylinder operations (refer to Items 1 and 2).
Item 5 is the indicator for a command to attempt to retract the
section pins. The arrow buttons on the display or the jog dial
can be used to highlight this, and hitting the OK/Enter button
will then attempt to execute the command. The lock/unlock
symbol on the button does not change based on the cylinder
operations (refer to Items 1 and 2).
CAUTION
Machine Damage Hazard!
Telescoping the main boom when there is an error on the
precision length indication and malfunctioning proximity
switches can result in damage to the main boom, contact
Manitowoc Crane Care or your Local Distributor to
determine if you are permitted to start the telescoping
process. They can provide the passcode to use in the
telescoping emergency program with extended
capabilities.
A situation could arise in which the main boom can no
longer be extended or retracted.
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