5-28 Published 3-22-2021, Control # 702-02
SET-UP AND INSTALLATION GRT8120 OPERATOR MANUAL
Boom Extension Alert and Warning Screens
During the deployment and stowage of the boom extension,
the Crane Control System (CCS) uses five proximity
sensors, in addition to the Boom Extension Pin Interlock
Mechanism, to help ensure that the boom extension is
supported and secure during deployment and stowage. The
CCS can use these same systems to help identify when a
sensor has malfunctioned. (Refer to the section titled Boom
Extension Sensors, page 5-25 for information on these
proximity sensors. Refer to the section titled Boom Extension
Pin Interlock Mechanism, page 5-21 for information on the
interlock system.)
If the sensors identify an inconsistency relative to normal
operation, one of two possible warning screens will appear.
If a screen shows with three question marks (Figure 5-31),
the system has identified that either Pin 1 or Pin 2 is not in
the proper locked/unlocked condition for the activity taking
place. This can result in damage to the boom extension or
boom extension stowage system.
DANGER
Boom Extension Hazard
Using the override feature of the controls to operate pin 1
or pin 2 could result in the boom extension becoming
unsecured and falling. Death or Serious Injury could
occur.
CAUTION
Possible Crane Damage
If Pin 1 or Pin 2 is not in the proper locked/unlocked
condition for the activity taking place, the boom extension
or boom extension stowage system can be damaged
during stowage.
Always make sure Pin 1 and Pin 2 are unlocked before
swinging the boom extension into the front and rear
stowage brackets.
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