
31200243 83
Operation Section
machine stability. The variable gauge is located in the
center of the display panel.
As the load on the machine increases, the indicator
moves through the green zone toward the red zone of
the gauge.
The scale on the gauge has three colored zones.
Green Zone (25) - The machine is operating within the
limit of forward longitudinal stability.
Amber zone (26) - The limit for the forward
longitudinal stability of the machine has been reached or
exceeded.
Red zone (27) - The limit for the forward longitudinal
stability of the machine has been exceeded.
When the visual indicator (24) enters the amber zone
an audible alarm will sound continuously and a visible
warning lamp (2) will begin to light. This audible signal
indicates that the limit of longitudinal stability has been
reached or exceeded. When this condition occurs,
do not proceed with the lift operation. Retract the
boom if the boom is extended. If the boom is retracted,
return the load to the original position. If the indicator is
not in the amber zone or the red zone, the alarm may be
caused by another system. Check the other gauges for
the indication of other problems. Change the operation
of the machine.
Extending the boom or lowering a raised boom further
increases the outreach of the load. This can reduce
the forward stability of the machine. Machine tip over
could result. If the longitudinal stability indicator shows
that the machine stability limit is being approached, do
not lower or further extend the boom. Retract the boom
before lowering. Machine tip over could cause personal
injury or death to the operator or other personnel in the
work area.
The visual indicator (24) and the audible alarm may
operate momentarily when the machine is traveling
with a load on the work tool. This may occur more
frequently on uneven ground or rough terrain. Turning
the steering system onto the full lock may also cause
unexpected operation of the visual alarm and the
audible alarm.
When the ignition of the machine is turned from the
OFF position to the ON position, the machine will
perform the system test for the LSI. Refer to Operation
and Maintenance Manual, "Longitudinal Stability
Indicator System - Test" for more information. If the
system passes the test for the LSI, the machine may be
operated as normal.
If the LSI system should detect a problem, the
machine will fail the system test. This will cause
indicator (24) to hold in the red zone (27). An
intermittent audible alarm will sound and the warning
lamp will be illuminated. Refer to Operation and
Maintenance Manual, "Longitudinal Stability Indicator
System - Test" for more information if the test fails.
Another function of the system is the auto adjustment.
When the machine is turned from the OFF position to
the ON position, the machine will perform an
automatic adjustment of the LSI. This adjustment will
depend on the state of the machine upon turning the
ignition to the ON position. For optimum performance of
the LSI system, the machine should be parked in the
following manner:
• Park the machine on level ground.
• Fully retract the boom.
• If equipped, fully raise the stabilizers.
• Fully lower the boom.
• Unload the work tool and gently rest the work tool
on the ground.
• Remove the trailer from the hitch.
The LSI system will be more sensitive if the machine is
not parked in this manner. The LSI will enter the amber
zone and the alarm will be activated with lighter loads
on the work tool.
In order to return the system to optimum performance,
perform the following actions:
• Park the machine in the state that is mentioned
above.
• Turn the ignition to the OFF position.
• Wait for 30 seconds.
• Start the machine and resume operation.
If any changes are made to the standard machine
configuration of the Telehandler, the system may need
to be recalibrated. Consult your Caterpillar dealer for
recalibration of the LSI.
The following situations are conditions that require
recalibration:
• The type of wheels on the rear axle are changed.
• The type of tires on the rear axle are changed.
• The tire foam fill is added to the tires.
• The rear axle is changed.
• The sensor for the LSI is changed.
The full test, which is stated in Operation and
Maintenance Manual, "Maintenance Interval
Schedule", must be followed.
Backup Alarm
The backup alarm is located on the rear of the
machine. The alarm sounds when the transmission
direction and speed control lever is in the REVERSE
position. The backup alarm is used to alert people
behind the machine.