Komatsu PC450-8 Operation & Maintenance Manual page 438

HIGH REACH DEMOLITION EQUIPMENT 27M
OPERATION
Always use the boom within the range shown by the hatched area
in the diagram below. If the boom goes below posture (1), the
alarm buzzer will sound. If the alarm buzzer sounds, return the
boom to a position where the buzzer stops.
Boom inclination gauge
Green
Red
range
range
1
Boom
A
If the alarm buzzer does not sound when the boom is below the
specified angle (inclination gauge in red range), make sure that
the boom angle alarm buzzer switch (A) is set so that the alarm is
active. If the button is set correctly, adjust the angle sensor plate
as follows.
A
c
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