Komatsu PC400LC-5 Operation & Maintenance Manual page 108

Prohibited operations using dropping force of machine
Do not use the dropping force of the machine for digging.
Digging rocky ground
It
is better to excavate hard rocky ground after breaking it up by
some other means. This will not only reduce damage to the machine
but make for better economy.
Sudden lever shifting during Hi-speed travel prohibited
@ Never carry out sudden lever shifting as this may cause sudden
starting.
@ Avoid sudden lever shifting from forward to reverse (or vice
versa).
@ Avoid sudden 'lever shifting change such as sudden stopping
from near top speed (lever release operation).
NCORRECT
AE09793;
NCORRECT
INCORRECT
Forward
Neutral
AE082620
NOTICE
Note that the following phenomena are not faults:
l When the arm is pulled back, it will sometimes stop when
becomes more or less vertical.
l
The arm may sometimes stop when the bucket teeth become
more or less horizontal.
l
At the beginning and end of a swinging, a noise may sometimes
be emitted from the brake valve.
l When descending a steep slope at low
speed,
a noise may
sometimes be emitted from the travel motor.
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