Phenomena That Are Not Failures - Komatsu PC300LC-8 Operation & Maintenance Manual

TROUBLES AND ACTIONS

PHENOMENA THAT ARE NOT FAILURES

Note that the following phenomena are not failures:
When the arm control lever is operated to the IN position and the
work equipment is lowered under no load from a high position,
the arm speed will drop momentarily when the arm is more or
less at the vertical position.
When the bucket control lever is operated to the CURL position
and the work equipment is lowered under no load from a high
position, the bucket speed will drop momentarily when the
bucket teeth are more or less at the horizontal position.
The bucket or arm will fluctuate by itself during heavy-duty
digging operations.
When starting or stopping the swing, noise will be emitted from the brake valve.
When going down a steep slope at low speed, a noise will be emitted from the travel motor brake valve.
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OPERATION