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9. NORMAL OPERATION OF EXCAVATOR
Followings may occur during operation due to the
nature of a hydraulic excavator.
1)
When rolling in the arm, the roll-in movement stop
momentary at point X in the picture shown, then
recovers speed again after passing point X.
The reason for this phenomenon is that
movement by the arm weight is faster than the
speed of oil flow into the cylinder.
When lowering the boom, one may hear
2)
continuous sound.
This is caused by oil flow in the valve.
Overloaded movement will produce sound caused
3)
by the relief valves, which are for the protection of
the hydraulic systems.
When the machine is started swing or stopped, a
4)
noise near the swing motor may be heard. The
noise is generated when the brake valve relieves.
4-22
D11074OP36
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