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Foreword and general information
Handling of hydraulic components
5. Replacing hydraulic oil while its temperature is high
When hydraulic oil or other oil is warm, it flows
easily.
In addition, the sludge can also be
drained out easily from the circuit together with
the oil, so it is best to change the oil when it is still
warm. When changing the oil, as much as
possible of the old hydraulic oil must be drained
out. (Drain the oil from the hydraulic tank; also
drain the oil from the filter and from the drain plug
hole in the circuit.) If any old oil is left, the
contaminants and sludge in it will mix with the
new oil and will shorten the life of the hydraulic
oil.
6. Flushing operations
After disassembling and assembling the equip-
ment, or changing the oil, use flushing oil to
remove the contaminants, sludge, and old oil
from the hydraulic circuit. Normally, flushing is
performed twice. Primary flushing is performed
by use of flushing oil and secondary flushing is
performed by use of the specified hydraulic oil.
7. Cleaning operations
After repairing the hydraulic equipment (pump,
control valve, etc.) or when running the machine,
perform oil cleaning to remove the sludge or
contaminants in the hydraulic oil circuit. The oil
cleaning equipment can remove the ultra fine
(about 3 m) particles that the filter built in the
hydraulic equipment cannot remove, so it is an
extremely effective device.
00-22
PC600, 650, 700-8E0
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