00 Index and foreword
SEN00094-05
PC200, 220-8
19
5.
Change hydraulic oil when the 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 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
carried out twice: primary flushing is carried
out with flushing oil, and secondary flushing is
carried out with the specified hydraulic oil.
7.
Cleaning operations
After repairing the hydraulic equipment (pump,
control valve, etc.) or when running the
machine, carry out oil cleaning to remove the
sludge or contaminants in the hydraulic oil cir-
cuit. The oil cleaning equipment is used to
remove the ultra fine (about 3
m
) particles that
the filter built in the hydraulic equipment can-
not remove, so it is an extremely effective
device.
