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Handling of hydraulic equipment
With the increase in pressure and precision of the hydraulic components, the most common cause of a
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failure is dirt (foreign material) in the hydraulic circuit. Therefore, the special care must be taken when add-
ing hydraulic oil,or when disassembling or assembling the hydraulic components.
Be careful of working environment
Avoid adding hydraulic oil, replacing filters, or re-
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pairing the machine in rain or high winds, or at
places where there is a lot of dust.
Disassembly and maintenance work in the field
When disassembly or maintenance work of the
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hydraulic is performed in the field, there is dan-
ger of dust entering the components. It is also
difficult to check the performance of the compo-
nents after repairs, so it is desirable to use the
component exchange service. The disassembly
and assembly of the hydraulic components must
be performed in the specially arranged dustproof
workshop and the performance test of the com-
ponents must be performed with the special test-
ing equipment.
Plugging of opening (prevention of flowing out
of oil)
Plug the pipes and the openings of the compo-
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nents which are removed (when plugs are not
prepared, seal with caps, tapes, vinyl bags, etc.)
to prevent entry of foreign material and flowing
out of oil. Never leave the openings of the pipes
and hoses without being covered or plugged
with cloth as foreign material may enter them or
environment may be polluted by the oil leaked.
Do not discard the waste oil somewhere or other.
Hand it over to your customer for disposal, or
dispose it by yourself.
WA200-7
Preventing intrusion of foreign materials during
refilling operations.
Care must be taken when adding hydraulic oil so
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that foreign material does not enter. Keep the oil
filler port and the area around it, oil supply pump
and oil container clean. If an oil cleaning device
is used, it is possible to remove the dirt that is
collected during storage. It is a surer means.
Replacing hydraulic oil while its temperature is
high
When the hydraulic oil is warm, it flows easily. In
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addition, sludge can also be drained from the cir-
cuit together with the oil. So, it is better to change
the hydraulic oil while it is warm. When changing
the hydraulic oil, the old oil must be drained as
much as possible. (Drain the oil not only from the
hydraulic tank, but also from the filter housing
and the drain plug hole in the circuit.) If the old oil
is left in the system, the contaminant and sludge
in the oil mix with the new oil and shorten the life
of the new hydraulic oil.
00 Index and foreword
Handling of hydraulic equipment
(Rev. 2012/10)
00-27
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