Handling Of Hydraulic Equipment - Komatsu PC200-8M0 Shop Manual

200 Foreword and general information

Handling of hydraulic equipment

Handling of hydraulic equipment

q With the increase in pressure and precision of
the hydraulic components, the most common
cause of a failure is dirt (foreign material) in the
hydraulic circuit. Therefore, the special care
must be taken when adding hydraulic oil,or
wh en di s as s em bl in g or a s se mb li ng th e
hydraulic components.
Be careful of working environment
q Avoid adding hydraulic oil, replacing filters, or
repairing 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
q
the hydraulic is performed in the field, there is
danger of dust entering the components. It is
also difficult to check the performance of the
components after repairs, so it is desirable to
use the component exchange service. The dis-
assembly and assembly of the hydraulic com-
ponents must be performed in the specially
arranged dustproof workshop and the perfor-
mance test of the components must be per-
formed with the special testing equipment.
Sealing openings
Plug the pipes and the openings of the compo-
q
nents which are removed with the caps, tapes,
vinyl bags, etc. to prevent foreign material from
entering. 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 cus-
tomer for disposal, or dispose it by yourself.
PC200, 200LC, 220, 220LC-8M0
Preventing intrusion of foreign materials during
refilling operations.
q Care must be taken when adding hydraulic oil
so that foreign material does not enter. Keep
the oil filler port and the area around it, oil sup-
ply 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
q When the hydraulic oil is warm, it flows easily.
In addition, sludge can also be drained from
the circuit 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.
SEN06112-00
1
15
00-200