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

SEN06112-00

Handling of electrical equipment

q To maintain the performance of the machine over a long period, and to prevent failures or troubles
before they occur, correct "operation", "maintenance and inspection" "troubleshooting", and "repairs"
must be performed. This section deals particularly with correct repair procedures for mechatronics com-
ponents and is aimed at improving the quality of repairs. For this purpose, it describes the working pro-
cedures in "Handling of electrical equipment".
Precautions for handling electric equipment
Handling wiring harnesses and connectors
q Wiring harnesses consist of wires connecting
one component to another component, con-
nectors used for connecting and disconnecting
one wire from another wire, and protectors or
tubes used for protecting the wires.
q Compared with other electrical components fit-
ted in boxes or cases, wiring harnesses are
more likely to be affected by the direct effects
of rain water, heat, or vibration. Furthermore,
during inspection and repair operations, they
are frequently removed and installed again, so
they are likely to suffer deformation or damage.
For this reason, it is necessary to be extremely
careful when handling the wiring harnesses.
Main failures occurring in wiring harness
Defective contact of connectors (defective con-
tact between male and female connectors)
q Problems with defective contact are likely to
occur because the male connector is not prop-
erly inserted into the female connector,or
bec aus e on e or bo th of con necto rs ar e
deformed or the position is not correctly
aligned, or because there is corrosion or oxi-
dization of the contact surfaces. The corroded
or oxidized contact surfaces may become
shiny again (and contact may become normal)
by connecting and disconnecting the connec-
tors approximately ten times.
20
00-200
200 Foreword and general information

Handling of electrical equipment

Defective crimping or soldering of connectors
q The pins of the male and female connectors
are attached to wires by crimping or soldering.
If excessive force is applied to the wire, the
joining area may become loose, which may
result in a defective connection or breakage.
Disconnections in wiring
q If the wiring harness is pulled to disconnect the
connector, or the components are lifted with a
crane while the wiring harness is still con-
nected, or a heavy object hits the wiring har-
ness, the crimping of the connector may
separate, or the soldering may be damaged, or
the wiring harness may be broken.
PC200, 200LC, 220, 220LC-8M0
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