Komatsu 960E-1 -, Руководство по ремонту, Страница: 50 / 51

CEN00002-05 00 Index and foreword
32
Handling electrical equipment and
hydraulic components
To maintain the performance of the machine over a long period, and to prevent failures or other troubles before
they occur, correct “operation“, “maintenance and inspection“, “troubleshooting“, and “repairs” must be carried
out. This section deals particularly with correct repair procedures for mechatronics and is aimed at improving the
quality of repairs. For this purpose, it provides information on handling electrical equipment and handling hydrau-
lic equipment (particularly gear oil and hydraulic oil).
Points to remember when handling electrical equipment
1. Handling wiring harnesses and connectors
Wiring harnesses consist of wiring connecting
one component to another component, connec-
tors used for connecting and disconnecting one
wire from another wire, and protectors or tubes
used for protecting the wiring.
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, dur-
ing 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 wiring harnesses.
2. Main failures occurring in wiring harness
• Defective contact of connectors (defective
contact between male and female)
Problems with defective contact are likely to
occur because the male connector is not prop-
erly inserted into the female connector, or
because one or both of the connectors is
deformed or the position is not correctly aligned,
or because there is corrosion or oxidization of
the contact surfaces. The corroded or oxidized
contact surfaces may become shiny again (and
contact may become normal) by connecting and
disconnecting the connector about 10 times.
• Defective crimping or soldering of connectors
The pins of the male and female connectors are
in contact at the crimped terminal or soldered
portion, but if there is excessive force brought to
bear on the wiring, the plating at the joint will
peel and cause improper connection or break-
age.