FOREWORD
HANDLING ELECTRIC AND HYDRAULIC EQUIPMENT
WA500-6
00-13
HANDLING ELECTRIC AND HYDRAULIC EQUIPMENT
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To maintain the performance of the machine over a long period and to prevent failures or other problems 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 includes
sections on handling electric equipment and handling hydraulic equipment (particularly gear oil and hydraulic oil).
Handling Electric Equipment
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Handling Wiring Harnesses and Connectors
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Wiring harnesses consist of wiring connecting one component to
another component, connectors used for connecting and disconnecting
one wire from another wire, and protectors or tubes used for protecting
the wiring.
Compared with other electrical components fitted 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 wiring harnesses.
Main Failures Occurring in Wiring Harness
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1.
Defective contact of connectors (defective contact between male
and female)
Problems with defective contact are likely to occur because the
male connector is not properly inserted into the female connector,
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.
2.
Defective crimping or soldering of connectors
The pins of the male and female connectors are in contact at the
crimped terminal or soldered portion. If there is excessive force
brought to bear on the wiring, the plating at the joint will peel and
cause improper connection or breakage.
