FOREWORD
HANDLING ELECTRIC EQUIPMENT AND HYDRAULIC COMPONENTS
00-10
WA470-6, WA480-6
12
HANDLING ELECTRIC EQUIPMENT AND HYDRAULIC
COMPONENTS
00
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 gives sections on “Handling electric equipment” and “Handling hydraulic equipment” (particularly gear oil and hydraulic
oil).
Points to remember when handling electric equipment
1.
Handling wiring harnesses and connectors.
Wiring harnesses consist of wiring connecting one component to
another component, connectors used for connecting and disconnect-
ing one wire from another wire, and protectors or tubes used for pro-
tecting 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.
2.
Main failures occurring in wiring harness
A. 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 connec-
tor, 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.
B. 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 breakage.
