SEN00056-01 00 Index and foreword Handling electric equipment and hydraulic component 1 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, con- nectors 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, 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 1) Defective contact of connectors (defec- tive contact between male and female) Problems with defective contact are likely to occur because the male connector is not properly inserted into the female con- nector, or because one or both of the con- nectors is deformed or the position is not correctly aligned, or because there is cor- rosion or oxidization of the contact sur- faces.
2) Defective crimping or soldering of connec- tors The pins of the male and female connec- tors are in contact at the crimped terminal or soldered portion, but if there is exces- sive force brought to bear on the wiring, the plating at the joint will peel and cause improper connection or breakage. 10 D65EX, PX, WX-15E0