Komatsu WA150PZ-5 Wheel Loader Repair Manual

Manuals: Shop Manual
01 GENERAL ………………………………………………………………………………………………….01-1
10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD……………………….10-1
20 TESTING AND ADJUSTING ……………………………………………………………………….20-1
30 DISASSEMBLY AND ASSEMBLY ………………………………………………………………..30-1
90 OTHERS ……………………………………………………………………………………………………90-1
Manual Extract :

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 hydraulic oil)

1. PRECAUTIONS 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 disconnecting one wire from another wire, and protector 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
(1) Faulty contact of connectors
(faulty contact between male and female).

Problems with faulty contact are likely to occur because the male connector is not properly 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 oxidation of the contact surfaces.

(2) Defective compression or soldering of connectors The pins of the male and female connectors are in contact at the compressed terminal or soldered portion, but there is excessive force on the wiring, and the plating peels to cause improper connection or breakage.