Komatsu PC130-7, Руководство по ремонту, Страница: 95 / 342

PC130-7
20-205
TROUBLESHOOTING POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCE
(1)
3) Disconnections in wiring
If the wiring is held and the connectors are
pulled apart, or components are lifted with a
crane with the wiring still connected, or a
heavy object hits the wiring, the crimping of
the connector may separate, or the solder-
ing may be damaged, or the wiring may be
broken.
4) High-pressure water entering connector
The connector is designed to make it diffi-
cult for water to enter (drip-proof structure),
but if high-pressure water is sprayed directly
on the connector, water may enter the con-
nector, depending on the direction of the
water jet.
As already said, the connector is designed
to prevent water from entering, but at the
same time, if water does enter, it is difficult
for it to be drained. Therefore, if water
should get into the connector, the pins will
be short-circuited by the water, so if any
water gets in, immediately dry the connector
or take other appropriate action before
passing electricity through it.
5) Oil or dirt stuck to connector
If oil or grease are stuck to the connector
and an oil film is formed on the mating sur-
face between the male and female pins, the
oil will not let the electricity pass, so there
will be defective contact.
If there is oil or grease stuck to the connec-
tor, wipe it off with a dry cloth or blow it dry
with compressed air and spray it with a con-
tact restorer.
a
When wiping the mating portion of the
connector, be careful not to use exces-
sive force or deform the pins.
a
If there is oil or water in the compressed
air, the contacts will become even dirtier,
so remove the oil and water from the
compressed air completely before
cleaning with compressed air.