Komatsu PW160-7K Series, Operation And Maintenance Manual

Page: 255 / 358

MAINTENANCE SERVICE PROCEDURE
255
CLEAN INSIDE OF COOLING SYSTEM
WARNING
●
Immediately after the engine is stopped, the coolant is at
a high temperature and the radiator is under high internal
pressure.
If the cap is removed to drain the coolant in this condi-
tion, there is a hazard of burns. Wait for the temperature
to go down, then turn the cap slowly to release the pres-
sure before removing it.
●
Cleaning is carried out with the engine running. When
standing up or leaving the operator's seat, raise the
safety lock lever to the LOCK position.
●
For details of starting the engine, see "CHECK BEFORE
STARTING ENGINE (149)" and "STARTING ENGINE (162)"
in the OPERATION section.
●
There is danger of touching the fan if the undercover is
left removed.
Never enter behind the machine when the engine is run-
ning.
Clean the inside of the cooling system, change the coolant and
replace the corrosion resistor agent KI according to the table
below.
Stop the machine on level ground when cleaning or changing the
coolant.
Use a permanent type of antifreeze.
If, for some reason, it is impossible to use permanent type anti-
freeze, use an antifreeze containing ethylene glycol.
Super Coolant (AF-ACL) has an anti-corrosion effect as well as
an antifreeze effect.
The ratio of antifreeze to water depends on the ambient tempera-
ture, but to obtain the corrosion resistance effect, a minimum ratio
of 30% by volume is necessary.
In areas where the water is hard, add Komatsu genuine corrosion
resistor agent KI. One packet of corrosion resistor agent contains
100g. The standard density of the mixture should be 7 g/litres.
Kind of coolant
Cleaning inside of cooling system
and changing coolant
Adding corrosion resistor agent KI
Permanent type antifreeze
(All season type) Every year (autumn) or every
2000 hours whichever comes first
Every 1000 hours and when cleaning
the inside of the cooling system and
when changing coolant. Non permanent type antifreeze
containing ethylene glycol
(winter, one season type) Every 6 months (spring, autumn)
(Drain antifreeze in spring,
add antifreeze in autumn)
When not using antifreeze
Every 6 months or every 1000
hours whichever comes first