Clean Inside Of Cooling System - Komatsu WA320-5H Operation & Maintenance Manual

MAINTENANCE

CLEAN INSIDE OF COOLING SYSTEM

q Immediately after the engine is stopped, the engine coolant is hot and the pressure inside the radiator
is high. Removing the cap and draining the water under this condition could cause burns. Allow the
engine to cool down. To loosen and remove the radiator cap, use a suitable climbing aid (for example
a ladder) to climb up the back of the machine. Then turn the cap slowly to release the pressure.
q Start the engine and flush the system. When standing up or leaving the operator's seat, set the safety
lock lever to the LOCK position.
q For details of starting the engine, see "CHECK BEFORE STARTING ENGINE, ADJUST (3-54)" and
"STARTING ENGINE (3-70)" in the OPERATION section of the Operation and Maintenance Manual.
q When the undercover is removed, there is danger of touching the fan.
Never go to the rear of the machine when the engine is running.
Clean the inside of the cooling system, change the coolant and replace the corrosion resistor according to the
table below.
Kind of coolant
Permanent type antifreeze
(All season type)
Non-permanent type
antifreeze containing
ethylene glycol (winter,
one season type)
When not using antifreeze
Stop the machine on level ground when cleaning the inside of cooling system or changing the coolant.
Use a permanent type of antifreeze.
If, for some reason, it is impossible to use permanent type antifreeze, 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 temperature, but to obtain the corrosion resistance effect,
a minimum ratio of 30% by volume is necessary.
In areas where the water is hard, always add Komatsu genuine corrosion resistor agent KI. One packet of corro-
sion resistor (No. 600-411-1120) agent contains 100g (0.22 lb). The standard density of the mixture should be 7g/
liter (0.065 oz/US gal).
Cleaning inside of
cooling system and
changing coolant
Every year (autumn) or
every 2000 hours
whichever comes first
Every 6 months (spring
and autumn)
(Drain antifreeze in spring,
add antifreeze in autumn)
Every 6 months or every
1000 hours whichever
comes first
WARNING
Adding corrosion
resistor agent KI
(No. 600-411-1120)
Every 1000 hours and
when cleaning the inside
of the cooling system and
when changing coolant.
SERVICE PROCEDURE
4
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