Komatsu WA320-5H Service Manual

MAINTENANCE SERVICE PROCEDURE
4-23
CLEAN INSIDE OF COOLING SYSTEM 4
WARNING
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.
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).
Kind of coolant
Cleaning inside of
cooling system and
changing coolant
Adding corrosion
resistor agent KI
(No. 600-411-1120)
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
and autumn)
(Drain antifreeze in spring,
add antifreeze in autumn)
When not using antifreeze
Every 6 months or every
1000 hours whichever
comes first

Komatsu WA320-5H Specifications

General

Brand	Komatsu
Model	WA320-5H
Category	Compact Loader
Language	English