MAINTENANCE MAINTENANCE PROCEDURE
4-25
CLEAN INSIDE OF COOLING SYSTEM 4
WARNING
q 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 condition, there is a hazard of
burns. Wait for the temperature to go down, then turn the cap slowly to release the pressure before
removing it.
q Cleaning is carried out with the engine running. 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“BEFORE STARTING ENGINE (3-56)“ and “STARTING ENGINE (3-
72)“ in the OPERATION section.
q There is danger of touching the fan if the undercover is left removed.
Never enter behind 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 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.
When deciding the ratio of antifreeze to water, check the lowest temperature in the past, and decide from the mix-
ing rate table given below.
It is actually better to estimate a temperature about 10°C lower when deciding the mixing rate.
Mixing rate of water and antifreeze
Kind of coolant
Cleaning inside of cooling system
and changing coolant
Permanent type antifreeze
(All season type)
Every year (autumn) or every 2000 hours
whichever comes first
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
Min. atmospheric
temperature
°C Above -10 -15 -20 -25 -30
Amount of antifreeze liters 4.0 4.8 5.5 6.2 6.7
Amount of water liters 9.4 8.6 7.9 7.2 6.7
Volume ratio (%) 3036414650
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