4.9 Service procedure
Maintenance When required
WA470-6H – VEAM946100 4-35
Clean inside of cooling system
WARNING
! Use a ladder or stand when removing or fitting the radiator
cap and when adding water.
! 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.
! 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.
! For details of starting the engine, see "Check before starting
engine, adjust (3-88)" and "Starting engine (3-105)" in the
OPERATION section of the Operation and Maintenance
Manual.
! When the undercover is removed, there is danger of touch-
ing the fan.
Never go to the rear of the machine when the engine is run-
ning.
Clean the inside of the cooling system, change the coolant and
replace the corrosion resistor according to the table below.
Permanent type antifreeze shall meet the requirements of ASTM
D3306-03.
Stop the machine on level ground when cleaning or changing
the coolant.
The coolant has the important function of preventing corrosion
as well as preventing freezing.
Kind of coolant
Cleaning inside of cooling
system and changing coolant
Adding corrosion
resistor
KOMATSU supercoolant
(AF-NAC)
Every two years or every 4000
hourswhichever comes first
unnecessary
Permanent type antifreeze
(All-season type)
Every year (autumn) or every 2000
hours whichever comes first.
Every 1000 hoursand when clean-
ing the inside of the cooling system
and when changing coolant.
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