Komatsu PC400LC-5 Operation & Maintenance Manual page 173

24. SERVICE PROCEDURE
24.2.2 CLEAN INSIDE OF COOLING SYSTEM
g
WARNING
Soon after the engine has been stopped, the coolant is hot
and can cause personal injury. Allow the engine to cool
before draining water.
Since cleaning is performed while the engine is running, it is
very dangerous to enter the rear side of the machine as the
machine may suddenly start moving. If the under cover is left
removed, it may interfere with the fan. While the engine is
running, never enter the rear side of the machine.
Never remove the radiator cap when the engine is at operat-
ing temperature. At operating temperature, the coolant is
under pressure. Steam blowing up from the radiator could
cause personal injury. Allow the engine to cool until the
radiator filler cap is cool enough to touch with your hand.
Remove the filler cap slowly to allow pressure to be relieved.
l Clean the inside of the cooling system change the coolant and
replace the corrosion resistor according to the table below.
Kind of coolant
Cleaning inside of
cooling system and
changing coolant
Replacing corrosion
resistor
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)
When not using antifreeze
Every 6 months (spring,
autumn)
(Drain antifreeze in spring,
add antifreeze in autumn)
Every 6 months or every
1000 hours whichever
comes first
Every 1000 hours and
when cleaning the in-
side of the cooling
system and when
changing coolant.
l Stop the machine on level ground when cleaning or changing
the coolant.
0 Use a permanent type of antifreeze.
If, for some reason, it is impossible to use permanent type
antifreeze, use an antifreeze containing ethylene glycol.
3-29