Komatsu PC400LC-5 Operation & Maintenance Manual page 175

24. SERVICE PROCEDURE
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Prepare a container to catch drained coolant: Min 34 P (9.0 US
gal, 7.5 UK gal) capacity.
If a corrosion resistor cartridge is installed, close valves 0.
Turn radiator cap @ slowly to remove it.
Remove the undercover, then set a container to catch the coolant
under drain valve @ and drain plug 0. Open drain valve @ at
the bottom of the radiator to drain the water. Remove drain plug
@ in the cylinder block when draining the water.
After draining the water, close drain valve @ and drain plug 0,
and fill with city water.
Open drain valve @ and drain plug 0, run the engine at low
idling, and flush water through the system for IO minutes.
When doing this, adjust the speed of filling and draining the
water so that the radiator is always full.
While flushing water through the system, watch carefully that
the water inlet hose does not come out of the radiator water
filler.
After flushing, stop the engine, open drain valve @ and drain
plug 0, then close it again after all the water has drained out.
A&
AE0984-80
After draining the water, clean with a flushing agent.
We recommend use of a Komatsu genuine cleaning agent. For
details of the cleaning method, see the instructions given with
the cleaning agent.
After cleaning, open drain valve @ and drain plug @to drain all
the cooling water, then close them and fill slowly with clean
water.
When the water comes up to near the water filler port, open
drain valve @ and drain plug 0, run the engine at low idling, and
continue to run water through the system until clean colorless
water comes out.
When doing this, adjust the speed of filling and draining the water
so that the radiator is always full.
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