Method For Cleaning Inside Of Cooling System - Komatsu HB365LC-3 Operation & Maintenance Manual

MAINTENANCE
5)
Always install the cover (3) so that the vacuator valve
(4) faces right below (A).
6)
When the cover (3) is installed, check that the clear-
ance between the air cleaner body and cover (3) is not
too large.
If the clearance is too large, remove the cover (3), and
then install it again.
CHECK AND REPLACE VACUATOR VALVE
Check vacuator valve (4) for damage and deformation of its rubber portion.
If the vacuator is damaged or its rubber part is deformed, replace it with a new one.

METHOD FOR CLEANING INSIDE OF COOLING SYSTEM

• Immediately after the engine is stopped, the coolant is still hot and the pressure is accumulated in
the radiator. If the cap is removed under this condition and the coolant is drained, it may cause a
burn. Wait for the temperature to go down, and then turn the cap slowly to release the pressure.
• When starting the engine while cleaning the machine, set the lock lever in LOCK position to prevent
the machine from moving.
• If the undercover has been removed, there is a danger of touching the fan.
Never enter the rear part of the machine when the engine is running.
Place the machine on a level ground when cleaning or changing the coolant.
Clean the inside of the cooling system, or change the coolant according to the table below.
Coolant
Non-Amine Engine Coolant
(AF-NAC)
The coolant has the important function of preventing corrosion as well as preventing freezing.
Even in the areas where freezing is not an issue, the use of coolant is essential.
Komatsu machines are supplied with Non-Amine Engine Coolant (AF-NAC). Non-Amine Engine Coolant (AF-
NAC) has excellent anti-corrosion, antifreeze and cooling properties and can be used continuously for 2 years
or 4000 hours.
Komatsu recommends the use of Non-Amine Engine Coolant (AF-NAC). If you use another coolant, it may
cause serious problems, such as corrosion of the engine and aluminum parts of the cooling system.
To maintain the anti corrosion properties of Non-Amine Engine Coolant (AF-NAC), always keep the density of
Non-Amine Engine Coolant between 30% and 64%.
Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water. When using the coolant, investigate
the lowest temperature in the past and decide the density for the coolant from the coolant density table below.
When deciding the density for the coolant, set it for a temperature 10 °C below the actual lowest temperature in
the working area.
The coolant density varies according to the ambient temperature, but it must be over 30% at least.
Coolant density table
Min. atmospheric tem-
perature
k k
Cleaning of inside of cooling system and re-
placement of coolant
4000 hours, whichever comes sooner
-10 or
°C -15
more
WARNING
Every 2 years or
-20 -25 -30
MAINTENANCE PROCEDURE
-35 -40 -45 -50
4-21