Komatsu Galeo HD405-7R, Operation & Maintenance Manual

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MAINTENANCE
SERVICE PROCEDURE
CLEAN INSIDE OF COOLING SYSTEM
WARNING
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, 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 shift lever to the N position and
set the parking brake switch to the PARKING position.
For details of starting the engine, see "OPERATIONS, CHECKS BEFORE STARTING (PAGE 3-87)" and "STARTING ENGINE
(PAGE 3-89)" in the OPERATION section of the Operation and Maintenance Manual.
When the undercover is removed, there is danger of touching the fan.
Never go to the front of the machine when the engine is running.
Stop the machine on level ground when cleaning or changing the coolant.
Clean the inside of the cooling system, change the coolant according to the table below.
Antifreeze coolant
Interval for cleaning inside of cooling system
and changing antifreeze coolant
Precautions for use
Komatsu supercoolant
(AF-NAC)
Every two years or every 4000 hours
whichever comes first
1*
*1: When using Komatsu Supercoolant (AF-NAC), there is no need to use a corrosion resistor.
When no corrosion resistor is used, use the special cover (600-411-9000). Please consult your Komatsu
distributor about the method of installing.
When using corrosion resistor, use Komatsu genuine corrosion resistor. If you use another corrosion resistor,
it may cause serious problems such as corrosion of the engine and parts of the cooling system that use light
metals such as aluminum.
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 antifreeze coolant is essential.
Komatsu machines are supplied with Komatsu Supercoolant (AF-NAC). Komatsu Supercoolant (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
As a basic rule, we do not recommend the use of any coolant other than Komatsu genuine supercoolant (AF-NAC).
If you use another coolant, it may cause serious problems such as corrosion of the engine and parts of the cooling
system that use light metals such as aluminum.
To maintain the anticorrosion properties of Supercoolant (AF-NAC), always keep the density of Supercoolant
between 30% and 68%.
When deciding the ratio of antifreeze to water, check the lowest temperature in the past, and decide from the mixing
table given below.
It is actually better to estimate and temperature about 10
°
C (18
°
F) lower when deciding the mixing ratio.
The mixing ratio depends on the ambient temperature, but it should always be a minimum of 30% by volume
(antifreeze/total amount of coolant x 100).
Even in areas where it is not necessary to prevent freezing, use Supercoolant (AF-NAC) at a mixing ratio of at least
30% to prevent corrosion of the cooling system.
The freezing temperature of undiluted antifreeze is -15
°
C (5
°
F). Do not store undiluted antifreeze at a temperature
of below -15
°
C (5
°
F).
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