Komatsu HM400-5, Operation & Maintenance Manual

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11. Push the head of dust indicator (8) to return the red line to
its original position.
METHOD FOR CLEANING INSIDE OF COOLING SYSTEM
k k
WARNING
• Immediately after the engine is stopped, the coolant is still hot and the pressure is accumulated in
the radiator.
If the radiator cap is removed in this condition and the coolant is drained, it may cause burns.
Always wait for the temperature to go down, turn the cap slowly to release the pressure.
• Start the engine and clean the inside of the cooling system.
When standing up or leaving the operator's seat, set the gear shift lever to NEUTRAL position (N)
and set the parking brake switch to “PARKING” position.
• For details of starting the engine, see OPERATION, “METHOD FOR OPERATIONS AND CHECKS BE-
FORE STARTING ENGINE (3-174)” and “METHOD FOR STARTING ENGINE (3-177)”.
• When the undercover is removed, there is a danger of touching the fan.
Never enter in 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, change the coolant according to the table below.
Coolant
Interval for cleaning inside of cooling sys-
tem and changing coolant
Non-Amine Engine Coolant (AF-NAC)
Every 2 years or 4000 hours, whichever
comes sooner
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.
MAINTENANCE MAINTENANCE PROCEDURE
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