Komatsu HM400-5, Operation & Maintenance Manual

Page: 328 / 446

NOTICE
Komatsu recommends using Komatsu genuine engine oil for KDPF. If engine oil other than Komatsu
genuine oil for KDPF is used, it may shorten cleaning interval of KDPF filters, adversely affect the en-
gine such as deteriorated oil may reduce lubricating function, and it may cause failure, shortening of
the machine life, lowering of performance and increase of fuel consumption.
FUEL
• To prevent the moisture in the air from condensing and forming water inside the fuel tank, always fill the fuel
tank with fuel after completing the day's work.
• The fuel pump is a precision equipment, and if fuel containing water or dirt is used, it cannot work properly.
• Be extremely careful not to let impurities get in when storing or adding fuel.
• Always use the fuel specified for the temperature that is described in Operation and Maintenance Manual.
• If the fuel is used at the temperatures lower than the specified temperature (particularly at tempera-
tures below -15 °C), the fuel will solidify.
• If the fuel is used at temperatures higher than the specified temperature, the viscosity will drop, and it
may result in troubles such as a drop of output.
• Before starting the engine, or after 10 minutes of adding fuel, drain the sediment and water from the fuel
tank.
• If the engine runs out of fuel, or if the filters are replaced, it is necessary to bleed the air from the circuit.
• If there is any foreign material in the fuel tank, wash the tank and fuel system.
NOTICE
The fuel used must be ultra low-sulfur diesel fuel. (≤10 ppm)
To ensure good fuel consumption characteristics and exhaust gas characteristics, the engine mounted
on this machine uses an electronically controlled high-pressure fuel injection device and emission gas
control system (KDPF). Since the high-pressure fuel injection device requires high precision parts and
lubrication, if low viscosity fuel with low lubricating ability is used, its durability may drop considerably.
And using fuel with high sulfur content can deteriorate the engine parts and KDPF catalyzer, inducing
failures, decrease of the life and degradation in performance.
COOLANT AND WATER FOR DILUTION
• 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.
• When using antifreeze, always observe the precautions given in Operation and Maintenance Manual.
• Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water, so it is not flammable.
• The coolant density needs to be changed according to the ambient temperature.
For details of the coolant density, see “METHOD FOR CLEANING INSIDE OF COOLING SYSTEM
(4-19)”.
Even in areas where it is not considered necessary to prevent freezing, always use Non-Amine Engine
Coolant (AF-NAC) with a density of over 30 % in order to prevent corrosion of the cooling system.
Non-Amine Engine Coolant (AF-NAC) is diluted with distilled water that does not contain any ions or water-
hardening substances. Never dilute the Non-Amine Engine Coolant (AF-NAC) with ordinary water.
• If the engine overheats, wait for the engine to cool down before adding coolant.
• If the coolant level is low, it will cause overheating, and will also cause problems with corrosion due to air
entering the coolant.
OUTLINE OF MAINTENANCE MAINTENANCE
4-6