Komatsu PW98MR-10 Operation & Maintenance Manual page 309

MAINTENANCE
• 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.
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. 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. Also, using fuel with high sulfur content
may deteriorate the engine parts, inducing failures, decrease of the life and degradation in performance.
The ASTM diesel fuel recommended by Komatsu may contain 5 % or less of biofuel. The EN diesel fuel
may contain 7 % or less of it. Use the fuel which is filled into the storage tank or the fuel tank of the
machine as soon as possible.
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 anticorrosion, 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 "COOLANT AND WATER FOR DILUTION (4-5)".
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 it with city water.
• If the engine overheats, wait for the engine to cool 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.
GREASE
• Grease is used to prevent seizure and noises at the joints.
• This construction equipment is used under heavy-duty conditions. Komatsu recommends using the recom-
mended grease and follow the replacement intervals and recommended ambient temperatures given in this
Operation and Maintenance Manual.
• Grease fittings not included in the periodic maintenance section are the grease fittings for overhaul, so they
do not need grease.
If any part becomes stiff after being used for long time, add grease.
• Always wipe off all of the old grease that is pushed out when greasing.
Be particularly careful to wipe off the old grease in places where sand or dirt sticking in the grease would
cause wear of the rotating parts.
PERFORM KOWA (Komatsu Oil Wear Analysis)
KOWA is a maintenance service that makes it possible to prevent machine failures and downtime. With KOWA,
the oil is periodically sampled and analyzed. This enables early detection of wear of the machine drive parts and
other problems.
WENAM00061
OUTLINE OF MAINTENANCE
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