Komatsu PC1250-11, Original Instructions Manual

Page: 321 / 452

• 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 cooling system made of light metal such as
aluminum.
• 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 in accordance with the ambient temperature.
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.
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.
MAINTENANCE OUTLINE OF MAINTENANCE
4-5