Komatsu Bulldozers D155AX-6: General Maintenance

When opening inspection windows or the oil filler port of the tank to carry out inspection, be careful not to drop nuts, bolts, or tools inside the machine.

• If such things are dropped inside the machine, it may cause damage and/or malfunction of the machine, and will lead to failure. If you drop anything inside the machine, always remove it immediately.

• Do not put unnecessary things in your pockets. Carry only things which are necessary for inspection.

Inspect the air cleaner clogging monitor frequently to see if the air cleaner is clogged.

• Clean the air cleaner element at a shorter interval than specified.

When removing parts at locations where there are O-rings or gasket seals, clean the mounting surface, and replace with new parts.

• When doing this, be careful not to forget to assemble the O-rings and gaskets.

Checks after operation (with engine stopped)

• Checks after operation (with engine stopped)

• Have all inspection and maintenance items been performed correctly?

• Have any tools or parts been dropped inside the machine? It is particularly dangerous if parts are dropped inside the machine and get caught in the lever linkage mechanism.

• Are there any leakage of coolant or oil? Have all nuts and bolts been tightened?

Checks when operating engine

• For details of the checks when operating the engine, see “PROPER TOOLS (2-29)“ and pay careful attention to safety.

• Is there any leakage of fuel or oil when the engine speed is raised?

When the side cover is open, do not open or close the cab.

• Before opening or closing the cab, always close the engine side cover first.

• Except, however, when the hydraulic driving fan is in the reverse rotation mode.

Oil is used for the engine and hydraulic equipment under extremely severe conditions (high temperature, high- pressure), so the oil deteriorates with use.

• Always refer to the Operation and Maintenance Manual and use the recommended oil that matches the grade (class) and maximum and minimum ambient temperatures.

• Even if the oil does not appear to be dirty, always change it after the specified interval.

Oil corresponds to blood in the human body, always be careful when handling it to prevent any impurities (water, metal particles, dirt, etc.) from getting in.

• The majority of problems with the machine are caused by the entry of such impurities.

• Take particular care not to let any impurities get in when storing or adding oil.

Never mix oils of different grades or brands.

• Having too much oil or too little oil are both causes of problems.

When the machine is shipped from the factory,T010 (power train oil) is used for the hydraulic system.

• When using H046-HM hydraulic oil, drain all the oil and fill with the specified amount of oil.

• Always use oil recommended by Komatsu. If any other oil is used, it will cause clogging of the filter.

• There is no problem if the new oil is mixed with the small amount of oil remaining in the piping and cylinders.

Always use fuel that matches the temperatures given in the Operation and Maintenance Manual.

• If the fuel is used in temperatures lower than the specified temperature for use (particularly at temperatures of lower than -15°C), the properties of the fuel will make it congeal.

• If the fuel is used in temperatures higher than the specified temperature for use, the viscosity will go down, and this may result in a drop in output or other problems.

This machine is filled with Komatsu genuine super coolant (AF-NAC) at the factory. This super coolant has the important function of preventing corrosion in the cooling system as well as preventing freezing.

• As a general rule, we do not recommend use of any coolant other than the Komatsu super coolant (AF-NAC). If any other coolant is used, it may cause serious problems with the engine and cooling system.

The ratio of Supercoolant (AF-NAC) to water differs according to the ambient temperature.

• For details of the ratio when mixing, see “RECOMMENDED FUEL, COOLANT, AND LUBRICANT (4-12)“.

The nipples not included in the MAINTENANCE section are nipples used when overhauling, so they do not need grease.

• If any part becomes stiff or generates noise after being used for a long time, grease it.

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.

When keeping drum cans for a long period, put the drum on its side so that the filler port of the drums is at the side to prevent moisture from being sucked in.

• If drums have to be stored outside, cover them with a waterproof sheet or take other measures to protect them.

Filters are extremely important safety parts. They prevent impurities in the fuel and air circuits from entering important equipment and causing problems.

• Replace all filters periodically. For details, see the Operation and Maintenance Manual.

• However, when working in severe conditions, replace the filters at shorter intervals according to the oil and fuel (sulfur content) being used.

When installing electrical equipment, connect it to the special power source connector.

• Do not connect the optional power source to the fuse, starting switch, or battery relay.