. MAINTENANCE OUTLINE OF SERVICE 4 - 5 COOLANT AND WATER FOR DILU TION n of preventing corrosion as well as preventing freezing. ot an issue, the use of antifreeze coolant is essential. The coolant has the important functio n of preventing corrosion as well as preventing freezing Even in the areas where freezing is n ot an issue, the use of antifreeze coolant is essential. Komatsu machines are supplied with Komatsu Supercoolant (AF-NAC). Komatsu S upercoolant (A F-NAC ) has excellent anticorrosion, antifreeze and cooling propertiesand can be used continuousl y for 2 years or 4000 h ours. Komatsu Supercoolant (AF-NAC) is s trongly recommended wherever availabl e. r).
e amounts of minerals (calcium, When diluting the antifreeze coolant, use distilled water or tap water (soft wate Natural water, such as a river water or well water (hard water), contains larg e amounts minera magnesium, etc.), and this makes it ea sier for scale to form inside the engine or radiat or. Once scale is deposited inside the engine or radiator, it is ex tremely difficult to remove. It also caus es overheating due t o poor heat exchange, so when you dilute the coo lant, we recommend that you use water an overal l hardness o f less than 100 PPM. When using antifreeze, always obser ve the precautions given in the Operation and Maintenance M anual.
Antifreeze coolant is flammable, so b The ratio of Supercoolant (AF-NAC) t o water differs according to the ambient temperature. For details of the ratio when mixing, s ee "CLEAN INSIDE OF COOLING SYSTEM ( PAGE Supercoolant (AF-NAC) may be supp lied in premix. In this case, never add dil uting If the engine overheats, wait for the e If the coolant level is low, it will cause o verheating, and will also cause problems with c orrosion due to air entering the coolant. GREASE d noises at the joints. under heavy-duty conditions.
Always use the recommended grease and Grease is used to prevent seizure an This construction equipment is used recommended greas follow the change intervals and recom mended ambient temperatures given in this O peration and M aintenance Manual. The nipples not included in the MAINT ENANCE section are nipples used when overhauling , so they do not need grease. noise after being used for a long time, grease it. hat is pushed out when greasing.
If any part becomes stiff or generates noise after being used for a long time, g rease Always wipe off all of the old grease t Be particularly careful to wipe off the o ld grease in places where sand or dirt st icking in the grease would c ause wear of the rotating parts.