. MAINTENANCE SERVICE PROCEDURE CLEAN INSIDE OF COOLING SYSTEM WARNING Komatsu genuine SUPERCOOLANT (AF-NAC) 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 SUPERCOOLANT (AF-NAC). SUPERCOOLANT (AF-NAC) has excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours. As a basic rule, we do not recommend the use of any coolant other than SUPERCOOLANT (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.
To maintain the anticorrosion properties of coolant, always keep the density of coolant between 30% and 64%. When selecting coolant, investigate the lowest temperature in the past and decide the density for the coolant from the coolant density table below. When actually deciding the density for the coolant, set it approximately 10 ° C (50 ° F) below lowest temperature. The density must be over 30% at least. If the density of obtained coolant is higher than the necessary density for lowest temperature, dilute it with adequate distilled water, and then fill it into the tank. If there is any unclear point, contact your Komatsu distributor.
Coolant density table 4 - 30 Immediate ly after the engine i s stopped , the coolant is at h igh temperature and the inside o f the radiator is under high-pressure. If th e cap is removed under th ese condition s, boiling wat er will spur t out and cause burn s. Always wait for the temperature to go down, then turn t he cap sl owly to r elea se the internal pressure before removing the c ap. To preven t the mach ine from moving while the radiator i s bein g flushed, set the parking brak e to the P ARK position and the gea r shift lever to th e N position.
I f the machine moves, i t may lead to seriou s personal i njury Stop t he m achine on level gr oun d when cleaning or changing the coolant. Clean the i nside of t he coolin g system, c hange the c oolant according t o the t able below. Coolant Interval for cleaning inside of cooling system and changing antifreeze coolant Komatsu genuine SUPERCOOLANT (AF-NAC) Every 2 years or every 4000 hours whichever comes sooner Minimum Temp °C Above -10 -15 -20 -25 -30 -35 -40 -45 -50 °F Above 14 5 -4 -13 -22 -31 -40 -49 -58 Density (%) 30 36 41 46 50 54 58 61 64