. MAINTENANCE SERVICE PROCEDURE CLEAN INSIDE OF COOLING SYSTEM WARNING *: Permanent type antifreeze shall meet the requirements of ASTM D3306-03. Stop the machine on level ground when cleaning or changing the coolant. 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 antifreeze coolant is essential. Komatsu machines are supplied with Komatsu Supercoolant (AF-NAC). Komatsu Supercoolant (AF-NAC) has excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours. Komatsu Supercoolant (AF-NAC) is strongly recommended wherever available.
To maintain the anticorrosion properties of Supercoolant (AF-NAC), always keep the density of Supercoolant between 30% and 68%. When using Komatsu Supercoolant (AF-NAC), there is no need to use a corrosion resistor. When no corrosion resistor is used, use the special cover (600-411-9000).Please consult your Komatsu distributor about the method of installing. When deciding the proportions for mixing the coolant with water, investigate the lowest temperature in the past and use the table below to decide the mixing ratio. Actually, set a temperature that is 10 ° C (50 ° F) lower than the minimum temperature.
The mixing ratio differs according to the ambient temperature, but a minimum of 30% by volume is needed (amount of antifreeze/total amount of water in cooling system x 100). The freezing temperature of 100% undiluted super coolant is -15 ° C (5 ° F). Be careful not to store the undiluted super coolant at temperatures below -15 ° C (5 ° F). 4 - 21 Use a ladder or stand whe n removing or fitting the radiator c ap and when adding water. Immediately after the engine i s stopped , the engin e coolant i s hot a nd the pressure inside th e radiato r is high. Removing the cap and drain ing the water under this c ondition co uld cause burns.
Allow the engine to coo l down, then turn the cap slowly to release the pressure. Start the engi ne and flush t he system. B efore stan ding up or leavin g the o perator's seat, set t he work equipment lock lever to the LOCK po sition. For details of starting the engine, see " CHECK BE FORE STARTING ENGINE, ADJUST (PAGE 3-99)" a nd "STARTING E NGINE (PAGE 3-117) " in the OPERATION sectio n of the O peration an d Maintenance Manual. When the und ercover is removed, there is danger of touching the fa n. Never enter t he rear of the machine whe n the engi ne is runni Clean the insid e of the cooling system, change t he coolan t and replace the corrosion r esistor according to th e table below.
Antifreeze coolant Interval for cleaning inside of cooling system and changing antifreeze coolant Replacing corrosion resistor Komatsu supercoolant (AF-NAC) Every two years or every 4000 hours whichever comes first unnecessary Permanent type antifreeze (All-season type, *) Every year (autumn) or every 2000 hours whichever comes first Every 1000 hours and when cleaning the inside of the cooling system and when changing coolant