. 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 o r stand when removing o r fitting the radiator c ap and when adding water. Immediately a fter 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 draini ng the water under this c ondition c ould cause burns.
Allow the engine to coo l down, then turn the cap slowly to release the pressure. Start the engin e and flush the system. B efore stan ding up or leavin g the o perator's seat, set the work equipment lock lever to the LOCK posi tion. For details of s tarting the engine, see "C HECK BE FORE STARTING ENGINE, ADJUST (PAGE 3-100)" a nd "STARTING E NGINE (PAGE 3-118)" in the OPERATION sectio n of the O peration an d Maintenance Manual. When the unde rcover is removed, there is danger of touching the f an. Never enter th e rear of the machine whe n the engi ne is runni Clean the inside 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