. MAINTENANCE MAINTENANCE 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%. 4 - 21 Immediatel y after th e engine i s stopped, th e coolant is at a high temperature and th e radiator is under high i nternal pressure. If th e cap is removed to drain th e coolant in t his condition, t here i s a hazard of b urns. Wait for t he t emperature to g o down , then turn the ca p slowly t o release t he pressure before removin g it. Cleaning is carried o ut with th e engine run ning. When standing up or leaving the o perator's sea t, set the safety lock lever to the LOCK position.
For details of starting the engin e, see"BEFO RE STARTING ENGINE (PAGE 3-58)" an d "STARTING ENGINE (PAGE 3-74)" in the OPERATIO N section. The engine is operate d when w ashing, so it is dangerous if the machine move s whe n you are standing behind it. Never stand behind the machine when the engine is run Clean the in side of th e cooling system, c hange the coolant according to the table below. Antifreeze coolant Interval of cleaning inside of cooling system and changing antifreeze coolant Komatsu supercoolant (AF-NAC) Every two years or every 4000 hours whichever comes first Permanent type antifreeze (All-season type, *) Every year (autumn) or every 2000 hours whichever comes first.