5 Maintenance 5.7.11. Maintenance every 2000 operating hours All maintenance operations to be performed after 10, 50, 100, 250, 500 and 1000 hours of operation also fall into this mainte nance category. Cooling system – exchanging coolant and cleaning the system Danger of being burnt! The coolant is under pressure if the engine is hot. Hot coolant may squirt out during opening. Check the coolant level only after the engine has sufficiently cooled down. Open the cover of the radiator (arrow) by turning it slowly so that the pressure can escape. Danger of fire! Antifreeze may ignite at the hot engine! Wait until the engine has cooled down, before refilling antifreeze.
NOTE The coolant must be exchanged after max. two years. While preparing the coolant, make sure to adhere to the prescribed mixing proportions to ensure a freezing protection up to -37°C! This is also valid for countries with moderate climate. The coolant has to consist of 50 vol.% coolant additive and 50 vol.% water. Only monoethylene glycol and dieethylene glycol are permitted as coolant additives which are both contained in commercially available standard coolants. If the water contains too much lime, the cooling system may be impaired. In this case, use a mixture of potable water and distilled or deionized water.
In areas where the water is hard, always add KOMATSU genuine corrosion resistor agent KI. One packet of corrosion resistor (No. 600-411-1120) agent contains 100g (0.22 lb). The standard den sity of the mixture should be 7g/liter (0.065 oz/US gal). 5-66 WA90-5 – VEAM270100 WARNING WARNING DANGER DANGER