MAINTENANCE MAINTENANCE PROCEDURE Cooling System Coolant - Clean/Change 0. Immediately after the engine is stopped, the coolant is at a high temperature and the radiator is under high internal pressure. If the cap is removed to drain the coolant in this condition, there is a hazard of burns. Wait for the temperature to go down, then turn the cap slowly to release the pressure before removing it. Cleaning is carried out with the engine running. When standing up or leaving the operator's seat, set the safety lock lever to the LOCK position. For details of starting the engine, see"BEFORE STARTING ENGINE ( 3-31 )" and "STARTING ENGINE ( 3-43 )" in the OPERATION section.
The engine is operated when washing, so it is dangerous if the machine moves when you are stand- ing behind it. Never stand behind the machine when the engine is running. the table below. Stop the machine on level ground when cleaning or changing the coolant. Use a permanent type of antifreeze. If, for some reason, it is impossible to use permanent type antifreeze, use an antifreeze containing ethylene glycol. Super Coolant (AF-ACL) has an anti-corrosion effect as well as an antifreeze effect. The ratio of antifreeze to water depends on the ambient temperature, but to obtain the corrosion resistance effect, a minimum ratio of 30% by volume is necessary.
In areas where the water is hard, always add Komatsu genuine corrosion resistor agent KI. One packet of corro- sion resistor agent contains 100 g (0.22 lb). The standard density of the mixture should be 7 g/liter (0.065 oz./US gal). When deciding the ratio of antifreeze to water, check the lowest temperature in the past, and decide from the mix- ing rate table given below. It is actually better to estimate a temperature about 10єC (50єF) lower when deciding the mixing rate.
Mixing rate of water and antifreeze 4-21 WARNING Kind of coolant Cleaning inside of cooling system and changing coolant Adding corrosion resistor agent KI 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. Non permanent type antifreeze containing ethylene glycol (winter, one season type) Every 6 months (spring, autumn) (Drain antifreeze in spring, add antifreeze in autumn) When not using antifreeze Every 6 months or every 1000 hours whichever comes first Min.
atmospheric temperature ºC Above -10 -15 -20 -25 ºF Above 14 5 -4 -13 Amount of antifreeze Liter 1.9 2.3 2.7 3.0 US gal 0.50 0.61 0.71 0.79 Amount of water Liter 4.6 4.2 3.8 3.5 US gal 1.22 1.11 1.00 0.92