MAINTENANCE NOTES The quantity of antifreeze to be added to the coolant depends on the minimum temperature in the place where the machine is working. Keep to the following reference table: QUANTITY OF ANTIFREEZE TO BE ADDED TO THE WATER Use drinkable water and in any case soft water. Do not use corrosion inhibitors containing soluble oil, since they damage the rubber couplings. In case of doubt, contact your Komatsu Utility Dealer. 4.2.1.3 FUEL Always use fuel suitable for the engine. Other fuels with different specifications may damage the engine or re- duce its power. Always refuel at the end of the work day.
When refuelling, make sure that there is no water on the fuel drum cover and take care not to draw the conden- sate from the drum bottom. If fuel runs out, or if the fuel filter has been replaced, it is necessary to bleed the circuit. 4.2.2 NOTES REGARDING THE HYDRAULIC SYSTEM Be extremely careful when performing maintenance operations on the hydraulic system, since soon after work the oil is very hot. The circuit is pressurized not only during work, but also at the end of work. The maintenance operations required for the hydraulic system are the following: 1 - Daily check of the oil level in the tank. 2 - Periodical change of the oil filter.
3 - Periodical change of the oil and cleaning of the suction filter. Always bleed the circuit after changing the oil filter or the oil. When a component is removed from the circuit, check the gaskets and O-rings and change them if they are damaged. When a cylinder or a component of the hydraulic circuit is removed, after reassembly bleed the circuit by pro- ceeding as follows: 1 - Start the engine and let it idle. 2 - Make all the cylinders perform 4ч5 movements, stopping them at approx. 100 mm from the end of their stroke. 3 - Slowly make all the cylinders reach the end of their stroke for 3ч4 times.
145 Minimum ambient temperature (°C) -4 -6 -9 -12 -16 -20 -26 -32 -36 Quantity of antifreeze (l) 1.4 2.1 2.8 3.5 4.2 4.9 5.6 6.3 7 Quantity of water (l) 12.6 11.9 11.2 10.5 9.8 9.1 8.4 7.7 7