Komatsu — 4.7.12.b CHANGING THE COOLANT

MAINTENANCE PLAN RWA34760 204 4.7.12.b CHANGING THE COOLANT  DANGER • Soon after the machine has been stopped the coolant is very hot and under pressure and it may cause serious burns; let the engine cool down until it reaches approxi- mately 40÷45°C before changing the coolant. • Slowly loosen the radiator cap, in order to release the re- sidual pressure. • Oils, filters, the coolant and the battery are considered    special waste and must be collected and disposed of ac- cording to the anti-pollution regulations in force.

    DANGER • Soon after the machine has been stopped the coolant is very hot and under pressure and it may cause serious burns; let the engine cool down until it reaches approxi- mately 40÷45°C before changing the coolant. • Slowly loosen the radiator cap, in order to release the re- sidual pressure. • Oils, filters, the coolant and the battery are considered special waste and must be collected and disposed of ac- cording to the anti-pollution regulations in force.

 IMPORTANT • The following operations refer to the change of permanent coolants; if the coolant is water or water with antifreeze, which are used according to the season, it is necessary to wash the cooling circuit in order to eliminate any encrus- tation. (See “4.7.1.d WASHING THE COOLING CIRCUIT”). 1 - Open the engine hood (See “14.1 ENGINE HOOD”). 2 - Loosen and remove the upper cap (1) of the radiator. 3 - Open the radiator drain cock (2) (see Fig. A), loosen the drain valve (3) positioned on the filter carrier head and let the fluid flow out, collecting it in a container with suitable capacity (re- member that the capacity of the cooling system is approxi- mately 14 liters).

Use 12 mm spanners. 4 - Close the radiator drain cock (2) (see Fig. B), tighten the valve (3) on the filter carrier head and fill the radiator with new fluid. (See “4.3 FUEL, COOLANT AND LUBRICANTS”). 5 - Start the engine and let it idle for a few minutes; check the level again and top up before putting back the upper cap (1).