MAINTENANCE EVERY 50 OPERATING HOURS MAINTENANCE EVERY 50 OPERATING HOURS All maintenance operations to be performed after 10 hours of operation also fall into this maintenance category. CHECKING COOLING SYSTEM, COOLANT LEVEL IN THE RADIATOR AND EXPANSION TANK Danger of scalding! The coolant is pressurized when the engine is hot. Hot coolant can spray out, when opening the radiator cap. Check the coolant level only, when the engine has cooled down. Somewhat turn the cap (arrow) slowly to release the pressure. Fire! The anti-freeze can ignite when it contacts hot en- gine parts. Wait until the engine has cooled before topping off with anti-freeze. 1. Stop the engine and let it cool down. 2.
Open the engine cover. 3. Turn the radiator cap (arrow) slowly to the first stop and let the pressure escape. Then press the cap down and turn fur- ther to remove. 4. Check that the radiator is filled up to the overflow with cool- ant. If not then top off to the overflow with coolant. 5. After topping off, fit the radiator cap and tighten. 6. Check that the coolant level in the expansion tank is be- tween the marks full and low. 7. Top off to the full mark if required. 8. After topping off, refit the tank cap and tighten. 75_202 When coolant has been topped off: - Start the engine and fully open the heater. - Run the engine until warm. Check points 1 to 5 again.
If coolant has to be topped off regularly in the radiator or expansion tank, then the system should be checked by your local Komatsu dealer and repaired if required. 7-40