4-83
4.19
2000 HOUR INSPECTION & MAINTENANCE
PROCEDURES
Thoroughly read and understand "SAFETY PRECAUTIONS" of this manual before performing the inspection and
maintenance.
Perform this section together with "EVERYDAY CHECK-UP and 50, 100, 120, 250, 500, and 1000 HOUR
INSPECTION & MAINTENANCE PROCEDURES".
4.19.1
REPLACING COOLANT
HANDLING OF COOLANT
Do not loosen or remove the radiator cap when the coolant is under high pressure and temperature.
High temperature steam and the coolant will spray and could cause burns.
• When opening the radiator cap, wait until the coolant cools down, and then slowly turn and open the radiator
cap.
• The antifreeze is poisonous, so prevent it from contacting with skin. If the antifreeze gets into your eyes or on
your skin, flush the eyes or skin with plenty of water, and seek medical attention.
If air remains inside the coolant circuit, it will lead to damage of the machine. Perform the work according to the
procedure and do not allow the air to remain inside the coolant circuit.
Use the KOBELCO genuine antifreeze at 50 % concentration. Use clean water such as tap water for the water to be
mixed with the antifreeze.
• Use the specified antifreeze. If improper antifreeze is used, it will cause damage to the machine such as
occurrence of rust inside the coolant circuit.
• Do not mix and use different types of coolants.
• Replace the coolant earlier than the specified interval when it is dirty and/or bubbling.
1.
Move the machine to a level and firm place and lower the bucket to the ground.
2.
Stop the engine and move the pilot control shut-off lever to the "LOCKED" position.
3.
Loosen radiator cap (1) slowly. After checking that the pressure is completely released, push the cap down,
loosen it further, and then remove it.
Here is the radiator filler opening.
4.
Remove the under cover under the radiator, place a container for drain coolant, and open drain plug (2) and
drain plug (3) on the side face of the engine to drain the coolant.
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