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[2] CLEANING ENGINE COOLING SYSTEM
• Coolant will be at elevated temperatures immediately after engine operation, which urges you
not to drain coolant. Always perform coolant draining with the engine cold.
• Do not remove the radiator cap if radiator coolant is hot. Potential gush of boiling water may
occur if disregarded. Cap removal is allowed when the water drops in temperature. Be sure to
relieve internal pressure by slowly rotating the filler cap before cap removal.
• Do not stand in front of and behind the machine when starting the engine for cooling system
cleaning. Failure to stand aside of the machine may pose a danger in the event of a sudden
movement of the machine.
• Keep antifreeze from flame. Antifreeze is a flammable solution.
Do not smoke when handling antifreeze.
CAUTION
• Always use tap water for coolant. Contact us or our sales service agency if river water, well
water, or water through the small water-supply system is necessarily substituted for tap water.
• A mixing ratio of antifreeze is to be controlled by the concentration meter.
Cooling system cleaning and antifreeze replacement should conform to the cycles specified in the
following table.
Antifreeze type Cooling system cleaning and antifreeze replacement
Anti-corrosive all-season type Annually or every 1000 hours
Perform cooling system cleaning and antifreeze replacement with the machine in a horizontal position.
A mixing ratio of antifreeze varies with temperature. Antifreeze as a volume ratio is min. 30% to yield
anticorrosive effect.
The mixing ratio between water and antifreeze is to be determined with respect to past minimum
temperatures, in accordance with “Mixing ratio between water and antifreeze” shown below. For actual
mixing, set temperature 10 degrees lower than minimum temperature.
[MIXING RATIO BETWEEN WATER AND ANTIFREEZE]
Min. temperature (°C)
Mixed quantity (L)
Min. -15 -20 -25
Antifreeze 1.4 1.5 2.0
Water 3.1 3.0 2.5
• Antifreeze-mixed water drain pan: A 6-liter container
• Have a water filling hose available.
1. Place the machine on a level surface.
2. See “Operation 2.14 Outrigger Setting Operation” to rotate the
rotary of the “outrigger (1)” and “outrigger (4)” outward.
3. Remove the two mounting bolts (4) and remove the radiator top
cover (3).
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