coolant komatsu

MAINTENANCE FOWA

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MAINTENANCE COURSE

Coolant HandlingMAINTENANCE FOWA

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(Water)

1. Cooling circuit of an engine ........................................... 32. Example of rust, corrosion and erosion ............................. 43. Failure due to coolant pH .............................................. 54. Failure due to cavitation ............................................... 65. Failure due to scales ................................................... 76. Prevention of corrosion ................................................ 85 points to maintain cooling systemPoint 1 The best selection of coolant ................................... 10Point 2 How to get and use of genuine coolant ....................... 11Point 3 Check before starting engine ................................... 12Point 4 Cleaning of radiator fins ........................................ 13Point 5 Replacement interval ........................................... 14Conclusion .................................................................. 15

Contents

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Cooling condition is important

Heat efficiency

Engineoutput

Approx. 38%

Energyof fuel100%

Exhaust gas Approx. 32%

Heat released

with coolant

Approx.30%

1 Cooling circuit of an engine

42 Example of rust, corrosion and erosion

Rust and Corrosion Erosion of a thermostat housing

Cylinder liner

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Corrosion of aluminum radiator core tube

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3 Failure due to coolant pH

64 Failure due to cavitation

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ENGINESEIZURE

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5 Failure due to scales

Scales deposit• In the radiator tubes• On the oil cooler tubes• On the cylinder liners• In the cylinder heads• In the thermostat

Clogged radiator tubesOverheating

Piston

Cylinder liner

Seizure of piston and cylinder liner

86 Prevention of corrosion

Metal corrosion tests (conforming to the JIS K2234 tests)

•Komatsu Genuine SuperCoolant (coolnt:30%, artificial corrosive water:70%)

Cast aluminum Cast iron Steel Brass Solder Copper

•Blended solution (artificial corrosive water)

Cast aluminum Cast iron Steel Brass Solder Copper

KomatsuSupercoolant

AF-NAC preventsmetal corrosion.

5 pointsto maintain cooling system

10Point 1 The best selection of coolant

Capability items

Prevention of corrosion and rust on iron and brass

Prevention of corrosion andrust for aluminum

Prevention of cavitation and erosion

Inhibition of scale deposit

Antifreeze

1

2

3

4

5

LLC CR AF

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Using KomatsuSupercoolant

AF-NAC

Corrosionresister is

unnecessary

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Point 2 How to get and use of genuine coolant

Purchase Komatsu genuine SupercoolantAF-NAC from Komatsu distributor.No need to add water when filling.

Komatsu genuineSupercoolantAF-NAC 50/50 pre-diluted can beused at ambienttemperaturesfrom -30 to +50˚C.

Komatsu distributor

12Point 3 Check before starting engine

Do not open the radiator cap unnecessarily. When checking the coolant level, always waitfor the engine to cool down and check the level in the reserve tank.

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Before starting the engine each day

Check for leakage of coolant aroundthe engine.

Check if the coolant in reserve tank isbetween the FULL and LOW marks.If the coolant level is low, addKomatsu genuine SupercoolantAF-NAC ONLY to the FULL levelthrough the Filler port of reserve tank.

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Point 4 Cleaning of radiator fins

Clean radiator fins periodically

• If radiator fins are clogged, the engine may overheat and seize in the worst case.• Therefore periodical cleaning of radiator fins is recommended.

14Point 5 Replacement interval

Coolant should be replaced once for every 2 years or 4000 hours whichever comes first.

Life of Coolant Additives by Temperature��

2 years or

To keep the coolant temperature at the proper level while operating the machine;

Coolant leakage check (Point 3)Coolant level check (Point 3)Cleaning of radiator fins (Point 4)Fan belt check

Replacement interval

Replacement ofKomatsu Supercoolant AF-NAC

Replacement ofKomatsu Supercoolant AF-NAC

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4000h

Komatsu GenuieSupercoolant

Commerciallyavailable coolant

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Conclusion

Coolant must function to prevent corrosion andcavitation as well as freezing.

Komatsu Genuine Supercoolant AF-NAC isexcellent at preventing corrosion and cavitation,and has good antifreeze and cooling properties.It can be used for 2 years or 4000 hours withoutmaking replacement.

Komatsu Genuine Supercoolant AF-NAC isstrongly recommended for the cooling system.

www.Komatsu.com

HEN00020-00 Materials and specifications are subject to change without notice.is a trademark of Komatsu Ltd. Japan.

coolant komatsu

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