4 engine oil・coolant・fuel, Operation, 4 engine oil ・ coolant ・ fuel – MMD Equipment 400S-6B1 User Manual
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4. Operation
4-8
4.4 Engine Oil・Coolant・Fuel
4.4.1 Engine Oil
Viscosity of engine oil greatly affects startability, performance, oil consumption of the engine, as well
as wear of the moving parts.
Choose appropriate oil based upon the table below according to the outside air temperature.
Relation between viscosity (SAE) and temperature
SAE Viscosity number
Temperature
Komatsu EO10W-30-DH
-4°F to 104°F (-20℃ to 40℃)
Komatsu EO15W-40-DH
5°F to 122°F (-15℃ to 50℃)
Komatsu EO30-DH
32°F to 104°F (0℃ to 40℃)
Be sure to use DH class engine oil or superior class. (Using engine oil with poor quality may shorten the
life of the engine).
When two or more different brands of oil are mixed, its performance can be deteriorated. Do not mix oils.
Follow the designated regulations to dispose of engine oil.
4.4.2 Coolant
Use soft water of good quality such as tap water for coolant.
When water with dirt, sand, and/or dust contained, or hard water such as well water (ground water) is
used, this will cause deposits inside radiator or on cylinder head, and will cause engine overheat due to
poor flow of coolant.
When the unit is used in a cold region and possible freezing is expected, it is recommended to use LLC
(Antifreeze) for the coolant.
Adjust mixing ratio of LLC with water according to the temperature.
Use LLC within the range of its mixing ratio between 35 and 60%.
If LLC in the water exceeds more than 60%, it may decrease its antifreezing effect.
Reference of LLC mixing ratio
Temperature Mixing
ratio
-4°F (-20℃) 35%
-104°F (-40℃) 55%
Follow the designated regulations to dispose of LLC (Antifreeze).
4.4.3 Fuel
Be sure to use diesel fuel oil.
（
Using other oil will cause low power output or damage the engine.）
As for fuel, use diesel fuel oil (having higher than 45 cetane number).
Use of diesel fuel oil having lower than 45 cetane number will cause inferior function to engine and,
what is worse, it will cause serious accident to the engine.
Quality of coolant and antifreeze
Choose appropriate
fuel