MAINTENANCE
3-4 WB140-2N, WB150-2N
COOLANT
• Engine coolant serves to keep the engine at the correct temperature and therefore to ensure optimal operating conditions;
check coolant level in the expansion tank daily and top off if necessary.
• The quantity of antifreeze to be added to the coolant depends on the minimum temperature in the place where the machine
is working.
Use the following table:
• Use water which has low mineral content.
• Do not use corrosion inhibitors containing soluble oil, since they damage the rubber couplings.
• In case of doubt, contact your Komatsu Dealer.
FUEL
• Always use fuel suitable for the engine. Other fuels with different specifications may damage the engine or reduce its
power.
• Always refuel at the end of the work day.
• When refueling, make sure that there is no water on the fuel drum cover and take care not to draw condensation from the
drum bottom.
• If fuel runs out, or if the fuel filter has been replaced, it is necessary to bleed the circuit.
NOTES REGARDING THE HYDRAULIC SYSTEM
• Be extremely careful when performing maintenance on the hydraulic system, since the oil is very hot.
The system is pressurized not only during work, but also at the end of work.
• The maintenance operations required for the hydraulic system are the following:
1. Daily check the oil level in the tank.
2. Periodically change the oil filter.
3. Periodically change the oil and clean the suction filter.
• Always bleed (purge) the system after changing the oil filter and the oil.
• When a component is removed from the circuit, check the gaskets and o-rings and change them if they are damaged.
• When a cylinder or a component of the hydraulic system is removed, after reassembly bleed the system by proceeding as
follows:
1. Start the engine and let it idle.
2. Make all the cylinders perform 4-5 movements, stopping them at approximately. 100 mm (4 in) from the end of their
stroke.
3. Slowly make all the cylinders reach the end of their stroke for 3-4 times.
Quantity Of Antifreeze To Be Added To The Water
Minimum ambient temperature
° C -4 -6 -9 -12 -16 -20 -26 -32 -36
° F 25 21 15 10 3 -4 -15 -26 -33
Quantity of antifreeze
Liter 1.4 2.1 2.8 3.5 4.2 4.9 5.6 6.3 7
US gal 0.37 0.55 0.74 0.92 1.11 1.29 1.48 1.66 1.85
Quantity of water
Liter 12.6 11.9 11.2 10.5 9.8 9.1 8.4 7.7 7
US gal 3.33 3.15 2.96 2.78 2.59 2.41 2.22 2.04 1.85
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