Yuchai U27, Instruction Manual

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5-4
Maintenance summary
Lubricating oil
● Use oil that meets the grade and temperature given in the "Oil Selection Table" in this manual. In due time, the oil shall
be replaced even if the oil is not dirty.
● Take care to prevent impurities (water, metal particles, dust, etc.) from entering the lubricating oil. Most of the problems
of the machine are caused by the ingress of impurities.
● Do not mix lubricating oils of different grades.
● Fill the oil according to the specified amount. Too much oil or too little oil can cause malfunctions.
● During replacing the oil, be sure to replace the relevant filter element, especially during replacing the oil filter element,
charge fresh and clean engine oil that meets the requirements into the new filter element before installation.
Fuel oil
● During storing or filling fuel, take special care not to let impurities enter.
● Be sure to use the fuel specified in the "Fuel Selection Table" in this manual. The fuel shall be selected according to the
ambient temperature, otherwise it will easily solidify at low temperatures (especially below -15°C (5°F)). Therefore, it shall
be replaced with the fuel applicable to the ambient temperature.
● In order to prevent moisture in the air from condensing and forming water in the fuel tank, fill the fuel tank up after the
daily work.
● Before starting the engine, or 10 minutes after refueling, drain the sediment and water in the fuel tank.
● If the fuel of the engine is used up, or if the filter element is replaced, the air in the oil circuit shall be discharged.
Lubrication grease
● Grease is used to prevent distortion and noise at the connection.
● If any part appears inflexible or produces noise after long-term use, greasing shall be carried out.
● Wipe off the old grease squeezed out during greasing.
● Be careful to wipe off the old grease anywhere. Sand or dust sticking to the grease will cause wear of the rotating parts.
Coolant
● Antifreeze shall be used in any climate.
● Check the coolant level according to regulations, and add it in time if it is found to be insufficient. Insufficient coolant will
cause the engine to overheat.
● According to the ambient temperature, select a suitable mixing ratio of coolant and antifreeze.
● Do not add coolant if the engine is overheated or not yet cooled.