Yuchai U27, Instruction Manual

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5-2
Common sense for maintenance
New machine running in
The first 100 hours of the machine is the running-in period. Be careful to use during this period, and do not allow the
machine to do some work that is overloaded or work-intensive. And only 80% of the work load shall be allowed for 50
hours before the running-in period. The quality of use during the running-in period affects the service life of the machine.
After the first 50 hours of work, the machine shall be inspected and maintained for the first time in accordance with the
inspection and maintenance table. At the same time, the pollution degree of the hydraulic oil shall be checked, and its
value cannot be greater than NAS9. Otherwise, replace with new hydraulic oil.
If the hydraulic system does not work, the engine cannot be operated at high speed. Only if the temperature of the
hydraulic oil exceeds 20 degrees Celsius, the working device can be operated.
Construction in a dusty site
During working in a dusty workplace, follow the below steps:
● Clean the radiator core frequently to avoid clogging.
● Frequently clean and replace the fuel filter element.
● Clean the electrical components, especially the starter motor and alternator to avoid accumulation of dust.
● During checking or replacing the oil, move the machine to a dust-free place to prevent dust from entering the oil.
Oil and filter element
Please use clean engine oil and grease, and prevent impurities from entering the engine oil container.
After replacing the oil or the filter element, check the waste oil and filter element for metal chips or impurities. If a large
amount of metal chips or impurities are found, report it to the person in charge of the machine and take appropriate
measures.
Do not mix oils of different grades. If oil of a different grade is required to be filled, drain the old oil and replace it with oil of
a new grade.
Timer reading
Check the timer on the dashboard every day to check if it is time for maintenance according to the number of working
hours.
Use original accessories
The use of original Yuchai accessories is an important factor in ensuring the normal operation of the machine and
prolonging the service life of the machine.