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Filter element
● All filter elements shall be replaced regularly. But during working in harsh conditions, the filter element shall be replaced
in a short term according to the lubricating oil and fuel (sulfur content) used.
● Do not reuse the cleaned filter element (filter element type). Replace it with a new one.
● During replacing the filter element, check whether there are metal particles adsorbed on the old filter element. If so,
please contact your Yuchai dealer.
● Before use, do not open the package of the back-up filter element.
Hydraulic system
● During and after work, the hydraulic system is under high temperature. And it is still under high pressure during
operation. Therefore, pay special attention to waiting for the temperature to drop and release the pressure in the hydraulic
cylinder pipeline when checking and maintaining the hydraulic system.
● During loosening plugs, screws or hose joints, do not stand in front of the parts. Before disassembling, loosen them
gradually to release the internal pressure.
● During inspecting or maintaining the hydraulic oil circuit, be sure to discharge the air to release the internal pressure.
● The inspection or maintenance of the hydraulic system includes: checking the hydraulic oil level, replacing the filter
element and filling hydraulic oil.
● During removing the high-pressure hose, check whether the O-ring is damaged. If so, replace it.
● During disassembling parts at the position sealed by O-rings or gaskets, clean the installation surface and replace with
new parts.
● During installing the hose, it is not allowed to twist or bend the hose into a small diameter circle. This will damage the
hose and significantly shorten the service life of the hose.
Electrical system
● It is very dangerous if the electrical equipment gets damp or the insulation layer of wires is damaged. This will cause
electric leakage and machine failure. Do not flush the cab interior with water. During flushing the machine, prevent the
water from flowing into the electrical parts.
● Electrical system maintenance: check and maintain the battery electrolyte level; Replace various bulbs; Replace fuses,
relays, etc.
● Do not install any electronic components other than those specified by Yuchai Heavy Industry.
● During working on the beach, clean the electrical system carefully to prevent corrosion.
● When installing the cab air cooler or other electrical equipment, it shall be connected to a special power connector. The
optional power source shall not be connected to a fuse,
start switch or battery relay.
Summary of Contents for U27
Page 1: ...U27Hydraulic Excavator Instruction Manual Guangxi Yuchai Heavy Industry Co Ltd...
Page 5: ...1 1 Preface...
Page 17: ...2 1 Safety regulations...
Page 44: ...3 1 Parts introduction...
Page 49: ...3 6 Panel meter Oil level pointer Timing display Water temperature pointer Indicator area...
Page 55: ...4 1 Operation guide...
Page 89: ...5 1 Maintenance...
Page 130: ...6 1 Accessories guide...