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4. Check the oil injection pressure
Check every 500 hours.
The injection pressure should be checked regularly at the intervals shown in the maintenance table. Adjust if necessary.
This inspection shall be carried out by our agency!
The working efficiency of the engine basically depends on the working condition of the fuel injection nozzle, so it must be
maintained regularly to ensure its normal operation.
In order to better use the engine, the excavator driver should pay attention to the signs indicating that the fuel injection
nozzle does not work well:
A. Impact sound coming from single cylinder or multicylinder; B. Engine overheating; C. Reduced efficiency; D. Black
exhaust; E. Increased fuel consumption.
These signs may also be caused by the following reasons, so the following inspections should be carried out first:
A. The air inlet and exhaust valves are not well sealed; B. The fuel injection nozzle is not adjusted correctly; C. The fuel
filter is dirty or damaged; D. Poor fuel quality;
E. There is water in the fuel; F. The air filter is dirty or blocked.
5. Discharge the fuel circuit
During the replacement of fuel filter element, disconnecting of the fuel line, cleaning the fuel filter, or the fuel tank is
unintentionally emptied, if air flows into the fuel circuit, it shall be exhausted before restarting the engine.
1) Open the exhaust screw on the fuel filter seat;
2) Operate the filler plug of the filling pump until there is
no air in the fuel flowing out from the exhaust screw;
3) Close the exhaust screw on the fuel filter seat;
Warning: The fuel pressure in the high pressure fuel pipe is sufficient to penetrate the skin
and may cause serious personal injury.
Wear gloves and protective clothing before operation.
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...