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The normal working temperature of hydraulic oil is 50°C~80°C. Operating the hydraulic oil below 20°C will damage the
hydraulic components. Therefore, if the oil temperature is lower than 20°C before starting work, the following preheating
process must be followed.
1) The engine runs at a speed greater than 200 rpm for 5 minutes.
2) Put the engine throttle in the middle position and run for 5-10 minutes.
3) At this speed, extend and retract each cylinder several times, and gently operate the rotation and travel motors to
preheat them. It can only work when the oil temperature reaches above 20°C. When necessary, the bucket cylinder can
be extended or retracted to the end of the stroke, and the hydraulic oil can be preheated at full load, but it does not
exceed 30 seconds each time. It can be repeated until the oil temperature requirement is reached.
B. Inspection after starting the engine
1) Check whether the indicator lights are off.
2) Check for oil leakage (lubricating oil, fuel) and water leakage.
3) Check if there is any abnormality in the sound, vibration, heating, smell, and instrument of the machine. If any
abnormality is found, repair it immediately.
4. Turn off the engine
Note: If the engine is suddenly turned off before it cools down, it will greatly shorten the service life of
the engine. Therefore, except in emergency situations, do not turn off the engine suddenly.
If the engine is overheated, don't shut it down suddenly, but run at a medium speed to gradually cool
the engine, and then shut down the engine.
1) Run the engine at low idle speed for about 5 minutes to allow it to gradually cool down.
2) Push the throttle forward to the end, and pull the shutdown handle back to the end.
3) Turn the key switch to the OFF position and turn off the engine. Each indicator light goes out.
4) Remove the start switch key.
5) After stopping the engine, push the shutdown handle forward to the end.
5. Inspection after turning off the engine
1) Patrol and inspect the working device, the outside of the machine, and the chassis and check for
water or oil leakage. If an abnormality is found, repair it.
2) Fill the fuel tank with fuel.
3) Check whether there are paper scraps and debris in the engine room. Remove paper scraps and
debris to avoid fire.
4) Remove the mud attached to the chassis.
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...