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4-32
Fault
Reason
Solution
4. The engine is overheated
• The coolant level is too low
• Add coolant
• Temperature sensor failure
• Replace with a new sensor
• Air filter is blocked
• Clean the air filter
• The fan belt is loose or out of order
• Re-tighten or replace
• There is dirt in the cooling system channel
• Cleaning channel
• Inferior oil or too much oil
• Replace the oil
5. The oil pressure is too low
• The oil level is too low
• Refill the fuel
• The fuel filter is blocked
• Clean oil filter
• Pipeline leakage
• Tighten or replace
• The engine cooling water temperature is too high
• Prepare the mixing ratio of the coolant correctly or consult the
local company's agent
6. The engine emits gray and
black smoke
• Poor fuel quality
• Use the correct fuel
• Air filter is blocked
• Replace the filter element
• Incorrect injection timing
• Adjust according to the specified value
• Poor nozzle atomization
• Inspect and replace parts
7. The engine emits white
smoke
• Poor fuel quality
• Use the correct fuel
• Excessive engine oil
• Restore the recommended oil level
• Incorrect injection timing
• Adjust according to the specified value
• There is water in the cylinder and in the fuel
• Check and change fuel
8. The battery cannot be
charged
• The connection is loose or rusty
• Clean or tighten
• The generator belt is loose or faulty
• Tighten or replace
• The generator does not charge
• Consult the company's agent
• Battery electrolyte failure
• Replace battery
• Battery electrode plate failure
• Replace battery
9. The starter does not work
or rotates slowly
• The connection is loose or rusty
• Clean or tighten
• Insufficient battery charge
• Replace
• The line is damaged
• Consult the company's agent
10. The engine is running and
the generator warning light is
on
• Generator failure
• Consult the company's agent
• Electronic regulator failure
• Replace
• The line is faulty
• Overhaul
11. The hydraulic system
components move too slowly
• Hydraulic oil cooling
• Manipulation action heats up
• The pilot system pressure is too low
• Consult the company's agent
• Wrong use of hydraulic oil
• Use the correct hydraulic oil
• The engine speed is too slow
• Consult the company's agent
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...