![background image](http://html2.mh-extra.com/html/yuchai/u27/u27_instruction-manual_4668501088.webp)
4-34
Fault
Reason
Solution
19. Abnormal walking
• The track is too tight or too loose
• Re-adjust
• Oil pump performance is reduced
• Consult the company's agent
• Crawler frame deformation
• Repair or replace
• There are gravel or rocks in the track chain
• Removal and repair
• Control valve leakage
• Consult the company's agent
• Motor performance is reduced
• Consult the company's agent
20. Abnormal rotation
• Oil pump performance is reduced
• Consult the company's agent
• Rotary motor is damaged
• Consult the company's agent
• The pilot valve does not work
• Consult the company's agent
21. Rotation is not
continuous
• Rotary gear wear
• Consult the company's agent
• Rotary support or ball is damaged
• Consult the company's agent
• Lack of grease
• Consult the company's agent
• Control valve leakage
• Consult the company's agent
22. Air conditioning system
noise
• The electrical connector is loose, causing abnormal noise of the
clutch
• Insert the connector tightly or repair it accordingly
• Belt loose
• Tighten appropriately, replace if damaged
• Blower blades are loose
• Reassemble tightly
• The blower is not working properly
• Repair or replace
• The electronic fan is not working properly
• Repair or replace
• The compressor bearing is damaged
• Replace
• The tensioner bearing is damaged
• Replace
23. The air conditioner is not
cooling
• Electrical circuit failure
• Repair or replace
• Air conditioner switch failure
• Repair or replace
• No refrigerant
• Leak detection, repair, and refrigerant charge
• System blockage
• Clean or replace
• Belt loose or broken
• Adjust or replace
• Expansion valve failure
• Clean or replace
• The compressor operates abnormally
• Repair or replace
• Pressure switch failure
• Replace
24. Sometimes there is no
cold air
• Poor line contact
• Overhaul
• Belt loose
• Adjust the belt appropriately
• Improper adjustment of air conditioner switch cooling
• Re-adjust
• The system contains too much water and the internal ice is
blocked
• Replace the drying bottle
• The electronic fan or its relay is damaged
• Repair or replace
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...