The following are the precautions and countermeasures when the air compressor is at high temperature:

I. Emergency Shutdown and Safety Inspection
- ** Immediate shutdown ** : If the temperature of the air compressor continuously exceeds the rated high-temperature threshold (usually 80-100℃, please refer to the equipment manual for details), the emergency shutdown button should be pressed immediately to prevent serious damage to the equipment such as bearing sintering and motor burnout due to overheating.
- ** Cut off power supply ** : After the machine stops, the main power supply must be cut off to prevent secondary faults caused by misoperation. A "Under Maintenance" warning sign should be hung to ensure personnel safety.
- ** Do not open the cover for inspection ** : After the machine stops, the interior of the equipment is still in a high-temperature state. At this time, do not immediately open the box or radiator cover of the air compressor to avoid scalding caused by high-temperature oil and gas spraying out. Wait until the equipment temperature drops below 50℃ before conducting the inspection.


Ii. Investigation and Handling of High-temperature Causes **
(1) Cooling system failure
- Check the coolant (lubricating oil)
Insufficient liquid level: Check the oil level mirror. If the liquid level is below the lowest mark, add the same type of coolant (confirm whether the oil has emulsified or deteriorated. If it has deteriorated, all of it needs to be replaced).
Oil quality issue: If the coolant has been in use for longer than the recommended period (typically 6,000 to 8,000 hours), its heat dissipation effect may decline due to oxidation and contamination. It is necessary to replace it in a timely manner and clean the oil circuit system.
Cooler blockage ** : Remove the cooler (water-cooled or air-cooled) and check if there is any accumulation of oil, scale or dust inside. Water coolers can be cleaned by circulating with dedicated cleaning agents (such as descaling agents), while air coolers can be cleaned by blowing the heat dissipation fins in reverse with compressed air to remove blockages.
- Check the cooling fan/water pump
- ** Fan failure ** : If the fan does not rotate or rotates at too low a speed, it may be due to motor burnout, belt slippage or fan blade damage. In such cases, the motor needs to be replaced, the belt tension adjusted or the blades replaced.
- ** Abnormal water pump ** : In the water cooling system, wear of the water pump impeller or leakage in the pipeline can lead to insufficient coolant flow. It is necessary to inspect the water pump seal, replace the impeller, and check for leakage points in the pipeline.
- Check the heat dissipation environment
- ** Poor ventilation ** : The air compressor should be installed in a well-ventilated area. If there is a pile of debris around or the air inlet is blocked, it will cause poor air circulation for heat dissipation. Obstacles within 1 meter around should be cleared to ensure that the air inlet and outlet are not blocked.
- ** Excessively high ambient temperature ** : When the ambient temperature exceeds 40℃, the heat dissipation efficiency of the air compressor will drop significantly. You can install exhaust fans or air conditioners to lower the ambient temperature, or install air ducts on the top of the equipment to lead the hot air out to the outside.

(2) Abnormalities in mechanical components
- ** Bearing wear ** : Excessive wear of the bearing can cause frictional heat generation, and abnormal noises can be heard during operation. The equipment needs to be disassembled to check the bearing clearance. If the wear is severe, the bearing should be replaced and new grease should be added (note the model matching).
- ** Rotor jamming/Friction ** : Carbon deposits on the air compressor rotor, foreign objects entering, or too small a fit clearance may cause the rotor to heat up due to friction. The machine needs to be disassembled to clean the carbon deposits, check the wear on the rotor surface, and grind or replace the rotor assembly if necessary.
- ** Belt too tight ** : If the tension of the drive belt is too high, it will increase the load on the motor and cause the temperature to rise. The belt tension should be adjusted to the recommended value in the manual (usually, it is advisable to press the middle of the belt to sink by 10-15mm).

(3) Other factors
- ** Air filter clogging ** : Clogging of the air filter will increase the intake resistance, raise the load on the air compressor, and cause the temperature to rise. It is necessary to clean or replace the air filter regularly (it is recommended to blow it every 500 hours and replace it every 2000 hours).
- ** Improper setting of pressure switch ** : If the air compressor operates for a long time at a pressure higher than the rated pressure, it will cause the motor to overload and overheat. It is necessary to check the setting value of the pressure switch and adjust the exhaust pressure to the specified range (such as 0.7-0.8MPa).
- ** Sensor failure ** : False alarms from temperature sensors may cause "false high temperature" shutdown. You can use a multimeter to check if the sensor resistance value is normal. If it is abnormal, replace the sensor and recalibrate the temperature control system.


Iii. Daily Maintenance Measures for Preventing High Temperatures **
- Regular maintenance
Replace the coolant, air filter and oil filter periodically (usually every 2,000 to 4,000 hours) to prevent impurities from blocking the oil passage or affecting heat dissipation.
Check whether the pipes and joints of the cooling system are leaking, and replace the aged sealing rings or pipes in time.
- Monitor operating parameters
Before starting up the machine every day, check parameters such as the oil level, coolant temperature, and exhaust pressure. During operation, monitor the temperature changes in real time through the control panel. If an abnormal temperature rise rate is detected (such as an increase of more than 5℃ per minute), stop the machine immediately for inspection.
- "Optimize the operating environment.
Keep the computer room dry and clean. Regularly clean the dust on the surface of the air compressor and the radiator. It is recommended to blow the radiator with compressed air once a week.
For scenarios where multiple air compressors operate in parallel, it is necessary to ensure that the distance between the equipment is no less than 1.5 meters to avoid heat accumulation.
- "Train operators.
Operators must be familiar with the equipment operation procedures and master the emergency handling process for high-temperature alarms to avoid the expansion of faults due to misoperation.


Iv. Recheck of Equipment after High temperature
After troubleshooting and restarting the machine, it is necessary to observe the operating status of the equipment:
Check whether the temperature is stable within the normal range (usually 30-40℃ higher than the ambient temperature). If high temperature occurs again, re-examine to see if there are any overlooked fault points (such as residual air in the oil circuit not being discharged, incomplete cleaning of the cooler, etc.).
Record the cause and handling process of this high-temperature failure as the equipment maintenance file to facilitate targeted maintenance in the future and reduce the risk of repeated failures.

If the high-temperature problem of the air compressor occurs frequently or cannot be solved after self-inspection, it is recommended to contact professional maintenance personnel or technical support from the manufacturer to avoid further damage to the equipment due to improper operation.