AIR COMPRESSOR 612600130430 suitable for Wei chai WD615 Engine Spare Parts 

9 common faults and solutions of air compressors

　　 1. The air compressor suddenly stops during operation

　　The reasons are:

　　(1) The suction pressure is too low, which is lower than the low pressure lower limit of the pressure relay;

　　 (2) Exhaust pressure is too high, causing the high-voltage relay to operate and power off;

　　 (3) The oil pressure is too low, and the oil pressure relay acts as a relay;

　　 (4) Motor overload, thermal relay action relay;

  elimination method:

　　(1) Check the reason. If the pipeline is blocked, the pipeline should be unblocked. If the system refrigerant is insufficient, add it;

　　(2) Check the cooling capacity or cooling air volume of the condenser;

　　(3) Check the pipelines and pumps of the oil delivery system;

　　(4) Check whether the power supply voltage is low or the cooling load is too large;

　　 2. Exhaust gas compression is too high

　　The reasons are:

　　(1) The cooling water volume of the water-cooled condenser is insufficient or the cooling air volume of the air-cooled condenser is insufficient;

　　 (2) The surface of the condenser tube cluster is too thick or oily, which causes difficulty in heat dissipation;

　　(3) There is air in the refrigeration system;

　　 (4) Overfilling of refrigerant;

　　(5) The valve in the exhaust pipe fails, causing the pressure to be too high;

  elimination method:

　　(1) Check whether the valve is fully open, increase the water supply or check the motor voltage, speed, and whether the transmission belt is too loose;

　　 (2) Clean the scale and brush the oil stains to make the surface of the condenser tube clusters clean;

　　 (3) let out the air;

　　 (4) Exhaust excess refrigerant;

　　(5) Check and correct the valve;

　　 3. Causes the wet stroke of the air compressor

　　The reasons are:

　　 (1) The thermal expansion valve fails and the opening is too large;

　　 (2) The solenoid valve fails, a large amount of refrigerant enters the evaporation pipe after the shutdown, and enters the air compressor when it is turned on again;

　　(3) The system is filled with too much refrigerant;

　　 (4) The temperature sensing bulb of the thermal expansion valve is loose and not tied, causing the opening of the thermal expansion valve to increase;

  elimination method:

　　 (1) Close the liquid supply valve and overhaul the thermal expansion valve;

　　(2) Overhaul the solenoid valve;

　　 (3) release excess refrigerant;

　　 (4) Check the binding of the temperature Sensor bag;

　　 4. The air compressor is stuck

　　The reasons are:

　　 (1) There are dirty impurities in the lubricating oil;

　　 (2) The oil pipe of the oil pump is blocked, causing the Cylinder to run out of oil and the piston is stuck;

　　 (3) The shank pin of the main gear of the oil pump inserted into the crank is twisted, causing the oil system to cut off;

  elimination method:

　　(1) Replace with new lubricant;

　　(2) Repair the oil pump pipeline;

　　(3) Repair and replace the main gear shaft of the oil pump;

　　 5. There is a strange sound in the cylinder

　　The reasons are:

　　(1) The dead center clearance in the cylinder is too small;

　　 (2) The clearance between the piston pin and the connecting rod bushing is too large;

　　(3) The valve plate is broken;

　　(4) The sound of oil hitting caused by the crankshaft crank or the big end of the connecting rod;

  elimination method:

　　(1) Adjust the thickened cylinder gasket;

　　 (2) Replace the piston pin or bushing;

　　(3) Shut down immediately to replace the valve;

　　 (4) It is not necessary to shut down for a short time, such as stopping for inspection after a few minutes;

　　 6. There is sound in the crankcase

　　The reasons are:

　　(1) The connecting rod nut is loose;

　　 (2) The gap between the connecting rod and the bearing bush is too large;

  elimination method:

　　 (1) Stop and re-tighten;

　　(2) Replace the tiles;

　　7. The air compressor does not start

　　The reasons are:

　　(1) The fuse is in poor contact or blown out when the power is off;

　　 (2) Poor contact of the vertical contact point of the starter;

　　(3) The temperature controller is out of adjustment or malfunctions;

　　(4) The adjustment of the pressure relay is not suitable;

  elimination method:

　　(1) Check the power supply and fuse;

　　 (2) Check the starter and clean the contacts with gauze;

　　 (3) Check the temperature indication position and check the various components;

　　(4) Check the components or setting values of the pressure relay;

　　 8. The air compressor has insufficient cooling capacity

　　The reasons are:

　　 The piston ring is worn or the gap between the piston and the cylinder is too large due to wear;

  elimination method:

　　 Replace with new piston ring or overhaul with new parts;

　　 9. There is noise in the air compressor and motor coupling

　　The reasons are:

　　 (1) The air compressor and the motor coupling are not properly matched;

　　(2) The key and the keyway of the coupling are not properly matched;

　　(3) The elastic ring of the coupling is loose or damaged;

　　(4) The belt is too loose;

　　(5) The inner hole of the coupling and the shaft fit loosely;

  elimination method:

　　(1) Reassemble according to the correct assembly requirements;

　　 (2) Adjust the fit of the key and the keyway, change the key;

　　(3) Fasten the elastic ring or replace it with a new one;

　　(4) Adjust and tighten the belt;

　　(5) Adjust and tighten the coupling;