#screw-type air compressor #air compressor industrial #used air compressor sales
Reasons for common faults of air compressors and fault judgment and elimination methods
There are many types of air compressors, which can be divided into positive displacement compressors, reciprocating compressors, and centrifugal compressors according to their working principles; Car Maintenance Network (38831.com) summarizes the common fault causes of air compressors and their troubleshooting solutions. method
Fault phenomenon: The air compressor discharges without pressure air.
cause of issue:
1. The air compressor release valve is stuck. The valve plate is deformed or broken.
2. Excessive carbon deposits at the intake and exhaust ports.
Troubleshooting and troubleshooting methods:
1. Check the relief valve components, clean and replace the failed parts.
2. Disassemble and inspect the cylinder head, check the valve plate, and replace the deformed and broken valve plate.
3. Disassemble and inspect the cylinder cover, and clean the valve seat plate and valve plate.
Fault phenomenon: When the engine is running and the air compressor is inflating the air storage tank, the air pressure indicated by the air pressure gauge cannot reach the starting pressure value.
cause of issue:
1. The barometer fails.
2. The transmission belt between the air compressor and the engine is too loose and slips, or the pipeline between the air compressor and the air storage tank is ruptured or the joint leaks.
3. The oil-water separator, pipeline or air filter have too much sediment and are blocked.
4. The exhaust valve sheet of the air compressor is not tightly sealed, the spring is too soft or broken, the cylinder head bolts of the air compressor are loose, the blisters and the cylinder head gasket are damaged and the air leaks.
5. The cylinder liner, piston and piston ring of the air compressor are too worn or even leaked.
Troubleshooting and troubleshooting methods:
1. Observe the air pressure gauge. If the indicated pressure is insufficient, let the engine run at medium speed for a few minutes, and the pressure still does not rise or rises slowly. When the brake pedal is pressed, the sound of deflation is very strong, indicating that the air pressure gauge is damaged. Repair the barometer.
2. If the above test has no or very little sound of deflation, check whether the belt of the air compressor is too loose, from the air compressor to the air storage tank, to the control valve intake pipe, and whether the joints are loose, cracked or leaked. place.
3. If the air compressor does not inflate the air storage tank, check whether the oil-water separator, the air filter and the pipeline are blocked by too much dirt. If it is blocked, the dirt should be removed.
4. After the above inspection, if the cause of the failure cannot be found, you should further check whether the exhaust valve of the air compressor is leaking, whether the spring is too soft or broken, whether the cylinder head has blisters, and whether the gasket is damaged. failure to replace or repair damaged parts. 38831.com
5. Check whether the cylinder liner and piston ring of the air compressor are excessively worn.
6. Check and adjust whether the installation direction of the unloading valve is consistent with the direction marked (arrow).
Fault phenomenon:
1. Oil overflows from the air filter and the exhaust port.
2. Excessive oil overflows when the air storage tank (wet) is drained.
cause of issue:
1. The inhalation is blocked or the air intake is poorly filtered.
2. Oil return is blocked.
3. The cylinder liner of the air compressor, the piston and the piston ring are worn too much, or the oil ring is installed backwards, stuck and the lubricating oil flows up.
4. The cooling of the air compressor is not complete.
5. Dirt is not often discharged from the gas tank.
6. The air compressor runs for too long.
7. The pressure of the engine crankcase is too high.
8. The engine oil pressure is too high.
9. Deterioration of lubricating oil.
10. The air compressor is defective.
Troubleshooting and troubleshooting methods:
1. Check the air compressor filter, if there are damaged, defective or unclean air filter elements, replace the damaged parts in time; check whether the air compressor intake pipe is kinked or deformed, and ensure that the intake pipe has the minimum required inner ring diameter (Above 15.9mm is recommended).
2. Check whether there are excessive bends, kinks and obstacles in the oil return pipe. The recommended minimum inner diameter of the oil return pipe is (12mm). The oil return line must descend all the way from the compressor to the engine crankcase.
3. Check and measure the wear, damage and assembly of the cylinder liner and piston ring of the air compressor. Those with serious wear should be replaced.
4. For the air cooling part of the air compressor, it is necessary to: remove the oil, soot or unclean objects accumulated on the heat sink. If damaged parts are found, they should be replaced; if damaged heat sinks are inspected, damaged parts should be replaced. For the water cooling part of the air compressor, it is necessary to: check the appropriate cooling pipe size (the recommended minimum diameter of the pipe is 9.5 mm), check the coolant circulation of the air compressor, when the engine is adjusting the speed, the minimum allowable flow is every 5 liters per minute. If coolant flow is slow, check cooling piping and fittings for accumulated rust, kinks, and restraints.
5. Check that the water temperature cannot exceed 93°C. Check the air valves on the air reservoir to make sure they are functioning properly. It is recommended that the vehicle be equipped with an automatic exhaust valve. And properly equipped with an air drying device to dry the air in front of the air reservoir.
6. When the vehicle is not using the brakes, the leakage should not exceed 6.9 kPa pressure drop per minute, and 20.7 kPa per minute when the brakes are used. If leaks are excessive, check for system leaks and repair. Check that the unloading system is working and repair it.
7. Test whether the crankcase pressure of the engine is too high, and replace or repair the ventilation equipment of the crankcase. A loose or partially lifted dipstick indicates a problem with crankcase pressure.
8. Check the engine lubrication pressure (at the oil inlet of the air compressor) and compare it with the rated pressure.
9. Replace qualified lubricating oil.
10. The air compressor can be replaced or repaired only when it is confirmed that none of the above reasons exist.
Fault phenomenon:
1. Metal impact sound:
2. Uniform percussion sound;
3. Friction whistle.
cause of issue:
1. The connecting rod bush is severely worn, the connecting rod bolt is loose, the connecting rod bushing is severely worn, and the main shaft is severely worn or damaged, resulting in impact sound;
2. The belt is too loose, and the grooves of the active and passive belts do not match, resulting in slippage and whistling;
3. The air compressor does not supply oil immediately after running, and the metal dry friction produces whistling;
4. The fixing bolts are loose;
5. The tightening gear nut is loose, resulting in excessive backlash and knocking sound;
6. There is a foreign body on the top of the piston.
Troubleshooting and troubleshooting methods:
1. Check whether the connecting rod bush, connecting rod bushing and main bush are worn, strained or burned, whether the connecting rod bolt is loose, and check whether the main oil passage of the air compressor is unobstructed; it is recommended to replace the severely worn or strained bearing and bushing Sleeve, main bush, tighten the connecting rod bolts (torque standard 35-40N.m), use the compressed air oil hole to align the air compressor oil inlet hole; air dredge the main oil passage. When reassembling, pay attention to the spindle bearings.
2. Check whether the grooves of the main and passive pulleys are the same. If they are inconsistent, please replace them and adjust the tightness of the belt (press down the belt with your thumb, and the distance between pressing the belt should be 10 mm).
3. Check the oil inlet pressure of the lubricating oil and whether the oil pipeline is damaged or blocked. If the pressure is insufficient, immediately adjust, clean and replace the failed pipeline; check the oil quality and impurity content of the lubricating oil, and compare it with the use standard. ; Check whether the air compressor is supplied with oil, if there is no oil supply, a comprehensive inspection should be carried out immediately.
4. Check whether the fixing bolts of the air compressor are loose and tighten them.
5. The gear-driven air compressor should also check whether the gears are loose or the gears are installed and matched. If the nuts are loose, tighten the nuts and replace those with problems.
6. Remove foreign bodies.
Fault phenomenon:
1. The main shaft of the belt-driven air compressor is locked.
2. The bearing bush or connecting rod bush of the gear-driven air compressor is abnormally loose.
cause of issue:
1. The lubricating oil is deteriorated or there are too many impurities.
2. Insufficient or no oil supply.
3. The displacement of the bearing bush blocks the internal oil circuit of the air compressor.
4. The bearing bush and the connecting rod bush are strained or the matching clearance is too small.
Troubleshooting and troubleshooting:
1. Check the oil quality and impurity content of the lubricating oil, and compare it with the use standard. If it exceeds the standard, it should be replaced immediately.
2. Check the lubricating oil inlet pressure of the air compressor and whether the oil pipeline is damaged or blocked. If the pressure is insufficient, immediately adjust, clean or replace the failed pipeline.
3. Check the installation position of the bearing bush. The oil hole of the bearing bush and the oil hole of the box must be aligned.
4. Check whether the bearing bush or connecting rod bush is burnt or strained. When cleaning and replacing the tiles, check whether the crankshaft diameter is damaged or worn. If it exceeds the standard, it should be replaced.
5. Check and adjust the bearing bush clearance.
Fault phenomenon: There is lubricating oil overflowing on the surface of the air compressor.
cause of issue:
1. The oil seal falls off or the oil seal is defective and leaks oil.
2. The looseness of the main shaft causes the oil seal to leak oil.
3. The joint surface is leaking, and the oil inlet and return pipe joints are loose.
4. The belt is installed too tightly, which leads to the wear of the main bush.
5. Casting or machining defects.
Troubleshooting and troubleshooting methods:
1. In the oil seal part, check whether the oil seal is cracked, and whether the inner lip is cracked or flanged. If there are any of the above conditions, it should be replaced; check whether the joint surface of the oil seal and the main shaft is scratched or defective, and those with scratches and defects should be replaced. Check whether the oil return is smooth. If the oil return is not smooth, the crankcase pressure is too high and the oil seal leaks or falls off. It is necessary to ensure that the minimum diameter of the oil return pipe is not twisted or bent, and the oil return is smooth. Check the matching dimensions of the oil seal and the box body, and replace those that do not meet the standard.
2. Move the main shaft forcefully to check whether the neck clearance is too large. If the clearance is too large, the bearing bush and oil seal should be replaced at the same time.
3. Check the sealing condition of the gaskets at each joint, repair or replace the gaskets; check the bolts of the oil inlet and return oil joints and the threads of the box and tighten them.
4. Check and re-adjust the tightness of the belt, it is advisable to press the thumb down 10mm.
5. Check for defects in the casting or processing of the box (such as whether the oil return hole at the installation of the box is unobstructed), and repair or replace the defective parts.
Fault phenomenon:
1. The exhaust temperature of the air compressor is too high.
2. The running part is hot.
cause of issue:
1. The relief valve or unloading valve does not work, resulting in no rest for the air compressor.
2. The air brake system leaks seriously and the air compressor does not rest.
3. Insufficient oil supply in the running part and pulling the cylinder.
Troubleshooting and troubleshooting methods:
1. Check the relief valve assembly when the intake air is unloaded, and clean and remove the stuck or replace the failed parts. During exhaust unloading, check that the unloading valve is blocked or stuck, and the defective parts should be cleaned and repaired or replaced.
2. Check the brake system components and pipelines. Replace faulty parts.
3. Poor lubrication between the piston and the cylinder liner, too small clearance or pulling the cylinder can lead to overheating. In this case, check, repair or replace the failed parts.
