Central Pneumatic Air Compressor Not Building Pressure

Central Pneumatic Air Compressor Not Building Pressure

You’ve been running your central pneumatic air compressor for some time, and it has been working correctly. Suddenly, you realize that its parts are running well, but it isn’t building any tank pressure. This is a common problem that you shouldn’t worry about, as we are here to help you identify the problem and provide the necessary measures to troubleshoot your unit. Anyway, what can cause a Central Pneumatic air compressor not building pressure?

There are a couple of reasons that can make your central pneumatic air compressor develop this problem. These can range from failure of the piston pump, faulty intake valve, or faulty pump gasket. If you realize this kind of issue, most probably your air compressor is leaking air. Other reasons for leakage might be the failure to close the drain valve, which makes more air drain out than the rate it pumps in. Let’s dig deeper into;

The Cause of Central Pneumatic Air Compressor Not Building Pressure. 

Gasket Failure

These are typically positioned on the upper surface of the air compressor with valve plates. They ensure the air going into the pump is controlled within the lower portion of the unit. After containing the air, it moves through the pressure valve into the tank. In case you realize the compressor is failing to build pressure, usually noticeable at the start or when it reaches an absolute pressure, the gasket can be the problem as it cannot contain air within the unit.

The air will otherwise circulate within the system but does not pass into the tank. If you realize the gasket is the problem, you should stop using the air compressor and sort for a new gasket of the right size and model for replacement.

Failure of the rings on the pump piston 

The rings on the pump piston may fail, limiting pressure build up in your air compressor. Failure of these rings will lead to subsequent leakage of air from the oil-filled lube. You should tear down your air compressor and check if there is any damage on the tank’s interior or any worn out rings. The best remedy is to replace the rounds with the right size and model rings.

Air Leakage via the Valve

If there is no problem with the above causes, there might be leakage through the intake valve. The problem might be intermittent or successive, but it remains a significant threat to your entire system.

In this scenario, open up your air compressor and try to blow in air through both ends. The air should easily pass if you blow from the intake port, but you should not realize any air passage if you blow through the exhaust port. In case air comes through both ends easily, the intake valve is the problem, and replacing it with the right model is the ideal solution.

If the above three cases do not solve your problem, consider taking it to a technician. But first, perform the above troubleshooting techniques before wasting your cash elsewhere.

Troubleshooting Guidelines to ensure your Central Pneumatic air Compressor Builds Enough Pressure

Industrial air compressors need pressure maintenance at approximately 120 PSI for effective operation. Adjust the air compressor to the right pressure for powering other tools. Note that a 2 PSI increase in pressure demands a 1% total input power. Failure to deliver the correct air pressure means no task. Furthermore, if there is an inadequate supply of pressure, the air compressor takes a long to run, making it shut down due to overheating. Remember that a bad Ac compressor can cause car to overheat. Many other consequences entail usage of more oil leading to more expenditure and performance inefficiencies. For effective running of your unit by maintaining operational pressure to an appropriate level, I may advise you to perform the following troubleshooting measures routinely:

Perform a Pump up Test

The test is necessary to determine the period it takes your pump to build enough pressure. It involves the following steps: First, drain the air tank, close the discharge valve, and ensure the PSI is zero (0). Proceed by noting the time it takes the unit to build enough pressure. Confirm with the cut-off pressure detailed in the operator manual. If the two coincide, you are good to go. Remember, the cut-off pressure varies with the model of the air compressor.

Ensure Your Filters are Always Clean

Tear down your air compressor and check the air inlet filter. Air contains a lot of particles or debris which get trapped as it is forced through the unit. It is your routine duty to check and clean the filter to ensure the smooth passage of air. It would be best if you also replaced the filters regularly as recommended by your dealer.

Screen for Any Leakage as you Assess Air Demand

Leakages are significant inhibitors to an air compressor’s performance as it leads to a loss of averagely 30 to 50 percent of the total compressed air. Ensure you adjust the unit’s pressure to the appropriate level and check for any leakages. First, make sure the fittings are tightened and if in case the leakage is from the tank, get a new replacement.

Check all the System Valves

The valves are a potential weak point for any leakage from the system. Therefore, you should examine the valves thoroughly. For no exit of air from the tank, ensure the drain valve is tightly sealed. The next step is to make sure the inlet valve opens for air entry. Oil-level should also be to a certain level as more oil on the carryover prevent the unit from building enough pressure. Another valve that requires checking is the safety valve. Make sure it is not leaking. The safety valve helps release excess air if the switch fails to stop the air compressor at the cut-off pressure reading. You should replace the valve with the right model if it has any issues.

Examine Your Oil/Air Separator

The oil/air separator is another area that should be given a closer look during routine maintenance. The separator successfully differentiates the oil from the air, thus ensuring enough pressure build up in the tank. Replace a foul separator as soon as possible as it prevents the pump from reaching the cut-off pressure limit.

Assess Belt Condition

The belt might be the reason for failure to build enough pressure if a belt drives your air compressor. To assess your belt system, switch off the machine and disconnect the power. Uncover the back section of the guard, tighten the belt if it is loose, or replace it if altogether unfit. To install a new belt, push the motor towards the pump, unleash the belt from the pulley gently, install the new belt, and slide the motor back to its original position. Tighten the bolts as you adjust the belt tension as required. Put back the guard. Here is our article on how big a pulley should you use in your gas air compressor. 

Inspect Pump Rings

The rings work by sealing the air within the cylinders. Moreover, the rings limit excess oil from moving downstream. Through these functions, the rings ensure enough pressure build-up within the cylinders. Failure or worn out pump rings will not contain air leakages, thus reducing the tank’s pressure limit. The necessary action is to replace the rings or the whole pump. If you have any other issue that is limiting pressure build up in the pump, kindly reach out to your dealer.

How to Fix Air Compressor Not Building Pressure Video

Final Thought

It would be best if you were extra observant and careful when your central pneumatic air compressor is not building up enough pressure. The problem can lead to the destruction of your air compressor due to overheating. Therefore, if you realize an issue with your air compressor failing to build pressure, stop operating it immediately and perform the troubleshooting measures in this article.

I wish you all the best as you work with your central pneumatic air compressor. For additional information on air compressor fix, central pneumatic helps a lot.