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How to rebuild the pressure switch on air compressor

Posted by Anonymous on

6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Air leakage through pressure switch needle

1)Let your unit pump up.
2)Turn it off.
3)Find the supply line from the pump to the tank.
4)Remove the supply line from the pump head.
5a)If you hear air coming from the tank you have a bad check valve.
5b)If you do not hear air coming from the tank, you have a leaky
pressure switch.

Posted on Feb 02, 2009

SOURCE: air compressor - pressure problem

'When the machine is shut off, disconnect the discharge line out of the head of the compressor. If air releases, replace discharge check valve in tank.

Posted on Mar 30, 2009

  • 141 Answers

SOURCE: I have a Porter Cable

I believe you have a head valve or piston ring problem. The parts you replace are suppose to leak. It is a safety feature that doesn't allow the motor to burn up before the pump warms up. Kind of like a soft start feature. If you look on the breakdown part number 107 Kit Valve Plate is what you need to inspect. Sounds like your valve plate is either worn or damaged. If you go into the pump you will have to get part 103 also which is a gasket kit. Or you can try to salvage the old gaskets.
If the valve plate is ok you will need to inspect the rings that go around the pistons. Some times you will get one that gets brittle and breaks off scarring the cylinder. Look for these two things, I am pretty sure one of them is the problem with your compressor.

Posted on Sep 08, 2009

  • 205 Answers

SOURCE: i have a 19.2 pse northstar air compressor with a

there should be a gasket and up read valev and plate kit for that pump. call nothstar

Posted on Oct 14, 2009

  • 54 Answers


STOP! Your pressure switch is doing what it is supposed to, but the tank check valve is leaking. This valve is usually at the tank where the line from the compressor head enters the tank. The small tube line from the pressure switch probably also goes to this valve. You'll need to clean or replace it.

Posted on Nov 17, 2009

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My air compressor turned on and built up pressure earlier. It cycled off when psi was it won't come back on and rebuild the pressure.


I think It falls back to the sensitivity of your pressure on/off switch.
This is a friendly thought, and may be the seat of your problem


Aug 03, 2011 | Air Tools & Compressors

1 Answer

125 psi sears air compressor only goes up to 40psi and will not stop running I've replaced pressure switch and manifold.

If the unit will only pump to 40 psi. then here are a few things I would check...

Check the air filter to make sure it is clean so air can be pulled in easily...
Check the relief valve to make sure that it has not gone bad and is releasing the air pressure or leaking at 40 psi...
Make sure the any hoses or nozzles are tight and not leaking...

If all of this checks out then the compressor has an internal problem such as bad rings or valves that will keep it from pumping to a higher pressure...
The pump will need to be torn apart to find the exact cause of the problem... and many times the correct replacement parts will not be available to rebuild those compressors..


Jul 26, 2011 | Garden

1 Answer

What would cause load unload sump pressure?

Is this a rotary screw unit? Was it low unloaded sump pressure? If so the most probable cause is the minimum pressure check valve located under the aluminum cap on the seperater tank (oil tank). The check valve piston binds in the housing due to rust, dirt,etc. If you are going to attempt the repair your self I would recommend purchasing rebuild kit before disassembly.
If this problem is with a 2475 unit I would look at the pressure switch. If you are saying the unit starts/stops/starts etc and it is equiped with a low oil level switch the oil level is low. fill it to the oil fill plug threads.

Mar 03, 2011 | Ingersoll Rand Type 30 Fully Packaged Ir...

1 Answer

Hitachi EC 12 2hp Air Compressor. Just get a buzz sound when plugged directly into 120v wall outlet. Piston and shaft turn freely. Have installed a new pressure switch. Just turned the compressor on...

Hitachi EC12 Air Compressor Parts : MASTERTOOLREPAIR.COM

Here is a site that says:
1. Are the capacitors good? (They get the motor going).
2. If they are, replace the stator, ($245)

If you don't find a good solution there, I would try taking it to a local motor rebuilder.

Dec 14, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

1.5 hp small portable air compressor won't pump up above 22# or so....keeps running but won't increase pressure.

The rings are probably done for. You could rebuild it if you are handy. Get a rebuild kit from Sears. Compare the price of a new one to the price of the kit and your time.

Dec 28, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Husky Q26 will not build pressure. Where do I buy parts?

First check the check valve and also if it has an unloader valve make sure it is closing.

The main check valve is often right where the air goes into the tank. The unloader can be integral to the pressure switch or on the compressor.

Sep 26, 2009 | Air Tools & Compressors

1 Answer

Porter cable compressor will not restart once it is under pressur

This is likely a bad check valve which is allowing pressure from the tank to leak thru back to the compressor. The compressor won't start because the compressor cylinder has air pressure on it.

The check valve is about the size and shape of a .410 shotgun shell -- it's in the copper line from the compressor to the tank.

May 27, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Air Compressor, low pressure

does the compressor keep running all the time but never gets above 40 or does it turn off at 40?
if it is turning off at 40 I would try using another gauge just to be sure it is 40psi, and if that is the case then you probably have a faulty pressure switch, if the compressor is constantly runnign but won't get past the 40psi then you may have a worn out compressor, check the oil for either a low level or if the oil is dirty, if it is you may just need to drain and refill but if that doesn't fix the issue then you will need to rebuild the compressor

Oct 11, 2008 | Air Tools & Compressors

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