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How to Fix an Air Compressor That Doesn't Build

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  • If you are asking is it possible to repair a leaky air compressor tank the answer is no, not without risk of life or death. When the pressure builds great enough, what ever has plugged that hole, will blow out and it will hurt of kill whoever that plug happens to hit.
Regards, Tony

Posted on May 22, 2011

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Posted on Jan 02, 2017

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I have a husky scout 1.5 gallon air compressor. It only builds pressure to about 38 psi. It doesn't build up any more pressure.


You have either warped or broken reed valves on the valve plate or a broken piston ring and/or a damaged cylinder. Any of these will allow a small amount of air compression but as the tank gets pressure in it, it gets harder to push more air into it. If the reed valves or piston to cylinder seal is compromised more and more air will leak past the bad reed or the piston as the pressure goes up in the tank. You'll have to disassemble the air pump to find out what's damaged and needs replacing.

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When compressor gets to proper pressure and starts to kick down, it stalls


when the pressure reaches its max (abt 130psi)the unloader valve
slows down the speed of the compressor and relieves backpressure
on the pump.The carb has two idle speed screws. one is high speed
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My coleman air compressor won't turn on and I am trying to ghet the top off to see what the problem is. A) How do I get the top off? and B) Why doesn't it turn on?


Hi
Sound like your pressure switch is faulty or maybe a faulty motor but:

Here are a few things to check, you may have already checked some of these.

Electricity...Compressors will run best with full 115Vot 15AMP/Or 220V electrical supply from a circuit, over the shortest electrical cord as possible.

Air Leaks..Place your ear close to the compressor and listen for air leaking, if you hear air that is not normal and means you have to locate and repair whatever it is that is leaking.
Check the air unloader valve... The air unloader valve will blown out air when you turned off the compressor, that is normal.
But it should not have air leaking out of it all of the time. If so then it is faulty and in need of repair/replacement.

Valves...If either the intake or exaust valves fail, breaks, or fails to seat, then your compressor will run 24 hours a day and never build up to the correct pressure for shut-off.

Gaskets...Check to see if your gaskets have failed.
You could have a gasket failure between the pistons and you will never know it because it shows no external air leak.
If this situation happens then the air will only cycle between cylinders and never build up the correct air pressure.
One way to check the gasket is remove the air filter, then put your hand over the intake.
If correct then it will **** you hand against the intake.
If the valve or valves have failed then you will feel the air sucking in and blowing out.

Piston Rings and Cylinder...The piston rings could be stuck,broken, or worn and not allowing the correct pressure to build up in your tank.
A worn cylinder will also contribute to the problem of pressure build-up.

Pressure Switch...Check for air leaks at the pressure switch, it has a rubber diaphram that can fail and leak air out of the system.
Please take time to rate me

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