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I have a viair 400c compressor. It will build up to 40psi and then nothing after that, i've check for leaks and replaced the check valve, any other suggestions?

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  • 36 Answers

Per the manual you might want to check the air filter element. The manual with some very basic troubleshooting matrix can be found at this link http://www.viaircorp.com/images/manuals/325C_350C_400C_450C_Manual.pdf

Posted on May 12, 2014

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SOURCE: Air compressor leak

If this hole looks factory drilled thats what the valve is for and is weak and needs to be replaced if someone has drilled it into the valve it will still need to be replaced

Posted on Oct 07, 2008

  • 1388 Answers

SOURCE: Compressor is building up pressure very slow.

It could very well be the valve plate however before you order parts take a look at the cylinders. Unplug the unit, remove the cover from crank side and turn the compressor by hand till the/a piston is at top of stroke. Examine upper cylinder for scratches /wear or failed vinyl piston ring. On oil-free compressors, dirt and grit is sucked-in from the bottom of the cylinder and causes leaks between cylinder wall and piston. If scratched, air pressure is leaking down thru cylinder wall. Failed reed valves cause a pulsation at the intake port (air seems to be pumped out the intake). If you see a model number anywhere on the pump that begins with " WL", your pump is made by Campbell Hausfeld. Parts can be ordered from www.chpower.com. other-wise order parts from sears parts. Cylinder kits are around $40. Good Luck on the repair and email if you have questions.

Posted on Apr 02, 2009

  • 7 Answers

SOURCE: I have a Husky model Y6010 air compressor.

First remove the valve using probably about a 1/2" wrench but make sure there is no pressure in the tank before you do so. check the cone and seal by loosening the valve by hand and check for debris. If there is no debris then the problem is either the pressure relief valve or weak pressure regulator but may also be a bad piston seal if it is a direct drive unit.

Posted on May 02, 2009

  • 1388 Answers

SOURCE: Dewalt 4 gal air compressor will not build pressure in take.

The bleed valve is an unloader of sorts that allows the compressor to start with-out a load. It closes when the pressure in the airline reaches about 20-25lbs with good volume. If air volume is not sufficient, the valve will not close. To solve the problem lets do a few tests. A long cord will reduce power and reduce air volume. Try powering the compressor with-out extension cord. If bleed valve closes when you do not use a cord, the compressor is not getting enough voltage, use shorter cord of the 12 gauge quality and more hose to reach work. If valve still does not close, check for air leaks on all fittings including around pressure switch and drain valve with soapy water. Repair as necessary and retest. If no leaks were found, temporarily plug bleed valve port with screw/bolt and run compressor till set pressure cut-off while counting minuites/seconds. The compressor should fill and shut off within three minutes or so. If it takes an unusually long time to fill, then the reed valves /valve plate is worn and leaking pressure back into cylinger. Leaking valves will usually result in very hot discharge airline/air. Reinstall the bleed valve after test. Parts and partslist are available at www.toolpartsdirect.com . Good luck on the repair and email if you have other questions.

Posted on May 06, 2009

  • 1 Answer

SOURCE: hi just found this site trying to remedy a

My compressor would only build 40psi, the motor would run and run. It turned out to be the head gasket. The portion of the gasket
that separates the intake side from the exhaust side had failed.
If air is blowing out of your air filter (instead of there being a suction) than this is most likely the cause.

Posted on Jul 14, 2009

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1 Answer

The air pressure won't go above 40psi on my Husky Y1010. Read suggestions it might be a broken reed valve. How do I fix that?


Hi Joanne

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 suck 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.
Bud

Oct 16, 2013 | Air Tools & Compressors

2 Answers

Pump is not shutting off, and pressure not building up


Hi Kendal

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
Bud

Nov 01, 2012 | Campbell Hausfeld 26 - Gallon Air...

1 Answer

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


Hi,
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..

heatman101

Jul 26, 2011 | Garden

1 Answer

I have a model# 919166442 air compressor that all at once quit building air pressure. when it gets to 40psi the engine keeps running but air pressure wont rise


There is a check valve that has gone bad,this allows air into the tank,and does not allow the air to go back toward the compressors head.This can also cause the compressor to lock up.

May 17, 2011 | Craftsman 15 gal Air Compressor 3 hp UMC...

1 Answer

Only builds up to 40psi


I am assuming you have check for line leaks, both on the compressor and your line out of the tank and the valve on the bottom of the tank is closed. This is usually a sign your valve plate is damaged, most likely a broken reed valve. If it's an oilless compressor it could be the wiper on the piston. Without knowing the model number all I can suggest is take the head plate off and check the valve plate. If all of the reeds are in place and not broken or cracked you'll have to check the piston.

Oct 28, 2010 | Campbell Hausfeld 5.0 Hp Cast Iron Air...

1 Answer

Our porter cable compressor model #c2000 wik is set to reach 40psi. The compressor will run but will only reach approximately 10 - 15psi. We would like to determine which componet needs to be replace or a...


Your compressor will not build pressure if there is a leak or the cylinder/packing is worn. Easy tests. Use soapy water on all fittings including drain valve while compressor is running. If no leaks, remove covers and secure motor to tank. Run compressor using soapy water on all fittings and repair as needed. If no leaks are found, unplug compressor and turn belt by hand untill piston is full top of stroke and examine cylinder with flashlight for scratches. If you see scratches close to the top of the cylinder, replace cylinder and ring to restore pressure. If cylinder looks smooth most likely valve plate in head has broken reed valves. Parts are available at www.toolpartsdirect.com or your local Dewalt service center. Good luck with your repair and post again if you have other question.

Jul 30, 2010 | Air Tools & Compressors

1 Answer

Air Compressor stalls when it reaches @ 40psi. Have a


You need to find an amp probe from someone and use it to monitor the amps as the compressor is building up pressure. If the amps start increasing dramatically as it nears the stall point it would seem that you have a seizing problem or electrical motor problem. This answer only applies to the exact statement that you gave. ( Air Compressor stalls when it ). Mike micmor68@gmail.com

Oct 25, 2009 | Air Tools & Compressors

2 Answers

Craftsman compressor


these small compressors do not have a long life especialy if they are run for more than 15 min /hour , bet no body told you that when you bought it the ones with an iron barrel are better so to problem
1 piston rings worn or broken / replace
2 daft i know but air leaks/ when it is running you carn't hear a leak cos of the running noise,run it up as high as it will go switch off and listen /repair leak
3 sticking or passing valves , these are located in the cyl head /take filter unit off,run it when it comes up to 40 psi put your hand close to the inlet port if the inlet valve is passing you will feel a sort of chuff chuff on your hand ,switch it off ,if you can hear ,and feel air coming out of the inlet port the Exaust valve is leaking ,sadly these small comps are difficult and bloody expensive to get spares for"they want you to buy another one " so depending on the amount of use it has had it might not be woth while repairing hope this has been of some help
merlin v12

Aug 17, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Ec12 hitachi air compressor will not build pressure higher than 40psi


most likely the the reed valves are stuck or miss aligned. Worse case senerio your piston seal blew causing this not to build pressure. Read manual on how to disassemble head. to remove should be 4 bolts and your copper line, just be careful of the reed valve plates, they are thin steel that sit into the head. Put back the same way you took it apart.

Feb 28, 2009 | Hitachi EC12 Portable Electric 2hp Air...

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