Question about Campbell Hausfeld Single Stage Air Compressor. Single Stage Cast Iron Compressortwin Cylinder Vt Pump with Flywheel

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Unloader valve leaks on my compressor leaks air constant and I think that it must need replacing, does it? just old or what?

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  • Greg Bernett
    Greg Bernett May 11, 2010

    How old is your compressor?

  • Anonymous Mar 26, 2014

    My pump is an Armstrong Astro 31 about 15 years old

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THE VALVE COULD BE BAD BUT IT MORE LIKELY THE CHECK VALVE IN THE TANK ISNT CLOSING. DRAIN PRESSURE AND REMOVE CHECK VALVE FROM THE TANK AND INSPECT.

Posted on Mar 14, 2009

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Posted on Jan 02, 2017

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How can i fix my ec12 hitachi electric air compressor


This problem is caused by either the starter capacitor or the in-tank check valve. Ez to check. With no air in tank, start compressor; if motor hums or has difficulty suspect capacitor. If motor starts, partially fill tank and unplug the power. Check for air leaking at the pressure switch or air coming out of the air inlet (remove the air filter). If air leaking, replace check valve. If no air leaking, again let out all the from the tank and connect power. Allow the compressor to fill and shut-off. After the compressor fills, again listen for air leaking from the pressure switch unloader valve. If air continues to leak from unloader, replace the check valve. Good luck

Jun 11, 2015 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Starts a little slow but does run up to pressure. , but will not restart when the pressure drops to the point where it should s5tart. It just hummmmmmmmm's. Any Ideas or do I need a new one?


This problem usually occurs when the in-tank check valve is leaking air back to the pump and the unloader is not working properly. Follow air discharge line from the compressor to the tank. This line is attached to the check valve (usually brass or chrome). A second smaller line also attaches to the checkvalve and leads to the pressure switch (unloader valve). After filling and shut off, you should hear a discharge of air at the pressure switch. If not, examine valve for possible mis-alignment with contact arm. If air continues to leak from the unloader valve, then checkvalve is leaking. Use universal replacement check valve if possible, check thread size. Parts are on ebay or www.toolpartsdirect.com. Good luck

Apr 08, 2011 | Campbell Hausfeld 04 Gallon Twin Stack...

1 Answer

My compressor builds to 125 psi then shuts off like it should then when the pressure is released the compressor wont start back up. Sometimes it will attempt to start and it sounds like the motor is...


When a compressor reaches set pressure, there should be a release of air from discharge hose thru the unloader. This release of air unloads the compressor head pressure. The unloader is usually located within the pressure switch. Easy to check. Follow discharge hose from compressor head to tank. There should be a brass/steel checkvalve at the tank. The checkvalve allows air to enter tank, however not allow air to be released back into discharge hose. If this valve is leaking, air will be released from the unloader constantly. Follow 1/4" tubing from checkvalve to unloader and listen for leaks. Repair as needed. If air is not leaking from checkvalve then check unloader mechanism with-in pressure switch. Parts are available at www.toolpartsdirect.com Good luck

Aug 25, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

2.5hp 40ltr unloader prob?


Motor stalling during the fill cycle would indicate problems with the intank check valve, weak capacitor or low power to compressor. The unloader generally opens only when compressor reaches set pressure. Easy test. Unplug compressor with air in tank and remove the small airline at the checkvalve (brass valve in tank). Listen for air leak. Checkvalve is ok if no leak at brass valve. Test capacitor for 95% rated value. Replace as needed or test for low power. Good luck.

Jul 30, 2010 | Craftsman Air Tools & Compressors

1 Answer

I have a Bostitch CAP2000P-OF 6 gal compressor. When the pressure switch cycles off, the compressor bleeds off air till the pressure switch cycles on then it stops. It repeats this cycle constantly. It...


Something is wrong with your "unloader" I should think. That is the device that removes the pressure from the cylinder so the machine does not have to start up against its full air pressure
There will be a narrow air pipe connecting the compressor to the switch assembly which bleeds off the air when the power is off. That hiss you get when you turn it off or it turns itself off.
I think you will find a leak there or possibly the non return valve that stops all the air escaping when the unloader valve is open has failed or got a foreign body stuck in its seating.

May 31, 2010 | Stanley NEW Bostitch 2 HP 6 Gallon...

1 Answer

25 gal horizontal craftsman air compressor is leaking at the pressure control valve. Can I replace the valve or repair it?


Unloader valve probably needs to be adjusted. Should be two jam nuts holding the unloader to the pressure switch. Loosen the jam nuts and adjust the unloader slightly away from the lever. Tighten the jam nuts and try it again.

May 21, 2010 | Air Tools & Compressors

1 Answer

Air compressor leaking air


you have a bad check valve ,the little brass valve is working normal

Apr 18, 2010 | Clarke Power Products AC2002A 2 Hp Air...

1 Answer

Coleman Powermate Model Number BV6548049, pressure switch leak.


Usually, a leak at the pressure switch unloader valve is caused by the checkvalve in the tank. The unloader valve at the pressure switch bleeds out the air from discharge tube after compressor reaches set pressure. This only takes a few seconds. If air continues to leak then air is leaking back into the discharge tube past the tank checkvalve. Follow the air discharge line from the compressor to the brass valve at the tank. The brass valve is the checkvalve that holds the pressure in the tank. There are usually two connections at this valve. One is the unloader tube to the pressure switch. Simple test for leaking checkvalve, with pressure in tank unplug or switch off the compressor and remove the small unloader line at the checkvalve(brass valve) and look/listen for leak. If leaking, remove the checkvalve and examine seat/check for debris keeping the valve slightly open. If it cannot be cleaned, order generic replacement from www.grainger.com. It will cost less than the factory checkvalve. Just pay attention to the thread sizes for easy fit. Good Luck on your repair and email if you have questions.

Mar 25, 2009 | Coleman Powermate 60 Gallon Air Compressor

1 Answer

Makita MAC2200 runs fine (with new Manifold Switch and repaired power cord) but there is an air leak under the new manifold switch that seems to be a feature of the switch. When set to automatic, the...


I have worked on many makita compressors and have run-across this problem on a few of them. Your compressor has a check valve that is supposed to hold tank pressure after the switch reaches set pressure. There is an unloader valve built into the pressure switch that releases the pressure in the discharge hose after the unit shuts off. The unloader allows the compressor to restart with-out any pressure in the discharge line. If the brass check valve is leaking pressure back into the system, air will leak out of the unloader valve. Follow the discharge line to the tank and you will see the brass check valve. To test valve for fault, run the compressor till it builds around 80 psi and unplug the unit from the wall outlet. Remove the 1/4" hose connector from the check valve and check for air leaking out of the valve. If it is leaking you can order form www.toolpartsdirect.com. or call the makita 1-800 number. The price is about the same. Good Luck on your repair.

Mar 18, 2009 | Makita Air Tools & Compressors

1 Answer

Ingersoll rand air compressor 185


How old is the compressor ? This trouble shooting is directed to the vane and screw types of air compressors.

Caution,
For exact information on the equipment you are working on, go to the manufacturer’s maintenance and repair manual.

Here are some possibilities.

Compressor does not reach design pressure or capacity:
Air Pressure safety valve is leaking
Receiver air valve is open
Unloader valve is leaking
Loose Piping or fittings

Compressor will not load or unload:
Unloader valve defective
Air control valve is sticking or dirty
Unloader pressure is improperly set too high or too low
Water in the control lines
Plugged control lines

The air compressor CFPM is low:
Dirty air compressor air filter
Defective air intake control valve
High idle on power source improperly set
Damaged or worn rotor blades

Nov 23, 2008 | Air Tools & Compressors

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